This webinar was presented by Jill Johnston on Oct 28, 2010. For more information about this webinar, visit the Alaska Fire Science Consortium website at http://akfireconsortium.uaf.edu
David Lindenmayer_LTERN and the conservation and management of temperate euca...TERN Australia
This document discusses research on the conservation and management of temperate eucalypt woodlands in Australia. It describes several long-term research studies monitoring plants, animals, and vegetation structure in woodland plots. Key findings include increased detection rates of some woodland bird species over the past decade, the importance of replanted and regrowth woodlands for biodiversity, and improvements to vegetation and birds from interventions like grazing control. The document advocates for conservation initiatives on private lands, incentives to prevent clearing, controlling damaging grazing, and continued restoration funding to benefit biodiversity in temperate woodlands.
Fire Intensity Effects on Coastal Redwood RegenerationAxël Eaton
This study examined the relationship between fire severity and basal sprouting in coastal redwood trees in Big Creek Reserve, California. The researchers measured 112 redwood trees and classified burn severity. They found coastal redwoods produced more basal sprouts with increasing burn severity, as measured by char height and the presence of goosepens. Even after accounting for tree size, higher burn severity was correlated with greater sprouting. This response may be due to increased light availability or redirection of nutrients after severe burning. The findings suggest forest management could use controlled burning to reduce fuels while stimulating redwood regeneration to conserve the species in the face of climate change.
Tree regeneration, Fenner School July 2009joernfischer
The document summarizes research on tree regeneration in Australia's temperate grazing zone. It finds that under current grazing practices, trees are not regenerating at most sites due to lack of seedlings. If practices do not change, millions of hectares currently supporting tens of millions of trees could become treeless. The research identifies grazing regime, tree density, and soil nutrients as factors influencing regeneration, finding that ungrazed areas and fast livestock rotation support more regeneration than continuous grazing.
This document summarizes research on the effects of fire on fauna habitat. It finds that:
1) Logs and bark are important habitat for many species but are consumed by fire, reducing their quality and time to recover.
2) Invertebrate numbers were over double under unburnt logs and bark compared to burnt.
3) Burning removes shrub layers and litter instantly, and the amount of logs, hollows, and fuel takes 50+ years to recover to pre-fire levels.
Assessing the Impact of Blister Rust Infected Whitebark Pine in the Alpine Treelines of Glacier National Park and the Beartooth Plateau, U.S.A. Presented by Emily Smith-Mckenna at the "Perth II: Global Change and the World's Mountains" conference in Perth, Scotland in September 2010.
Factors to Consider When Planning a Prescribed Burn for WildlifeClaude Jenkins
The document discusses factors to consider when planning prescribed burns for wildlife habitat management. It states that prescribed burns should be based on landowner goals, site conditions, and wildlife requirements rather than general rules of thumb. It identifies scale, season, and frequency of burns as important considerations that depend on the target wildlife species and environmental conditions. The document emphasizes that prescribed burn plans need flexibility to adapt based on whether the desired habitat outcomes are being achieved.
David Lindenmayer_LTERN and the conservation and management of temperate euca...TERN Australia
This document discusses research on the conservation and management of temperate eucalypt woodlands in Australia. It describes several long-term research studies monitoring plants, animals, and vegetation structure in woodland plots. Key findings include increased detection rates of some woodland bird species over the past decade, the importance of replanted and regrowth woodlands for biodiversity, and improvements to vegetation and birds from interventions like grazing control. The document advocates for conservation initiatives on private lands, incentives to prevent clearing, controlling damaging grazing, and continued restoration funding to benefit biodiversity in temperate woodlands.
Fire Intensity Effects on Coastal Redwood RegenerationAxël Eaton
This study examined the relationship between fire severity and basal sprouting in coastal redwood trees in Big Creek Reserve, California. The researchers measured 112 redwood trees and classified burn severity. They found coastal redwoods produced more basal sprouts with increasing burn severity, as measured by char height and the presence of goosepens. Even after accounting for tree size, higher burn severity was correlated with greater sprouting. This response may be due to increased light availability or redirection of nutrients after severe burning. The findings suggest forest management could use controlled burning to reduce fuels while stimulating redwood regeneration to conserve the species in the face of climate change.
Tree regeneration, Fenner School July 2009joernfischer
The document summarizes research on tree regeneration in Australia's temperate grazing zone. It finds that under current grazing practices, trees are not regenerating at most sites due to lack of seedlings. If practices do not change, millions of hectares currently supporting tens of millions of trees could become treeless. The research identifies grazing regime, tree density, and soil nutrients as factors influencing regeneration, finding that ungrazed areas and fast livestock rotation support more regeneration than continuous grazing.
This document summarizes research on the effects of fire on fauna habitat. It finds that:
1) Logs and bark are important habitat for many species but are consumed by fire, reducing their quality and time to recover.
2) Invertebrate numbers were over double under unburnt logs and bark compared to burnt.
3) Burning removes shrub layers and litter instantly, and the amount of logs, hollows, and fuel takes 50+ years to recover to pre-fire levels.
Assessing the Impact of Blister Rust Infected Whitebark Pine in the Alpine Treelines of Glacier National Park and the Beartooth Plateau, U.S.A. Presented by Emily Smith-Mckenna at the "Perth II: Global Change and the World's Mountains" conference in Perth, Scotland in September 2010.
Factors to Consider When Planning a Prescribed Burn for WildlifeClaude Jenkins
The document discusses factors to consider when planning prescribed burns for wildlife habitat management. It states that prescribed burns should be based on landowner goals, site conditions, and wildlife requirements rather than general rules of thumb. It identifies scale, season, and frequency of burns as important considerations that depend on the target wildlife species and environmental conditions. The document emphasizes that prescribed burn plans need flexibility to adapt based on whether the desired habitat outcomes are being achieved.
1. The document discusses growing native trees that can thrive for 300 years by planting locally native species and accounting for substantial environmental changes expected from climate change and new pests/pathogens.
2. Resilience measures are needed to cover several centuries since current approaches can't be tested or targeted under high uncertainty about impacts.
3. Greater tree diversity is suggested, including non-local genotypes, replacement species, and pre-emptive diversification with analogue species to improve resilience of forests over centuries.
Beckel - Leaf physiology response across a disturbance gradient in a temperat...Rick Beckel
This document summarizes a study that examined the photosynthetic efficiency of sapling trees across four common species in a disturbed northern Michigan forest. Light response curves and measurements of apparent quantum yield and maximum photosynthetic rate (Amax) were taken for 117 saplings across a disturbance gradient caused by girdling over 6700 trees. Amax was found to significantly increase over the disturbance gradient for red oak and American beech saplings. This suggests these species have a strong capacity to take advantage of canopy gaps, which may impact future forest composition. The physiological responses observed could help refine parameters in earth systems models regarding forest response to disturbance.
Fire can be used for ecosystem maintenance, by triggering normal successional processes, or restoration, to repair degradation and reinstate conditions to enable recovery. Maintenance uses fire to avoid excessive senescence, while restoration uses fire to revive declining diversity, reduce fire-sensitive species, and trigger recovery. Shifting a site to alternative fire-sensitive vegetation is a last resort that should only be considered under specific conditions. Cultural burning can also restore cultural practices and landscapes when combined with ecological restoration goals.
This honors thesis studied how plant seed traits mediate changes in plant communities in Wisconsin's unburned prairies. The study tested hypotheses about differences in seed traits between burned and unburned prairie sites. Seed mass, coat thickness, and shape index were measured for species at different sites. Results showed unburned sites had higher average seed mass than burned sites, and a strong negative correlation between seed shape and mass. While some relationships between traits and fire history were found, fire was the main driver of community composition. The implications are that a lack of fires since the 1950s has influenced prairie makeup, and prescribed burns should be more widely used as a management tool.
Continuous Cover Forestry: an alternative model for the sustainable managemen...Edward Wilson
This paper was presented at the Institute of Fisheries Management 7th Specialist Conference, on the theme "Forestry and Fisheries - Where Next?". The event took place at Rheged, Penrith, Cumbria, England on 21-23 April 2015.
The presentation provides an overview of the principles of Continuous Cover Forestry and its application to woodlands in Britain. In addition, information is provided on the opportunities and challenges associated with continuous cover forestry in wooded watersheds and catchments. There is a need for more case studies and long-term study of forest development and environmental interactions in watersheds.
Seminar by Etienne Laliberté about his research program on edaphic drivers of plant diversity, and presentation of the Canadian Airborne Biodiversity Observatory (CABO)
This presentation by Roger Lembit of Gingra Ecological Surveys highlights the role of long term monitoring of fire impacts and plant response in guiding restoration strategies by discussing vegetation recovery at the State Mine Fire site.
Presentation from Nature Conservation Council of NSW 2015 Bushfire Conference - Fire and Restoration: working with fire for healthy land
This document provides background information on longleaf pine ecosystems and describes a study conducted at Oak Mountain State Park in Alabama. It discusses how longleaf pine ecosystems used to dominate the southeastern US but were largely destroyed by logging and fire suppression. The study aimed to better understand montane longleaf pine ecosystems by examining relationships between environmental variables, juvenile pine abundance, and adult pine basal area across foothill and mountain slope sites. It hypothesized that variables like decreased soil depth and increased slope or tree competition would negatively impact pine recruitment and growth. The document outlines the environmental variables measured, including canopy openness, slope, and soil depth.
This document summarizes research on cushion plants in the Hudson Bay Lowlands and their potential role in facilitating other plant and insect species. Cushion plants can provide shade, moderate temperatures and moisture levels, and protect other plants from wind and herbivores. The researcher aims to study whether alpine blueberry cushion plants facilitate other species, including tree seedlings, and whether this facilitation increases under more stressful environmental conditions. Data will be collected on plant diversity, seedling growth, insect visits, temperature, light, moisture and nutrients across sites that vary in elevation and disturbance level. Results will provide insights into how facilitation may help plant communities adapt to global environmental changes.
2011 year 8 geography - rainforests - vegetationdjgraygray
Rainforests have many unique types of vegetation that have adapted to the dense, humid environment. Lianas twist around trees in search of sunlight, while buttress roots support trees in the shallow soil. Epiphytes live on trees without contacting the ground, and strangler figs, ferns, mosses, and saprophytes also thrive in the rainforest.
1) There was a positive relationship between local and regional plant species richness in tallgrass prairie, but this relationship varied with grazing, topography, and fire frequency.
2) Experimental removal of the dominant grass Andropogon scoparius resulted in a significant increase in local species richness compared to reference plots.
3) Overall species richness was higher in grazed areas compared to ungrazed areas, but grazing did not significantly affect the relationship between number of sites occupied and average abundance across the landscape.
2011 year 8 geography - rainforests - geographic processesdjgraygray
The document discusses the complex ecosystem of rainforests, which features interactions between climate, landforms, soils, plants, and animals, with each component impacting the entire system. Key atmospheric and hydrologic processes that support rainforests are warm temperatures year-round and regular heavy rainfall. The balance of nutrients in rainforest soil and atmosphere is maintained through processes like photosynthesis, nutrient recycling, and leaching of nutrients into subsoil layers.
2011 year 8 geography - rainforests - layersdjgraygray
The rainforest has four main layers:
1) The emergent layer contains the tallest trees that tower 40-60m above the forest floor and receive plenty of sunlight.
2) The canopy layer forms a covering 25-45m high and maintains a moist environment, containing many flowers and fruits.
3) The understory receives only 2-5% of sunlight and contains smaller trees and plants like ferns.
4) The forest floor is thick with decaying material and provides rich nutrients for growth, but also competition between plants.
This document discusses how increased plant biodiversity in grasslands leads to greater ecosystem stability and productivity. It defines key terms like ecosystem, ecosystem services, biodiversity, and describes the diversity-stability hypothesis which proposes that more diverse ecosystems are more resilient to environmental disturbances as they are more likely to contain species that can thrive during perturbations. The document presents results from a study of 207 grassland plots showing that more species-rich plots had greater drought resistance, producing half the biomass loss during droughts, supporting the hypothesis. Maintaining biodiversity is important for grassland ecosystem stability.
Seminário 4 egerton-warburton_et_al-2000-ecological_applications_mycorrhiza (2)Carlos Alberto Monteiro
This document summarizes a study that evaluated shifts in arbuscular mycorrhizal (AM) fungal communities along an anthropogenic nitrogen deposition gradient in coastal sage scrub vegetation in southern California. The researchers found that increasing nitrogen input was associated with displacement of larger-spored AM fungi species by proliferation of small-spored Glomus species. There was also a reduction in AM species richness and diversity, as well as decreases in spore abundance, root infection, and changes in spore production timing in more nitrogen-enriched sites. A fertilization experiment yielded similar results, indicating that nitrogen input likely explains the relationship between pollution and shifts in the AM communities.
Paper - Landscape Change Over 60 Years Surrounding Cedarburg BogJason Schroeder
This article describes my project to classify historical land use of the Cedarburg Bog. I worked on this as a student at the University of Wisconsin-Milwaukee.
Early Seral Ecosystem Creation And DynamicsEcoshare
This document summarizes information about early seral ecosystems. It defines early seral as a stage of forest succession immediately following a disturbance that removes most of the canopy cover. Early seral is characterized by less than 20% canopy cover and the establishment of light-demanding vegetation. The document discusses the components of early seral ecosystems and different disturbances that can create them, including their varying effects. It also covers successional pathways and regional patterns of early seral creation and decline.
David Lindenmayer_Transforming long-term plot-based research in Australia: LT...TERN Australia
This document discusses a collaborative book project involving 83 environmental professionals that described changes in Australian ecosystems based on long-term research. It included 14 chapters covering nine ecosystems, drawing from 35 core long-term studies. Key findings included detecting increased woodland bird populations and impacts of interventions like grazing control. The book aims to inform natural resource management by documenting ecosystem changes. Future work will maintain long-term sites, curate datasets, succession plan, and conduct new synthesis using long-term data to understand drivers of change across systems over time.
Can We Emulate Early Seral Forest Through SilvicultureEcoshare
1) This document discusses whether silviculture techniques can be used to emulate early successional forest conditions created by stand-replacing disturbances through the creation of structure and retention of legacies.
2) Stand-replacing disturbances create open growing space and dominance of early successional species, while legacies from the prior forest influence long-term development; management can potentially emulate these conditions.
3) Research shows that thinning and gap creation in mature forests can encourage early successional vegetation in the short term by altering structure, though full emulation requires attention to scale and composition over longer periods as vegetation develops.
The document discusses environmental zoning for biodiversity conservation in Lawaan, Eastern Samar, Philippines. It analyzed the area's biodiversity using ecological and social criteria through surveys and GIS mapping. Three zones were identified - very critical, critical, and less critical - based on biodiversity index values across elevation gradients. The study found that concentric zoning could lead to lower elevation extinction, and proposed environmental zoning as a new biodiversity conservation paradigm for the area.
This certificate awards Roelf Mias Coetzer for completing a 1-hour training course on Fire Dynamics Terminology on July 7, 2016. The certificate was issued by Mark Light, the Chief Executive Officer and Executive Director of the organization providing the training.
1) The sharing economy prioritizes short-term profits over long-term social and environmental impacts, with social goals considered as an afterthought.
2) For businesses to be truly sustainable, they must place equal importance on benefiting society as on their own profits.
3) By embracing purpose-driven models and supporting social causes, businesses can gain customer loyalty while also creating positive change.
1. The document discusses growing native trees that can thrive for 300 years by planting locally native species and accounting for substantial environmental changes expected from climate change and new pests/pathogens.
2. Resilience measures are needed to cover several centuries since current approaches can't be tested or targeted under high uncertainty about impacts.
3. Greater tree diversity is suggested, including non-local genotypes, replacement species, and pre-emptive diversification with analogue species to improve resilience of forests over centuries.
Beckel - Leaf physiology response across a disturbance gradient in a temperat...Rick Beckel
This document summarizes a study that examined the photosynthetic efficiency of sapling trees across four common species in a disturbed northern Michigan forest. Light response curves and measurements of apparent quantum yield and maximum photosynthetic rate (Amax) were taken for 117 saplings across a disturbance gradient caused by girdling over 6700 trees. Amax was found to significantly increase over the disturbance gradient for red oak and American beech saplings. This suggests these species have a strong capacity to take advantage of canopy gaps, which may impact future forest composition. The physiological responses observed could help refine parameters in earth systems models regarding forest response to disturbance.
Fire can be used for ecosystem maintenance, by triggering normal successional processes, or restoration, to repair degradation and reinstate conditions to enable recovery. Maintenance uses fire to avoid excessive senescence, while restoration uses fire to revive declining diversity, reduce fire-sensitive species, and trigger recovery. Shifting a site to alternative fire-sensitive vegetation is a last resort that should only be considered under specific conditions. Cultural burning can also restore cultural practices and landscapes when combined with ecological restoration goals.
This honors thesis studied how plant seed traits mediate changes in plant communities in Wisconsin's unburned prairies. The study tested hypotheses about differences in seed traits between burned and unburned prairie sites. Seed mass, coat thickness, and shape index were measured for species at different sites. Results showed unburned sites had higher average seed mass than burned sites, and a strong negative correlation between seed shape and mass. While some relationships between traits and fire history were found, fire was the main driver of community composition. The implications are that a lack of fires since the 1950s has influenced prairie makeup, and prescribed burns should be more widely used as a management tool.
Continuous Cover Forestry: an alternative model for the sustainable managemen...Edward Wilson
This paper was presented at the Institute of Fisheries Management 7th Specialist Conference, on the theme "Forestry and Fisheries - Where Next?". The event took place at Rheged, Penrith, Cumbria, England on 21-23 April 2015.
The presentation provides an overview of the principles of Continuous Cover Forestry and its application to woodlands in Britain. In addition, information is provided on the opportunities and challenges associated with continuous cover forestry in wooded watersheds and catchments. There is a need for more case studies and long-term study of forest development and environmental interactions in watersheds.
Seminar by Etienne Laliberté about his research program on edaphic drivers of plant diversity, and presentation of the Canadian Airborne Biodiversity Observatory (CABO)
This presentation by Roger Lembit of Gingra Ecological Surveys highlights the role of long term monitoring of fire impacts and plant response in guiding restoration strategies by discussing vegetation recovery at the State Mine Fire site.
Presentation from Nature Conservation Council of NSW 2015 Bushfire Conference - Fire and Restoration: working with fire for healthy land
This document provides background information on longleaf pine ecosystems and describes a study conducted at Oak Mountain State Park in Alabama. It discusses how longleaf pine ecosystems used to dominate the southeastern US but were largely destroyed by logging and fire suppression. The study aimed to better understand montane longleaf pine ecosystems by examining relationships between environmental variables, juvenile pine abundance, and adult pine basal area across foothill and mountain slope sites. It hypothesized that variables like decreased soil depth and increased slope or tree competition would negatively impact pine recruitment and growth. The document outlines the environmental variables measured, including canopy openness, slope, and soil depth.
This document summarizes research on cushion plants in the Hudson Bay Lowlands and their potential role in facilitating other plant and insect species. Cushion plants can provide shade, moderate temperatures and moisture levels, and protect other plants from wind and herbivores. The researcher aims to study whether alpine blueberry cushion plants facilitate other species, including tree seedlings, and whether this facilitation increases under more stressful environmental conditions. Data will be collected on plant diversity, seedling growth, insect visits, temperature, light, moisture and nutrients across sites that vary in elevation and disturbance level. Results will provide insights into how facilitation may help plant communities adapt to global environmental changes.
2011 year 8 geography - rainforests - vegetationdjgraygray
Rainforests have many unique types of vegetation that have adapted to the dense, humid environment. Lianas twist around trees in search of sunlight, while buttress roots support trees in the shallow soil. Epiphytes live on trees without contacting the ground, and strangler figs, ferns, mosses, and saprophytes also thrive in the rainforest.
1) There was a positive relationship between local and regional plant species richness in tallgrass prairie, but this relationship varied with grazing, topography, and fire frequency.
2) Experimental removal of the dominant grass Andropogon scoparius resulted in a significant increase in local species richness compared to reference plots.
3) Overall species richness was higher in grazed areas compared to ungrazed areas, but grazing did not significantly affect the relationship between number of sites occupied and average abundance across the landscape.
2011 year 8 geography - rainforests - geographic processesdjgraygray
The document discusses the complex ecosystem of rainforests, which features interactions between climate, landforms, soils, plants, and animals, with each component impacting the entire system. Key atmospheric and hydrologic processes that support rainforests are warm temperatures year-round and regular heavy rainfall. The balance of nutrients in rainforest soil and atmosphere is maintained through processes like photosynthesis, nutrient recycling, and leaching of nutrients into subsoil layers.
2011 year 8 geography - rainforests - layersdjgraygray
The rainforest has four main layers:
1) The emergent layer contains the tallest trees that tower 40-60m above the forest floor and receive plenty of sunlight.
2) The canopy layer forms a covering 25-45m high and maintains a moist environment, containing many flowers and fruits.
3) The understory receives only 2-5% of sunlight and contains smaller trees and plants like ferns.
4) The forest floor is thick with decaying material and provides rich nutrients for growth, but also competition between plants.
This document discusses how increased plant biodiversity in grasslands leads to greater ecosystem stability and productivity. It defines key terms like ecosystem, ecosystem services, biodiversity, and describes the diversity-stability hypothesis which proposes that more diverse ecosystems are more resilient to environmental disturbances as they are more likely to contain species that can thrive during perturbations. The document presents results from a study of 207 grassland plots showing that more species-rich plots had greater drought resistance, producing half the biomass loss during droughts, supporting the hypothesis. Maintaining biodiversity is important for grassland ecosystem stability.
Seminário 4 egerton-warburton_et_al-2000-ecological_applications_mycorrhiza (2)Carlos Alberto Monteiro
This document summarizes a study that evaluated shifts in arbuscular mycorrhizal (AM) fungal communities along an anthropogenic nitrogen deposition gradient in coastal sage scrub vegetation in southern California. The researchers found that increasing nitrogen input was associated with displacement of larger-spored AM fungi species by proliferation of small-spored Glomus species. There was also a reduction in AM species richness and diversity, as well as decreases in spore abundance, root infection, and changes in spore production timing in more nitrogen-enriched sites. A fertilization experiment yielded similar results, indicating that nitrogen input likely explains the relationship between pollution and shifts in the AM communities.
Paper - Landscape Change Over 60 Years Surrounding Cedarburg BogJason Schroeder
This article describes my project to classify historical land use of the Cedarburg Bog. I worked on this as a student at the University of Wisconsin-Milwaukee.
Early Seral Ecosystem Creation And DynamicsEcoshare
This document summarizes information about early seral ecosystems. It defines early seral as a stage of forest succession immediately following a disturbance that removes most of the canopy cover. Early seral is characterized by less than 20% canopy cover and the establishment of light-demanding vegetation. The document discusses the components of early seral ecosystems and different disturbances that can create them, including their varying effects. It also covers successional pathways and regional patterns of early seral creation and decline.
David Lindenmayer_Transforming long-term plot-based research in Australia: LT...TERN Australia
This document discusses a collaborative book project involving 83 environmental professionals that described changes in Australian ecosystems based on long-term research. It included 14 chapters covering nine ecosystems, drawing from 35 core long-term studies. Key findings included detecting increased woodland bird populations and impacts of interventions like grazing control. The book aims to inform natural resource management by documenting ecosystem changes. Future work will maintain long-term sites, curate datasets, succession plan, and conduct new synthesis using long-term data to understand drivers of change across systems over time.
Can We Emulate Early Seral Forest Through SilvicultureEcoshare
1) This document discusses whether silviculture techniques can be used to emulate early successional forest conditions created by stand-replacing disturbances through the creation of structure and retention of legacies.
2) Stand-replacing disturbances create open growing space and dominance of early successional species, while legacies from the prior forest influence long-term development; management can potentially emulate these conditions.
3) Research shows that thinning and gap creation in mature forests can encourage early successional vegetation in the short term by altering structure, though full emulation requires attention to scale and composition over longer periods as vegetation develops.
The document discusses environmental zoning for biodiversity conservation in Lawaan, Eastern Samar, Philippines. It analyzed the area's biodiversity using ecological and social criteria through surveys and GIS mapping. Three zones were identified - very critical, critical, and less critical - based on biodiversity index values across elevation gradients. The study found that concentric zoning could lead to lower elevation extinction, and proposed environmental zoning as a new biodiversity conservation paradigm for the area.
This certificate awards Roelf Mias Coetzer for completing a 1-hour training course on Fire Dynamics Terminology on July 7, 2016. The certificate was issued by Mark Light, the Chief Executive Officer and Executive Director of the organization providing the training.
1) The sharing economy prioritizes short-term profits over long-term social and environmental impacts, with social goals considered as an afterthought.
2) For businesses to be truly sustainable, they must place equal importance on benefiting society as on their own profits.
3) By embracing purpose-driven models and supporting social causes, businesses can gain customer loyalty while also creating positive change.
This literature review chapter discusses the evolution from prescriptive building codes to performance-based design approaches. It outlines that while prescriptive codes ensured structural integrity, they often led to overdesign and lacked economic efficiency. This pushed the development of performance-based methodologies. The chapter then examines performance-based design for fire safety, comparing it to prescriptive codes. It also explores the development of performance-based structural fire engineering approaches in different countries. Finally, it introduces the PEER PBDEE framework, outlining how it could be translated to a PBDFE methodology for this research.
This document discusses various health issues that can arise from prolonged computer use and provides tips for proper ergonomics and posture. It notes that repetitive strain injuries are the most common and serious issue, caused by improper posture and repetitive motions over long periods. It recommends taking short frequent breaks every 60 minutes, adjusting one's chair and workstation for proper back and wrist support, and avoiding prolonged bending of the arms and wrists. Eye strain can also occur from focusing between screens and documents.
The Retrofit Streetlight Array project aimed to produce an optical array that could be easily installed into existing streetlight units. Key aspects included allowing quick assembly to the metal gear tray using a spring clip and cantilever springs to raise the array 0.9mm for optimal optical performance. The array had to fit precisely over the PCB assembly within a tolerance of 0.3mm to meet specifications.
This document is a thesis submitted by Jeroen Wiebes Kjos for a Master's degree in Fire Safety Engineering. The thesis aims to validate the Fire Dynamics Simulator (FDS) model for simulating tunnel fires. It will do so by comparing FDS simulation results to experimental data from large-scale tunnel fire tests conducted in 2003 at the Runehamar tunnel in Norway. The validation will evaluate FDS's ability to model temperature, radiation, oxygen concentration, carbon monoxide concentration, carbon dioxide concentration, and gas velocity during a tunnel fire. If validated, FDS can then be used to study different fire safety strategies and their impact on tunnel conditions during a fire. The literature review discusses the importance of tunnel fire
Author profiling aims at identifying personal traits such as age, gender, native language or personality traits from writings. PR-SOCO task at PAN@FIRE goal is to predict Personality Traits from Source Codes.
The document summarizes the views of Thomas Allemann, a member of the management board of hotelleriesuisse, on the sharing economy and its impact on the hotel industry. It discusses the rise of platforms like Airbnb, the position of industry groups like HOTREC calling for regulation, and challenges for traditional hotels in adapting to new customer demands and a potentially less regulated competitive landscape for short-term rentals. Allemann argues that if sharing economy services are to be integrated into the tourism model, authorities must ensure fair competition, consumer protection standards, and tax contributions similar to those required of hotels.
The document provides an overview of the Taj Hotel industry in India. It discusses the different types of hotels in India categorized by star ratings and amenities. It then introduces the Taj Hotel group - its founding in 1903, current portfolio of over 75 hotels globally, and segmentation into luxury, business, and leisure hotels. The document also discusses Taj Hotel's marketing mix, competition, and awards and acquisitions over the years.
London Fire Brigade - Fire Resistance CPD PresentationDanny Hopkin
This document discusses the history and future of structural fire safety design. It begins by outlining how fire resistance testing originated in response to large fires in the late 1800s and early 1900s. While initial fire tests aimed to standardize safety evaluations, the standard time-temperature curve used today does not realistically represent an actual building fire. New building materials and designs are challenging traditional fire resistance approaches. The document advocates a performance-based structural fire engineering strategy over prescriptive code compliance. It provides an example project that used computational modeling, thermal analysis and structural modeling to demonstrate the fire safety of a complex building with unusual architectural features.
This document discusses fire-resistive construction elements and ratings. It describes the difference between specification codes, which specify construction types, and performance codes, which identify required fire resistance in hours. Rated assemblies are tested according to standard time-temperature curves to determine their ability to support loads, limit heat transfer, and prevent fire spread for a specified time period. Openings in rated walls and barriers must be protected, and fire blocking and draft stopping are used to control fire spread in concealed spaces.
On February 18, 2010, Richard Gallagher of Zurich presented the keynote presentation at the Fire Protection Research Foundation’s SUPDET 2010 event where he summarized the presentations of the previous day. Seven leading engineering firms presented their ideas on how best to protect a high challenge warehouse from fire.
Modeling Stochasticity and Gap Junction Dynamics: Integrate and Fire Modeldharmakarma
In this presentation, we describe a mathematical model for modeling the stochasticity of firing neurons based on a modified integrate and fire model that incorporates gap junction potential.
This document discusses revisions to NFPA 10 that mandate replacing outdated fire extinguishers. Specifically:
- Testing in the 1970s found novices had trouble operating extinguishers without discharge hoses, leading to design changes requiring hoses on larger extinguishers.
- The 2007 NFPA 10 edition requires removing stored pressure extinguishers made before October 1984, as they do not meet current standards.
- Extinguishers that cannot be properly serviced or maintained due to lack of manufacturer support must also be replaced.
The document discusses the National Building Code of India (NBC). It provides an overview of the history and development of the NBC since 1970. The NBC is intended to regulate building construction activities across India by establishing uniform guidelines. It covers various aspects of building design, construction, materials, services, fire safety and more. The NBC is revised periodically to reflect new practices and standards. The latest revision was in 2005.
National building codes 2005 history overviewShourya Puri
The National Building Code of India was first published in 1970 and has since been revised multiple times, with the latest version released in 2005. It aims to provide minimum standards and guidelines for building design, construction, and materials across India. Some key points:
- It was created in response to outdated building regulations and to standardize codes nationwide.
- The Bureau of Indian Standards was tasked with preparing the code and establishing guidance committees.
- The 2005 version consolidated decades of experience and incorporates modern practices. It covers topics like structural design, materials, fire safety, services, and more through 10 detailed parts.
- Salient features include improved seismic design, accessibility guidelines, heritage building provisions, and rainwater
Introduction
A hotel is “Home away from Home”.
A place where a bonafide traveler can receive food & shelter.
Security of guest & his property is of great concern for the hotel.
The management of any place of work are legally bound to provide a hazard-free, safe and secure environment to their employees.
One of the basic need of the hotel to plan safety and security plan for the hotel, its property & belongings.
At the same time is able to plan an efficient & effective system for guests & his belongings in terms of protection from mishaps, such as fire, theft etc.
Types of Security
Internal Security
Against theft, fire security, proper lighting.
External Security
Proper fencing of the building.
Fencing of pool area to avoid accidents in night.
Manning of service gates to restrict entry.
Staff
Identification of staff
Locker Inspection
Inventory records of different amenities.
Trash handling
Guest
Taking care of scanty baggage guest.
Keeping check of room, if guest has stolen or taken something along with him.
Threats in Hotel
Hotel’s Guardsmen
Upgradation in Technology
Advanced CCTV Cameras:
Clear Night Vision
High Resolution camera
Auto focus OR Face Recognition feature
Tag and Track system
Sound Recognition
Gait Recognition
Monitoring activity with software
Upgradation in Technology
ZAPLOX integrates mobile key with ASSA ABLOY locking:
1 Application, Multi- Functions.
Mobile access functionality for guests through RFID technology.
Key distribution is very easy.
Includes mobile check-in and check-out, room upgrades, direct bookings, special offers and more.
Mobile keys are highly secure, since a guest's Smartphone is less likely to be misplaced than a plastic keycard.
Upgradation in Technology
Upgraded Fire Alarm system:
Multi-criteria detectors can be set to varying degrees of sensitivity.
Lets management or security check the area before sounding a general evacuation alarm throughout the property.
When several detectors within an area are triggered, the fire alarm system can be programmed to initiate a full evacuation.
Same device that monitors both: Smoke and Fire.
The dual fire and CO detectors reduce overall installation time and material costs.
Upgradation in Safety Measures
Lift usage:
People entering the lobby and taking the lift to any floor must be stopped.
Lifts should be programmed.
Swiping room card in the lift and then lift will automatically take them to particular floor.
Managers providing a sense of ownership to employees:
Security will be much tighter.
Giving them more responsibility.
Creating a sense of ownership by profit sharing.
More aware staff is the need of the hour:
Staff is more interactive with guests.
Staff monitoring the body language of the guests with unusual behavior.
Trainings of safety and security measures more frequently.
Staff regularly updated with the evacuation plans.
More attentive
NFPA has created a Powerpoint presentation that you can use to help educate your community's decision-makers and the public about the dangers of lightweight construction materials under fire conditions. It features the stories of two incidents in which firefighters were killed or seriously injured in homes built according to the lightweight construction model. The presentation also includes data that shows that home fire sprinklers lessen the dangers posed by lightweight construction.
State and transition models (STMs) are tools that integrate ecosystem dynamics into management by defining alternative ecosystem states and the transitions between them. Climate relates to STMs by influencing ecological sites and the potential vegetation communities. As climate changes, STMs may need to consider shifting reference states and allow for novel communities. Applying STMs across mixed land uses adds complexity but can help assess conservation value under different land use states.
This presentation by Andy Baker discusses how fire-exclusion threatens the vast majority of Byron Shire’s fire-dependent vegetation and is likely to result in irreversible vegetation change and habitat loss unless fire is restored across the landscape.
Presentation from Nature Conservation Council of NSW 2015 Bushfire Conference - Fire and Restoration: working with fire for healthy lands.
Climate change is projected to pose challenges to forests through increased risks of moisture stress, habitat loss for northern species, more extreme weather events, and greater pressures from pests, diseases, fire and invasives. However, longer growing seasons and higher carbon dioxide levels may increase forest productivity in some areas. The effects on individual forests will depend greatly on local climate trends and conditions as well as forest management practices.
The document discusses climate change impacts in the Nepal Himalaya region. It notes that climate change is affecting temperature and rainfall patterns, causing glaciers to melt at faster rates. This is negatively impacting local communities who rely on natural resources for livelihoods. Case studies from the Annapurna Conservation Area show how community-based adaptation efforts, such as alternative energy programs and agriculture diversification, are helping to build resilience. The document calls for raising awareness of climate impacts in the Himalayas on a global scale.
Climate change is causing warming trends and increasing uncertainty about future conditions. Forest managers can help ecosystems adapt by developing adaptive silvicultural strategies. Strategies should focus on maintaining diversity, complexity, and resilience to allow ecosystems to accommodate changes like range shifts and disturbances. The presentation discusses climate impacts like longer growing seasons and expanded pest ranges, and outlines silvicultural systems to balance timber and habitat over time under climate change.
Presentation by Dr. Steve Jack to support the Adaptive Silviculture for Climate Change (ASCC) J.W. Jones Ecological Research Center Workshop held January 12-14, 2016
Managed forest contribution to carbon sequestration under a rising atmospheric CO2
Objectives:
Forest carbon is a cycle
Define forest carbon sequestration
Summarize what is known about how rising CO2 affects tree growth and forest health.
Carbon management under rising CO2. What can be done to increase or enhance carbon sequestration?
This document discusses fire ecology and the role of fire in various ecosystems. It notes that globally over 5,000 Tg of biomass is consumed annually by natural fires, emitting large amounts of carbon dioxide and other gases. It explores how certain plant communities like Mediterranean shrublands and African savannas have evolved with and depend on fire. In India, most fires are human-caused and burn over 3.7 million hectares annually. The document then examines the effects of fire on air, soil, plants, and vegetation characteristics. It looks at how fire impacts nutrients, organic matter, soil biota and properties like pH. Finally, it discusses plant adaptations to fire and the use of fire as a management tool.
A framework for assessing and projecting climate change effects on forest com...Jennifer Costanza
Presented at US-IALE annual meeting in Baltimore, MD. We are using hierarchical classification to produce an empirical set of forest tree assemblages for use in projection, assessment, and monitoring of global change effects on forest communities.
Dr. Robert Keane of RMRS Missoula Fire Lab and contributor to the Northern Rockies Adaptation Partnership assessment, presents climate change impacts and vulnerabilities for forests of the northern Rockies at the Adaptive Silviculture for Climate Change (ASCC) Workshop.
This document discusses strategies for improving the resiliency of Arkansas forests. It provides examples of how silviculture practices can enhance resiliency to disturbances like drought and wildfire. Specific practices include site preparation to concentrate water near tree roots, thinning stands to reduce competition, and reintroducing prescribed fire to Ozark forests to promote oak regeneration and reduce fire-intolerant species. Research is still needed to determine appropriate planting densities and thinning schedules to maintain pine forest resiliency during drought. The document emphasizes that modifying silviculture practices can help reduce losses from disturbances and increase overall forest productivity and health.
This seminar presentation discusses the impact of climate change on biodiversity. It begins with an overview of how to manage Earth's temperature through solar energy and greenhouse gases. It then examines worldwide carbon emissions over time and explains the greenhouse effect. The values of biodiversity are outlined, and the presentation shows the impact of climate change on forests visible from space. A case study examines the effect of climate change on mountain pine beetles. The main impacts of climate change discussed are species extinction, effects on forests, water, polar regions and wildlife. The presentation concludes that temperatures will continue to rise and growing seasons will lengthen.
Ecosystems cycle materials and energy through producers, consumers, and decomposers. Photosynthesis and respiration drive carbon and nitrogen cycles. Primary productivity is the gain by producers, while secondary productivity is the gain by consumers. Limiting factors like temperature, resources, and weather influence populations. Succession involves predictable changes in communities over time from pioneer to climax species. Measuring ecosystem changes involves repeated transects, satellite imagery, and environmental impact assessments.
Long-Term Patterns of Vegetation Change Following FireRoger Blew
This document summarizes research on long-term patterns of vegetation change following wildfires in sagebrush steppe ecosystems. The research found that following fires, native perennial grasses and forbs recovered quickly within two growing seasons, with limited invasion by non-native species. Over longer time periods of 20+ years, big sagebrush recovery was limited but diversity changed little. Recovery trajectories did not follow linear or predictable patterns and were influenced by local site factors more than time since fire. State-and-transition models of vegetation change need to be updated based on these long-term findings to better represent fire's role in maintaining healthy sagebrush steppe communities.
This presentation by Mick Wilson of Forestry Corporation NSW discusses case studies of burns and the experiences of fire management in Forestry lands presented, highlighting the challenges of resuscitating a fuel management programme within a complex regulatory framework.
Presentation from Nature Conservation Council of NSW 2015 Bushfire Conference - Fire and Restoration: working with fire for healthy land
Relation between forests and climate change. Forest responses and vulnerabilities to climate change mitigation. Role of forests in climate change mitigation.
Three fold role of forests in climate change; forests as victims of climate change, forests as drivers of climate change and forests as solution for climate change. Forest vulnerabilities to climate change; forest fire, forest degradation, effect on growth, structure and composition of forests. Emission of greenhouse gases from forests; natural and anthropogenic emissions. Afforestation and reforestation as solution for climate change. REDD+; Reducing Emissions from Deforestation and forest Degradation. Global forest status and Global Carbon Stocks. Sustainable development.
The document discusses how climate change is affecting terrestrial ecosystems. It notes that temperature and precipitation determine the distribution of biomes, and that climate change is causing biomes to shift locations as conditions change. Forests currently occupy about one third of U.S. land but are predicted to migrate or shrink substantially due to warming temperatures and changing rainfall patterns. Grasslands are also expected to transition to deserts or shrublands in many areas.
This presentation by Associate Professor Alan York of the University of Melbourne provides a brief overview of some of the studies that have increased our knowledge on the response of animals to fire and fire regimes. It outlines current research directions and discusses some of the evolving fire management strategies being implemented by land management agencies.
Presentation from Nature Conservation Council of NSW 2017 Bushfire Conference - Fire, Fauna & Ferals: from backyards to bush.
Similar to Fire and Forest Dynamics in Northern Boreal Forests (20)
Sudheer Mechineni, Head of Application Frameworks, Standard Chartered Bank
Discover how Standard Chartered Bank harnessed the power of Neo4j to transform complex data access challenges into a dynamic, scalable graph database solution. This keynote will cover their journey from initial adoption to deploying a fully automated, enterprise-grade causal cluster, highlighting key strategies for modelling organisational changes and ensuring robust disaster recovery. Learn how these innovations have not only enhanced Standard Chartered Bank’s data infrastructure but also positioned them as pioneers in the banking sector’s adoption of graph technology.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
Pushing the limits of ePRTC: 100ns holdover for 100 daysAdtran
At WSTS 2024, Alon Stern explored the topic of parametric holdover and explained how recent research findings can be implemented in real-world PNT networks to achieve 100 nanoseconds of accuracy for up to 100 days.
Unlock the Future of Search with MongoDB Atlas_ Vector Search Unleashed.pdfMalak Abu Hammad
Discover how MongoDB Atlas and vector search technology can revolutionize your application's search capabilities. This comprehensive presentation covers:
* What is Vector Search?
* Importance and benefits of vector search
* Practical use cases across various industries
* Step-by-step implementation guide
* Live demos with code snippets
* Enhancing LLM capabilities with vector search
* Best practices and optimization strategies
Perfect for developers, AI enthusiasts, and tech leaders. Learn how to leverage MongoDB Atlas to deliver highly relevant, context-aware search results, transforming your data retrieval process. Stay ahead in tech innovation and maximize the potential of your applications.
#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
TrustArc Webinar - 2024 Global Privacy SurveyTrustArc
How does your privacy program stack up against your peers? What challenges are privacy teams tackling and prioritizing in 2024?
In the fifth annual Global Privacy Benchmarks Survey, we asked over 1,800 global privacy professionals and business executives to share their perspectives on the current state of privacy inside and outside of their organizations. This year’s report focused on emerging areas of importance for privacy and compliance professionals, including considerations and implications of Artificial Intelligence (AI) technologies, building brand trust, and different approaches for achieving higher privacy competence scores.
See how organizational priorities and strategic approaches to data security and privacy are evolving around the globe.
This webinar will review:
- The top 10 privacy insights from the fifth annual Global Privacy Benchmarks Survey
- The top challenges for privacy leaders, practitioners, and organizations in 2024
- Key themes to consider in developing and maintaining your privacy program
Cosa hanno in comune un mattoncino Lego e la backdoor XZ?Speck&Tech
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
7. Alternate successional cycles
A. Black spruce domain
B. Broadleaf forest domain
Broadleaf
dominant
Black spruce
dominant
High moisture
High moss
Cool soils
FIRE
Local seed &
Resprouting
Slow
growth
Poor quality
seedbeds
(organic soil)
Slow nutrient turnover
Low competition
Low moisture
Low moss
Warm soils
Rapid
growth
Rapid nutrient turnover
High competition
Johnstone et al. 2010, Can. J. Forest Research
FIRE
Resprouting &
Seed dispersal
High quality
seedbeds
(mineral soil)
8. Alternate successional cycles
A. Black spruce domain
B. Broadleaf forest domain
Broadleaf
dominant
Black spruce
dominant
High moisture
High moss
Cool soils
FIRE
Local seed &
Resprouting
Slow
growth
Poor quality
seedbeds
(organic soil)
Slow nutrient turnover
Low competition
Low moisture
Low moss
Warm soils
Rapid
growth
Rapid nutrient turnover
High competition
Johnstone et al. 2010, Can. J. Forest Research
FIRE
Resprouting &
Seed dispersal
High quality
seedbeds
(mineral soil)
9. How do fire characteristics shape
patterns of forest resilience?
• Why study fire?
– Ubiquitous in western boreal region
– Sensitive to climate
– Post-fire recovery determines future forest
composition
12. Patch effects of fire severity
Low severity (organic)
– Poor seedbeds
– Recruitment requires high
seed inputs
– Favors serotinous conifers
High severity (mineral)
– Higher quality seedbeds
– Creates opportunities for
deciduous establishment
13. How does this influence forest
dynamics across
heterogeneous landscapes?
14. Fire severity and post-fire recovery
• Alaska 2004 fires
• 90 black spruce sites
• Initial stand recovery
15. • Environmental conditions
Field Data
– Potential site moisture
– Elevation
– Potential insolation
• Pre-fire stand structure
– Stem density
– Stem basal area
• Fire severity
– Composite Burn Index (CBI)
– Residual organic layer depth
• Post-fire recruitment
– Tree seedling density
– 4 years post-fire
18. Relative spruce dominance:
Recovery of spruce trajectory
Boosted regression tree, prediction error=0.42
Johnstone et al. 2010, Global Change Biology
19. Controls on spruce forest resilience
• Severe fires reduce the
competitive advantage of spruce
and favor deciduous species
• Severe fires alter soil microclimate
• Site moisture
– Warm, dry soils favor aspen
– Severe fires are also more likely
• Young stands vulnerable to
change
20. Studies of fire frequency using
overlapping fires
historic fire
overlap zones:
rapid disturbance return
recent fire
image courtesy of David Milne, Yukon Gov.
21. Repeat fires alter tree regeneration
40000
stem density (#/ha)
35000
***
Burned at >80 yr.
Burned at <30 yr.
30000
25000
20000
***
15000
***
10000
ns
5000
0
total
Picea
Pinus
Populus
Johnstone & Chapin 2006, Ecosystems
24. How old does a stand need to be
before there is sufficient cone
production to support regeneration?
25. Cone Production
(log scale)
Cones/tree (Log10 scale)
n=14, p<0.001, r=0.723
Number of Cones Present on Tree
n=170, p<0.001, r=0.360
2.5
2
1.5
1
0.5
0
0
20
40
60
80
Tree Age
Viglas & Johnstone, unpublished
26. Fire interval effects
• Repeat fires interrupt
conifer regeneration
cycles
– Reduced cone production
• Confers a regeneration
advantage to winddispersed seeds
• Net effect is to shift
trajectories to deciduous
dominance
27. Shifts in resilience cycles
Black spruce
dominant
Deciduous
dominant
Fire
High moisture
Cool soils
Slow turnover
Low moisture
Warm soils
Rapid turnover
Organic
seedbeds
Slow growth
Low competition
Mineral soil
seedbeds
Resprouting &
seed dispersal
Rapid growth
High competition
28. Shifts in resilience cycles
Black spruce
dominant
High moisture
Cool soils
Slow turnover
long fire interval
Deciduous
dominant
Fire
severe or
short-interval
fire
Low moisture
Warm soils
Rapid turnover
Organic
seedbeds
Slow growth
Low competition
Mineral soil
seedbeds
Resprouting &
seed dispersal
Rapid growth
High competition
29. Why is this important?
• Changes in forest cover affect:
– Carbon storage
– Energy and water transfer
– Wildlife and subsistence resources
– Feedbacks to future fire behavior
30. Fire severity and succession:
Impacts on future fire behavior
• High fire severity transforms black
spruce to deciduous forest
• Deciduous forest has lower flammability
Can fire-initiated changes create a
negative feedback to climate-driven
increases in fire activity?
31. ALFRESCO simulation experiment
• Spatial simulation model for boreal landscapes
• Succession influenced by fire severity
• 3 Severity Scenarios:
– Low (LSS): All fires burn with low severity (spruce trajectory)
– High (HSS): Maximum extent of high severity (decid. trajectory)
– Mix: Intermediate scenario
• High and moderate scenarios of climate warming
Area = ~ 2500
KEY:
Green & Yellow = Low Sev.
Red = High Sev. in HSS
Black = High Sev. in Mix + HSS
Area = ~1000
33. Disturbance & climate interact
to alter black spruce resilience
dynamic
equilibrium
directional
change
tundra
black spruce
deciduous
34. Future Research
• Mechanistic understanding of plant-soilmicrobial feedbacks
• Quantifying thresholds and tipping
points
• Landscape prediction of vulnerability to
change
35. Conclusions
• Fire is both catalyst and driver of
change
• Critical post-fire reorganization phase
• Both frequency and severity shape future
succession
• Landscape context => vulnerability to
change
• Understanding the drivers of resilience is
key to predicting future change