What is co-limitation, really?
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This document discusses co-limitation of nitrogen and phosphorus in northern hardwood forests. It summarizes previous research showing N and P co-limitation based on fertilization studies. Co-limitation is defined as a larger productivity response to adding N and P together versus individually. The project aims to determine if northern hardwood forests are co-limited by N and P, and if soil nutrient interactions contribute to any co-limitation. Studies are being conducted at multiple sites testing the effects of N, P, and N+P additions on tree growth and soil nutrients. Preliminary results suggest forests are mostly P-limited, but N and P interactions could induce sequential limitations over time through microbial uptake effects.
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(1) Fine roots of plants in mature northern hardwood forests were found to forage for patches of apatite, a primary mineral source of phosphorus, when phosphorus was limiting. (2) When phosphorus was added to the soil, fine root foraging for apatite decreased, since phosphorus availability was no longer limiting. (3) Addition of nitrogen to the soil increased overall fine root growth but did not change foraging for apatite, indicating that nitrogen increases plant demand for phosphorus.
Biodiverse - Rosauer talk @ iEvoBio conference June 2010
Biodiverse is a tool for spatial analysis of biodiversity that calculates various biodiversity indices including species richness, endemism, phylogenetic diversity, and beta diversity. It was developed by researchers at UNSW to investigate patterns in Australian plants and animals. Biodiverse allows users to visualize species and phylogeny distributions, calculate biodiversity metrics for areas, cluster areas based on biological similarity, and test significance using randomization procedures. It has been used in studies of Australian flora, frogs, and primates.
Plant Competition in Temperate Regions
This document summarizes information about plant competition in temperate regions. It discusses how abiotic factors like precipitation determine plant growth forms in different biomes like deserts and grasslands. Competition between plant species can limit population sizes and influence community structure and diversity. The competitive exclusion principle and niche differentiation theory suggest that closely similar species cannot coexist. Tilman's R* model of competition for limiting resources was tested in Minnesota grasslands, finding support that the species with the lowest resource threshold (R*) for nitrogen wins interspecific competition. Species' R* values correlated with root biomass, indicating their different resource allocation strategies influence competitive abilities.
Amy Ickowitz, CIFOR "Trees and Dietary Diversity in Africa"
Amy Ickowitz, CIFOR "Trees and Dietary Diversity in Africa"Independent Science and Partnership Council of the CGIAR
This document summarizes a presentation on the relationship between trees/forests and dietary diversity in Africa. The presentation hypothesizes that forests are important for nutrition in several ways, such as providing nutritious wild foods, supporting agricultural systems, and providing fuel wood and fallback foods. An analysis of Demographic and Health Survey data from 21 African countries found a statistically significant positive relationship between tree cover and dietary diversity in children. However, more detailed data is still needed to better understand this relationship. An ongoing project is collecting detailed dietary intake and land use data in 5 African countries to further examine the connections between nutrition and trees in sub-Saharan Africa.Sigma xi presentation
Matthew Merrigan, a junior at Pine Crest School, wrote a research proposal to examine the effects of environmental stressors on the genetic makeup of root nodules in legumes. He plans to grow five legume species in different soil types designed to represent various stressors. Root nodules will be harvested and the rhizobia sequenced and compared between soil types. Matthew hypothesizes that environmental stressors may cause mutations in nod genes, altering the rhizobial communities. The results could provide insights into how the environment shapes microbial diversity with implications for the legume-rhizobia symbiosis.
Sigma xi presentation
Matthew Merrigan, a junior at Pine Crest School, wrote a research proposal to examine the effects of environmental stressors on the genetic makeup of root nodules in legumes. He plans to grow five legume species in different soil types designed to represent various stressors. Root nodules will be harvested and the rhizobia sequenced and compared between soil types. The research aims to determine if environmental stressors cause mutations in nod genes responsible for the legume-rhizobia symbiosis. Future work could sequence specific nod factors to identify any mutations occurring from environmental stresses.
Soil fertility evaluation P K MANI
Soil Fertility evaluation -5 methods are involved. A value, Crititical concept by Cate and Nelson etc.
Trees and-dietary-diversity-in-africa
Trees and forests may be important for dietary quality and diversity in Africa according to this presentation. Analysis of Demographic and Health Survey data from 21 African countries found a statistically significant positive relationship between percentage tree cover and dietary diversity scores of children, as well as a nonlinear relationship with fruit and vegetable consumption. However, more detailed data is needed to better understand how and why children in more forested areas have more diverse diets. The presenter plans to collect more detailed dietary and land use data from villages with varying tree cover in 5 African countries to further examine the relationship between nutrition and trees in sub-Saharan Africa.
Similar to What is co-limitation, really? (20)
Could co-limitation be caused by different nutrients limiting shoots and root...
Could co-limitation be caused by different nutrients limiting shoots and root...
Soil Enzyme Activity Indicates P Limitation in northern hardwood forest
Soil Enzyme Activity Indicates P Limitation in northern hardwood forest
N-P co-limitation in young northern hardwood forest. Tim Fahey
N-P co-limitation in young northern hardwood forest. Tim Fahey
Mycorrhizal type and co-limitation of forest productivity. Noah Blumenthal
Mycorrhizal type and co-limitation of forest productivity. Noah Blumenthal
Root foraging for apatite is influenced by N and P availability
Root foraging for apatite is influenced by N and P availability
Biodiverse - Rosauer talk @ iEvoBio conference June 2010
Biodiverse - Rosauer talk @ iEvoBio conference June 2010
Amy Ickowitz, CIFOR "Trees and Dietary Diversity in Africa"
Amy Ickowitz, CIFOR "Trees and Dietary Diversity in Africa"
More from melnhe
Distinguishing N and P addition from the air using imaging spectroscopy. Alex...
This document discusses using imaging spectroscopy and field studies to distinguish between nitrogen (N) and phosphorus (P) additions from the air. It finds that N addition reduced reflectance by producing more chlorophyll and absorbing more light, while P addition increased reflectance. When a model was trained on treatment classes (control, N, P, N+P) for 75% of plots, it predicted the other 25% of plots with 83% accuracy. Field measurements of resin-available N and P in soil aligned with clustering of tree-top spectra responses to nutrients. This indicates trees can act as remote signals of belowground nutrient availability and function.
Germinants: The next generation. Denise Rauschendorfer
The document summarizes multiple studies on germinants conducted by different researchers from 2012 to 2020. It includes population density studies of American beech and sugar maple from 2012, 2018, and 2020 by Denise Rauschendorfer, Shinjini Goswami, and Thomas Mann. It also summarizes seedling survival data collected by Shinjini Goswami, seedling light availability studies, and stem mapping works created by Alex Young using data from previous and present studies. The document is funded by USDA NIFA and NSF, and more information can be found at the provided website.
Grow with the changes: Forest succession and woody debris. Joe Nash
1) The document analyzes data from two studies to quantify stocks of downed dead wood in northern hardwood forest stands of different ages.
2) Thirteen forest stands ages 31-145 years old were inventoried for coarse and fine woody debris using line intersect and nested subplot sampling.
3) The primary objective is to distinguish the characteristics of woody debris corresponding to different successional stages in northern hardwood forests.
Litterfall and soil respiration fluxes in the MELNHE study. Thomas Mann
This document summarizes a study examining how soil respiration and litterfall in northern hardwood forests are controlled by nutrient availability. The study measured soil CO2 fluxes and collected fine litterfall from treatment plots with different nitrogen and phosphorus additions across 13 forest stands from 2008-2019. Preliminary results found that nitrogen addition lowered soil respiration in nitrogen-poor sites from 2011-2013. While apparent trends were observed, the authors note that statistical analysis is still needed and fertilization effects on litterfall may be more complicated. Next steps include further statistical analysis and exploring why nutrient additions did not significantly impact soil respiration rates.
Fine dining: root morphology, mycorrhizal colonization, and nutrient amendmen...
This document discusses an experimental study that examined the effects of nutrient amendments on mycorrhizal colonization and root morphology in red maple seedlings. The study predicted that nitrogen amendments would decrease vesicles in roots, phosphorus amendments would increase coil structures, and root morphology would vary depending on mycorrhizal colonization and structures under each treatment type. It then describes the experimental design, data collection process involving root processing and staining, and analysis of mycorrhizal colonization and root morphology.
Sugar maple leaf characteristics vary with depth in the crown and nutrient ad...
This document summarizes a study that examined how the physical, chemical, and metabolic characteristics of sugar maple leaves vary with their depth in the tree crown and with the addition of nutrients. The study found that foliar nitrogen and chlorophyll increased deeper in the crown and with nitrogen addition, while foliar phosphorus increased with phosphorus addition. The study concludes that most leaves are shaded rather than just "sun" or "shade" leaves, and that examining the vertical gradient in a tree crown can help reveal relationships between leaf characteristics and nutrients.
The timing of senescence affects foliar p resorption dan hong
This document discusses a study on the timing of senescence and its effects on foliar phosphorus (P) resorption. The study (1) examined how foliar concentration and resorption of P and other nutrients varied with N, P, and N+P additions and between species, and (2) investigated whether the timing of senescence affected foliar resorption with nutrient additions. Field collections of green leaves and litter were made over multiple dates in the fall. Results showed adding N increased foliar N but decreased foliar P, while adding P increased foliar P. P resorption efficiency was lower under P additions and proceeded over the course of the fall.
Space wars the fight for light in the stands of bartlett sarah congress
This document discusses using LiDAR to map and quantify forest canopy structure within stands at Bartlett, Hubbard Brook, and Jeffers Brook. The first steps are to create maps of the tree canopy and describe the position of each species. Field data on species heights is collected along transects and recorded. Next steps are to combine LiDAR and field data to create species-specific vegetation area index profiles and determine if treatments have affected species dominance or position in the canopy.
Having a stake in nutrient cycling effects of n and p addition on wood decay...
In a 3-year pilot study, researchers placed sugar maple wood stakes in forest stands to examine the effects of adding nitrogen, phosphorus, both nutrients, and a control on wood decay. Over 273 stakes were distributed across plots with different nutrient additions or a control at 3 sites. The stakes will be collected and analyzed to determine percent mass loss over the study period, with future analysis of nutrients, soil microbes, and their role in wood decay.
Fruiting response of ectomycorrhizal fungi to nutrient additions claudia vi...
Collecting fungal sporocarps allows researchers to survey the effects of nutrient additions on mycorrhizal fungi fitness over a larger area than soil samples alone. The study aims to determine how ectomycorrhizal sporocarp abundance and fungal community composition vary with nitrogen, phosphorus, and combined nutrient additions and between seasons. Over 4,000 sporocarps from 35 genera and 160 morphospecies were collected and will be identified using genetic techniques to analyze impacts of nutrient manipulations.
Does the fate of n depend on p availability in soil - samuel butler
This document discusses using an N15 experiment to determine if the fate of nitrogen (N) in soil depends on the availability of phosphorus (P). Previous research found that adding phosphorus suppresses resin-available nitrogen in soils. Additional studies showed that trees grew more in response to added phosphorus in mid-aged and old growth forests, but responded more to added nitrogen in younger forests. The proposed experiment would use the N15 isotope to trace nitrogen pathways through soil organic matter, plant roots, the microbial biomass, and mineral soil.
Belowground c allocation estimated as soil respiration minus aboveground litt...
This document summarizes a study estimating belowground carbon allocation in forests by measuring soil respiration and aboveground litter inputs over multiple years. The researchers found that nitrogen decreases soil respiration and likely belowground carbon allocation, while phosphorus decreases leaf litter production. Preliminary results suggest phosphorus may matter more for aboveground growth while nitrogen affects belowground processes to a greater degree.
Baby boomers are there any surviving germinants from the recent mast year -...
The document discusses a study examining how nutrient treatments affect germination rates and seedling survival of American beech and sugar maple. The study had three hypotheses: 1) germination and survival of maple would be highest with calcium addition; 2) germination and survival of beech would reflect limitation of nitrogen or phosphorus; and 3) survival may reflect nutritional value of seedlings. Methods involved counting germinants and seedlings in nutrient treatment plots over two years. Results showed beech germination increased with nitrogen and phosphorus addition, while maple decreased. Seedling survival decreased with nitrogen and phosphorus addition but increased with calcium addition, with no difference between nitrogen and phosphorus effects.
And you thought there were no earthworms in our forests
There were few earthworms found at Bartlett but many earthworms were found at Jeffers Brook. Plots at Jeffers Brook with added nitrogen had fewer earthworms, while plots with added calcium had more earthworms.
Intro for asm workshop see
This document provides information about an upcoming workshop on quantifying uncertainty in monitoring. It includes:
- Details on presenters who will discuss topics like taxonomy of uncertainty, examples from NEON, detecting differences from rain gauge and mercury monitoring data, and measuring uncertainty in the Forest Inventory and Analysis.
- An agenda that will include introductions from participants, five minute presentations followed by discussion, and a general discussion on how the workshop helped and what further assistance is needed.
- Information on current practices in reporting uncertainty from ecosystem studies, including a survey that identified major sources of uncertainty and how respondents report, understand, and view the importance of different sources.
Asm2018 7 young
Forest inventory crews were analyzed to determine measurement errors in tree diameter. The study found bias may exist due to penalties for observations more than one class off. While measurement error magnitude was identified, the most uncertain measurements may not be the most important to improve. Propagating the errors into forest inventory data product calculations like timber volume and carbon storage will show which measurements are most important to improve.
Asm2018 6 dietze
The document discusses Pecan Project's uncertainty analysis for LTER ASM 2018. It analyzes parameter uncertainty and sensitivity, and outputs uncertainty through trait meta-analysis, iterative Bayesian calibration, and variance decomposition. Key findings include growth respiration and root water uptake being highly sensitive, and stomatal conductance variability differing between conifer and hardwood species and latitudes. The analysis aims to characterize, propagate, analyze, and reduce uncertainties.
Asm2018 5 yanai
Sampling intensity affects the ability to detect changes over time in soil nutrient concentrations. Higher sampling intensity through more samples or sampling sites allows for detection of smaller minimum detectable differences. A study analyzed how sampling intensity over time and space impacted the minimum detectable annual percentage change for concentrations of total carbon, nitrogen, and exchangeable magnesium, calcium, and potassium at different soil depths. The results provide guidance on sampling designs to balance detecting desired changes against costs of sample collection and analysis for soil monitoring.
Asm2018 4 y.yang
Using uncertainty analysis to provide sampling guidance in monitoring fish and loons for mercury pollution
Asm2018 3 mgreen
Monitoring locations that are difficult to access or have meteorological measurements like snow were considered for monitoring reduction due to logistical factors. Uncertainty estimates were used to gain confidence that reducing monitoring at these locations would still provide essential information. Locations on north and south facing slopes were specifically mentioned as candidates for reduced monitoring.
More from melnhe (20)
Distinguishing N and P addition from the air using imaging spectroscopy. Alex...
Distinguishing N and P addition from the air using imaging spectroscopy. Alex...
Germinants: The next generation. Denise Rauschendorfer
Germinants: The next generation. Denise Rauschendorfer
Grow with the changes: Forest succession and woody debris. Joe Nash
Grow with the changes: Forest succession and woody debris. Joe Nash
Litterfall and soil respiration fluxes in the MELNHE study. Thomas Mann
Litterfall and soil respiration fluxes in the MELNHE study. Thomas Mann
Fine dining: root morphology, mycorrhizal colonization, and nutrient amendmen...
Fine dining: root morphology, mycorrhizal colonization, and nutrient amendmen...
Sugar maple leaf characteristics vary with depth in the crown and nutrient ad...
Sugar maple leaf characteristics vary with depth in the crown and nutrient ad...
The timing of senescence affects foliar p resorption dan hong
The timing of senescence affects foliar p resorption dan hong
Space wars the fight for light in the stands of bartlett sarah congress
Space wars the fight for light in the stands of bartlett sarah congress
Having a stake in nutrient cycling effects of n and p addition on wood decay...
Having a stake in nutrient cycling effects of n and p addition on wood decay...
Fruiting response of ectomycorrhizal fungi to nutrient additions claudia vi...
Fruiting response of ectomycorrhizal fungi to nutrient additions claudia vi...
Does the fate of n depend on p availability in soil - samuel butler
Does the fate of n depend on p availability in soil - samuel butler
Belowground c allocation estimated as soil respiration minus aboveground litt...
Belowground c allocation estimated as soil respiration minus aboveground litt...
Baby boomers are there any surviving germinants from the recent mast year -...
Baby boomers are there any surviving germinants from the recent mast year -...
And you thought there were no earthworms in our forests
And you thought there were no earthworms in our forests
Recently uploaded
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
The technology uses reclaimed CO₂ as the dyeing medium in a closed loop process. When pressurized, CO₂ becomes supercritical (SC-CO₂). In this state CO₂ has a very high solvent power, allowing the dye to dissolve easily.
Applied Science: Thermodynamics, Laws & Methodology.pdf
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
Authoring a personal GPT for your research and practice: How we created the Q...
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
Direct Seeded Rice - Climate Smart Agriculture
Direct Seeded Rice - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
Randomised Optimisation Algorithms in DAPHNE
Slides from talk:
Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
Austrian-Slovenian HPC Meeting 2024 – ASHPC24, Seeblickhotel Grundlsee in Austria, 10–13 June 2024
https://ashpc.eu/
8.Isolation of pure cultures and preservation of cultures.pdf
Isolation of pure culture, its various method.
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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3:国家专业人才认证中心颁发入库证书
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The debris of the ‘last major merger’ is dynamically young
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Recently uploaded (20)
Immersive Learning That Works: Research Grounding and Paths Forward
Immersive Learning That Works: Research Grounding and Paths Forward
GBSN - Biochemistry (Unit 6) Chemistry of Proteins
GBSN - Biochemistry (Unit 6) Chemistry of Proteins
waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
Applied Science: Thermodynamics, Laws & Methodology.pdf
Applied Science: Thermodynamics, Laws & Methodology.pdf
Authoring a personal GPT for your research and practice: How we created the Q...
Authoring a personal GPT for your research and practice: How we created the Q...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
ESR spectroscopy in liquid food and beverages.pptx
ESR spectroscopy in liquid food and beverages.pptx
8.Isolation of pure cultures and preservation of cultures.pdf
8.Isolation of pure cultures and preservation of cultures.pdf
Juaristi, Jon. - El canon espanol. El legado de la cultura española a la civi...
Juaristi, Jon. - El canon espanol. El legado de la cultura española a la civi...
The cost of acquiring information by natural selection
The cost of acquiring information by natural selection
The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
What is co-limitation, really?
- 1. What is co-limitation, really? Team Shoestring: Joel Blum Tim Fahey Melany Fisk Christy Goodale Shinjini Goswami Mariann Johnston Ed Rastetter Craig See Matt Vadeboncoeur Adam Wild Ruth Yanai And many, many more!
- 2. Nutrient limitation of productivity Elser et al. (2007) Ecology Letters • Syntheses of fertilization studies predict N and P co-limitation
- 3. Nutrient limitation of productivity • Syntheses of fertilization studies predict N and P co-limitation • Defined by the way we detect it: larger productivity response to N+P together than to either alone • What underlies that treatment response? – Additive – Synergistic NP NPCon NP NPCon
- 4. General Project Questions 1. Is productivity in the northern hardwood forest co-limited by N and P? 2. Do soil nutrient interactions contribute to co-limitation?
- 5. Mid-age forest Mature forest Young: 15-20 yrs Mid-age: 35-40 yrs Mature: 100+ yrs Study Sites
- 6. 3 sites: •Jeffers Brook •HBEF •BEF 2 stands per site: 1 mid-age 1 mature 9 stands at BEF: 3 young 3 mid-age 3 mature Study Sites
- 7. Study Sites 4 (sometimes 5) plots per stand
- 8. Treatments (And sometimes Ca) N (30 kg/ha/yr) P (10 kg/ha/yr) N+P Control • DBH (trees > 10 cm) and soil processes quantified pre- and post-treatment
- 9. General Project Questions 1. Is productivity in the northern hardwood forest co-limited by N and P? - no (varies, but mostly P-limited) 2. Do soil nutrient interactions contribute to co-limitation?
- 10. Interactions between soil N and P availability Soil solution Organic nutrients Microorganisms Plants Leaching Resin strips measure what’s in soil solution
- 11. Interactions between soil N and P availability
- 12. • Threshold P, above which N is very low • Plant and microbial evidence suggest that microbial uptake of N suppresses availability to plants Interactions between soil N and P availability
- 13. Interactions between soil N and P availability Soil solution Organic nutrients Microorganisms Plants Leaching P P N P N • Microbial uptake of N suppresses availability to plants • Expect plant productivity in NP plots to begin to exceed that in P plots • Co-limitation?
- 14. Conclusions 1. Is productivity in the northern hardwood forest co-limited by N and P? - no 2. Do soil nutrient interactions contribute to co-limitation? - if “co-limitation” is detected, it will be sequential - arising from nutrient interactions, rather than simultaneous limitations by multiple nutrients 3. New hypothesis: alleviating microbial P limitation induces N limitation over time 1. predict that plant and microbial responses to N+P will soon exceed those to P