Beech bark disease: bugs and fun guys

•Download as PPTX, PDF•

0 likes•365 views

This document summarizes a study on Beech Bark Disease. The study looked at how nitrogen to phosphorus ratios (N:P) in beech bark influences fungal lesion development, and whether treatments altering N/P levels impact disease severity, insect populations, or fungal growth. Samples were taken from beech trees in plots receiving different N/P treatments, including bark collections and long-term photography of marked trees. Analysis of images and fungal samples sought correlations between N/P levels and disease symptoms to better understand factors influencing the disease complex.

Environment

Beech Bark Disease
Bugs and Fun-Guys
An Nguyen / Mentor: Mariann Johnston
Thank you Ben and Dan for helping with the project!
Image credit: Jon Cale Image credit: Mariann Johnston Image credit: main.nc.us

Background:
- Higher N:P in bark predisposes beech to
fungal lesion development. (Cale et al. 2015)
- X. betulae might also be a causal agent in
the BBD disease complex.
Bartlett mid (C6) and old age (C7, C8)
stands:
- 5 beech trees per plot
- 8 frames painted per tree, for long-
term photographing and monitoring
- Fungal sample collection
Questions:
Is severity of BBD correlated with N:P
balance? And/or N/P treatment?
Correlation of bugs and fun-guys with
treatment?
Remaining work:
- Image analysis
- Fungal
identification
- Culturing
Neonectria

The document describes a study that tested whether adding phosphorus and nitrogen increased seed production in red maple (Acer rubrum) trees. Researchers collected red maple seeds from spring litter under trees that received different nutrient treatments but did not detect a significant effect of the treatments on seed counts. They note that improving the seed collection design could help account for potential predation by small mammals.

Root foraging for apatite is influenced by N and P availability

melnhe

(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.

Get up off the couch! How much of the soil microbial biomass is active?

melnhe

The document discusses methods to determine how much of the soil microbial biomass is active, including the substrate-induced respiration method which compares basal respiration to respiration induced by added glucose. It notes that total microbial biomass is important as a nutrient pool, while the active fraction rapidly decomposes organic matter and returns nutrients to soil. The document questions whether nitrogen or phosphorus availability increases the active fraction of the microbial biomass.

The effect of P and N addition on red maple seed production.

melnhe

The document discusses a study that tested the effect of adding phosphorus and nitrogen on red maple seed production. It found that while red maple trees can change sex from year to year and with nutrient changes, adding phosphorus and nitrogen did not significantly increase red maple seed counts collected from litter, possibly due to seed predation by small mammals interfering with results. The study aims to improve its seed collection design to account for this factor.

Sap flow: Calcium, and what about N and P?

melnhe

This document summarizes research on the effects of calcium (Ca), nitrogen (N), and phosphorus (P) additions on tree transpiration rates. The research found that: 1) A 2014 study found that a one-time addition of calcium silicate (CaSiO3) increased transpiration over the control plots, especially for yellow birch trees. Transpiration rates also varied between tree species and sites. 2) A 2015 study found that adding phosphorus (P) alone decreased transpiration rates in white birch trees compared to other treatments. 3) Overall, the research suggests that calcium and phosphorus can impact tree water use and transpiration rates. Precise measurements of sap flow

MELNHE overview 2016

melnhe

The document summarizes findings from a study conducted at 3 sites with a total of 9 stands of varying ages. At each site there were 2 stands, one mid-age and one mature. The 3 young, 3 mid-age and 3 mature stands were located at one of the sites. The study found that foliar N:P ratios indicated colimitation by nitrogen and phosphorus. Mature stands responded more to phosphorus additions while young stands responded more to nitrogen additions. Phosphorus additions decreased soil respiration and sap flow while calcium additions increased sap flow. Phosphorus additions also increased microbial phosphorus while nitrogen additions decreased microbial nitrogen. Both nitrogen and phosphorus additions also increased root biomass.

Is soil respiration affected by nutrient availability?

melnhe

Aboveground growth responds more to P than N

melnhe

1. A study examined how nitrogen (N) and phosphorus (P) limitation affects aboveground growth in northern hardwood forests of different ages. 2. The study applied N, P, and N+P fertilizer treatments to young, mid-age, and mature forest stands over 5 years and measured tree growth responses. 3. The results showed that aboveground growth responded more to P fertilization in mid-age and mature forests, while growth in young forests responded more to N fertilization, indicating that P limits older stands while N limits younger stands.

Elevated levels of nitrogen and phosphorus were added to soils in northern hardwood forests to test their effects on microbial biomass. Microbial cells were lysed using the chloroform fumigation method to measure the nutrient content of the biomass and determine which nutrient, nitrogen or phosphorus, most limited microbial growth. Previous results suggested phosphorus limitation and nitrogen suppression of microbial biomass. Further analysis is being conducted to measure the effects on total biomass carbon and nutrient ratios to better understand the response of microbial biomass and nutrients to the additions of nitrogen and phosphorus.

If a tree stands in the forest and nobody knows where it is: Mapping trees in...

melnhe

This document discusses using stem mapping to understand patterns of soil respiration. It notes that forest stands are about evenly split between trees associated with arbuscular mycorrhizae fungi and ectomycorrhizae fungi. Stands dominated by trees with arbuscular mycorrhizae are likely to have higher soil respiration rates, since these fungi promote more microbial activity in the soil. The study will identify tree positions, measure soil respiration data, and compare it to the dominant tree species in the stands.

Beech interference with maple regeneration: future change in forest composition.

melnhe

The document discusses a study on the interference of American beech with the regeneration of red maple and sugar maple in forests. The study examined seed and root sprout production from 2004-2010 and 2011-2015 in plots under continuous beech, plots where beech had been removed, and control plots. It found that beech bark disease and beech's production of root sprouts inhibited the regeneration of the maple species over the study period.

Foliar nutrient resorption reflects interactions of N and P availablity

melnhe

This document summarizes a study that investigated nutrient resorption efficiency in tree species across different forest stands. The study found that: 1) Nitrogen resorption efficiency in senescing leaves was correlated with higher phosphorus concentrations in green leaves, not nitrogen concentrations. 2) Phosphorus resorption efficiency was correlated with higher nitrogen concentrations in green leaves, not phosphorus concentrations. 3) Experimental fertilization showed that green leaf nitrogen was lower with phosphorus addition, while green leaf phosphorus was unaffected by nitrogen addition. This suggests trees were phosphorus-limited or co-limited in control plots.

Eli inventory REUcon

melnhe

The document examines whether fertilizing trees leads to faster growth. It describes a study measuring the diameter growth of trees in plots with different nutrient treatments (nitrogen, phosphorus, nitrogen and phosphorus combined). The results found that yellow birch showed a strong growth response to the treatments, while previous findings of increased growth in white birch were no longer significant. Mapping of the mature tree stands was also conducted to understand tree interactions and nutrient limitations in northern forests.

Stephanie snail REUcon

melnhe

The document describes a study that placed cardboard in four forest stands to collect snails and examine the effects of nitrogen, phosphorus, and calcium additions. Cardboard collection occurred four times over the summer. The results showed that only nitrogen and phosphorus additions in one stand (JBO) increased snail numbers compared to the control. Calcium additions increased snail numbers in all stands except one. The study aims to further examine the impacts of soil properties on snail populations.

Yanai iufro subplenary

melnhe

This document discusses quantifying uncertainty in ecosystem budgets. It provides examples of different types of uncertainty commonly encountered in ecosystem studies, including natural variability, measurement error, and model error. The document also examines specific studies that have quantified uncertainty in components of the nitrogen budget at the Hubbard Brook Experimental Forest, including precipitation inputs, streamflow outputs, forest biomass nitrogen, soil nitrogen pools, and nitrogen accumulation rates. Monte Carlo simulations were used to analyze how uncertainty in inputs propagates to uncertainty in overall budget calculations. The studies aim to improve estimates of uncertainty and identify areas where reducing uncertainty could have the most impact.

Hb2013 biche decomp

melnhe

This document describes a study on leaf litter decomposition in the Melnhe stands conducted by a researcher and middle school teacher. The study tested hypotheses about what controls litter mass loss by examining the effects of nutrients, mesh size, and litter mixes from young and mature tree stands. Methods involved placing litter in plots with different nutrient treatments, mesh sizes, and litter mixes. Preliminary results found significant effects of nutrients, mesh size, and their interaction on litter mass loss, with some indication of a phosphorus effect and young stand litter decomposing faster. The researcher and teacher saw the potential for middle school students to do authentic local science.

Hb2013 yang tissuesovertime

melnhe

This document summarizes a case study examining changes in tree tissue chemistry over time in the Huntington Wildlife Forest. It analyzes nitrogen concentration in branches of American beech, red maple, sugar maple, and yellow birch from 1985 to 2012, finding significant changes. It also discusses how branch nutrients vary by branch diameter and tissue position, citing data showing higher nitrogen and potassium concentrations in smaller diameter, living branches from the upper crown. The study aims to better understand how forest productivity and sustainability are impacted by nitrogen deposition and acidification over time.

Hb2015 barner

melnhe

This document summarizes Jerome Barner's master's thesis research comparing belowground carbon allocation in tree roots, microbes, and mycorrhizal fungi under different nitrogen and phosphorus fertilization treatments. The objectives are to determine how carbon allocation to fungal compartments responds to fertilization and how fertilization affects fungal species abundance and diversity. Methods include measuring fine root biomass, soil respiration, and sequencing fungal communities from ingrowth bags under nitrogen, phosphorus, and combined nitrogen and phosphorus fertilization at three forest sites. Expected results include decreased carbon allocation and fungal diversity under nitrogen and variable responses to phosphorus, with increased fine root biomass under both nutrients.

Hb2013 intro

melnhe

Shoestring2014 8-ca soil moisture

melnhe

This document summarizes a study that added wollastonite (CaSiO3) to experimental forest plots in New Hampshire to examine the effects on soil moisture and tree productivity. Wollastonite was added to bring calcium levels back to pre-industrial amounts, as acid rain has caused leaching of calcium from soils. Previous studies at Hubbard Brook found short-term increases in transpiration and productivity after wollastonite addition. This study monitored soil moisture in wollastonite and control plots, finding one plot (C6 at 30cm depth) had significantly lower soil moisture in the wollastonite area during the growing season, suggesting higher water use by trees, though other data was inconclusive due to

Hb2013 zahor transpiration

melnhe

This study examines the impact of calcium addition on tree transpiration and root function in New England forests impacted by acid rain. Sapflux measurements showed higher transpiration rates in trees on plots with added calcium silicate compared to control plots, with the strongest response in American beech. Preliminary root analysis found higher live fine root tissue and lower embolism in yellow birch roots from the calcium treatment plot compared to the control in early spring. The study is ongoing across three sites on the White Mountain National Forest to further understand the mechanisms by which calcium impacts forest water use and health.

Shoestring2014 6-respiration

melnhe

This document summarizes research on the effects of nutrient addition on soil respiration in northern hardwood forests. It finds that: 1) Soil respiration and belowground carbon allocation declined with increasing soil nutrient availability across study sites. 2) The addition of nitrogen and phosphorus nutrients reduced soil respiration the most in the most infertile sites, likely by reducing belowground carbon allocation and root-associated respiration. 3) There were some indications that sites may have been co-limited by both nitrogen and phosphorus, as nutrient additions of both together had stronger effects on respiration in infertile sites than additions of either nutrient alone.

Hb2013 kendrick moisture

melnhe

This document discusses a study investigating the effects of calcium addition on soil moisture levels. The study examines six plots in New Hampshire forests that were fertilized with calcium-silicate and compares them to control plots. The study hypothesizes that soil moisture levels will decrease more in the fertilized plots, especially in older stands with lower nutrient availability and closer to the forest floor. Soil moisture data is being collected using dataloggers placed at various soil depths. Preliminary results from two sites show differing impacts of calcium addition on soil moisture, depending on stand age and nutrient levels. Future work will examine data collection improvements and additional analysis methods.

Hb2015 hayden-decomp

melnhe

COOPERATORS' MEETING, Woodstock NH, Wednesday, 8 JULY 2015. Session l: Multiple Element Limitation Study Moderator: Ruth Yanai. Decomposition in the MELNHE plots: Filter paper and tea bags Matthew Hayden, SUNY- ESF Using a modified version of a new method called the Tea Bag Index, this study addresses two questions- will there be a noticeable difference in decomposition rates of tea across plots? and will the use of tea as litter be sufficient in identifying short term trends in decomposition?

Iufro uncertainty mexicov5_cw

melnhe

- The document discusses Mexico's Monitoring, Reporting and Verification (MRV) system for estimating carbon stock changes in forests. - Mexico's MRV system aims to estimate carbon stock changes and greenhouse gas emissions/removals from the LULUCF sector for national greenhouse gas inventories. - The National Forest Inventory provides data on carbon stocks and stock changes, while satellite imagery is used to monitor forest area changes. - Estimates show the forest sector is currently a large carbon sink, absorbing emissions from deforestation and degradation. However, uncertainties in these estimates need to be reduced to support policy decisions.

Shoestring2014 2-recovery

melnhe

Sophie harrison sap flow REUcon

melnhe

This document discusses a study measuring the effect of wollastonite (CaSiO3) addition on tree transpiration. Sap flow was measured in American beech, sugar maple, and yellow birch trees using the Granier method in control and wollastonite plots across three sites: Bartlett Experimental Forest, Hubbard Brook Experimental Forest, and Jeffers Brook. Preliminary results found increased sap flow in the Bartlett and Jeffers Brook wollastonite plots but decreased flow in Hubbard Brook. Statistical analysis will be done to further analyze the effects. The goal is to understand how CaSiO3 impacts forest hydrology and health with regards to acid rain to inform management practices.

Shoestring2014 4-snails

melnhe

Distinguishing N and P addition from the air using imaging spectroscopy. Alex...

melnhe

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

melnhe

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.

Viewers also liked

Does elevated N or P increase the microbial biomass in the soils of the north...

melnhe

If a tree stands in the forest and nobody knows where it is: Mapping trees in...

melnhe

Beech interference with maple regeneration: future change in forest composition.

melnhe

Foliar nutrient resorption reflects interactions of N and P availablity

melnhe

Eli inventory REUcon

melnhe

Stephanie snail REUcon

melnhe

Yanai iufro subplenary

melnhe

Hb2013 biche decomp

melnhe

Hb2013 yang tissuesovertime

melnhe

Hb2015 barner

melnhe

Hb2013 intro

melnhe

Shoestring2014 8-ca soil moisture

melnhe

Hb2013 zahor transpiration

melnhe

Shoestring2014 6-respiration

melnhe

Hb2013 kendrick moisture

melnhe

Hb2015 hayden-decomp

melnhe

Iufro uncertainty mexicov5_cw

melnhe

Shoestring2014 2-recovery

melnhe

Sophie harrison sap flow REUcon

melnhe

Shoestring2014 4-snails

melnhe

Viewers also liked (20)

Does elevated N or P increase the microbial biomass in the soils of the north...

If a tree stands in the forest and nobody knows where it is: Mapping trees in...

Beech interference with maple regeneration: future change in forest composition.

Foliar nutrient resorption reflects interactions of N and P availablity

Eli inventory REUcon

Stephanie snail REUcon

Yanai iufro subplenary

Hb2013 biche decomp

Hb2013 yang tissuesovertime

Hb2015 barner

Hb2013 intro

Shoestring2014 8-ca soil moisture

Hb2013 zahor transpiration

Shoestring2014 6-respiration

Hb2013 kendrick moisture

Hb2015 hayden-decomp

Iufro uncertainty mexicov5_cw

Shoestring2014 2-recovery

Sophie harrison sap flow REUcon

Shoestring2014 4-snails

More from melnhe

Distinguishing N and P addition from the air using imaging spectroscopy. Alex...

melnhe

Germinants: The next generation. Denise Rauschendorfer

melnhe

Mycorrhizal type and co-limitation of forest productivity. Noah Blumenthal

melnhe

This study investigated how the two types of mycorrhizal associations in northern hardwood forests (arbuscular mycorrhizal and ectomycorrhizal) influence nutrient limitations and forest productivity. The researchers measured annual stem growth in mature forest stands between 2015-2019. They found that nutrient additions of nitrogen and phosphorus had interactive effects on productivity, suggesting co-limitation, and this effect was stronger for arbuscular mycorrhizal tree species than ectomycorrhizal species. They concluded the greater relative abundance of arbuscular mycorrhizal trees promotes nutrient co-limitation in mature northern hardwood forests.

Grow with the changes: Forest succession and woody debris. Joe Nash

melnhe

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

melnhe

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.

N-P co-limitation in young northern hardwood forest. Tim Fahey

melnhe

1) The document discusses nitrogen, phosphorus, and fine roots in young northern hardwood stands. 2) It presents the hypothesis that growth of new fine roots in these stands may be co-limited by balanced mineral nutrition of nitrogen and phosphorus. 3) A factorial experiment using ingrowth cores found that fine root growth and biomass increased at the plot level in response to the addition of both nitrogen and phosphorus, but not from the addition of only one nutrient.

Fine dining: root morphology, mycorrhizal colonization, and nutrient amendmen...

melnhe

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.

Could co-limitation be caused by different nutrients limiting shoots and root...

melnhe

(1) The MELNHE study examines nutrient co-limitation of forest productivity across 13 forest stands of different ages located in three sites. Fertilization experiments add nitrogen, phosphorus, or both to test for co-limitation. (2) So far, tree growth has been found to be primarily limited by phosphorus rather than nitrogen or co-limitation. (3) A new study tested whether root growth is directly limited by nitrogen or phosphorus availability, or responds to aboveground nutrient allocation. Fine root growth responded directly to nitrogen addition but not phosphorus addition, and roots foraged more in phosphorus-rich patches.

Sugar maple leaf characteristics vary with depth in the crown and nutrient ad...

melnhe

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

melnhe

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

melnhe

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...

melnhe

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...

melnhe

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

melnhe

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...

melnhe

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 -...

melnhe

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

melnhe

Intro for asm workshop see

melnhe

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

melnhe

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

melnhe

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.

More from melnhe (20)