A5074320412- Methane Hydrates and Related Phenomena
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Plant responses to elevated CO2
- Mycorrhizal Fungi and Plant Interactions
- Weed Control and Herbicide Applications
- Ecology and Vegetation Dynamics Studies
- Forest Ecology and Biodiversity Studies
- Seed Germination and Physiology
- Plant Parasitism and Resistance
- Agronomic Practices and Intercropping Systems
- Horticultural and Viticultural Research
- Fire effects on ecosystems
- Hydrology and Watershed Management Studies
- Botany and Plant Ecology Studies
- Microbial Community Ecology and Physiology
- Seedling growth and survival studies
- Turfgrass Adaptation and Management
- Plant and animal studies
- Plant-Microbe Interactions and Immunity
Montana State University
2020-2024
Los Alamos National Laboratory
2018-2022
Oregon State University
2014-2018
Ecological Society of America
2018
The concept of iso- vs. anisohydry has been used to describe the stringency stomatal regulation plant water potential (ψ). However, metrics that accurately and consistently quantify species' operating ranges along a continuum have elusive. Additionally, most approaches quantifying iso/anisohydry require labour-intensive measurements during prolonged drought. We evaluated new previously developed ψ soil drying in eight woody species determined whether easily-determined leaf pressure-volume...
Uncertainties surrounding tree carbon allocation to growth are a major limitation projections of forest sequestration and response climate change. The prevalence extent which assimilation (source) or cambial activity (sink) mediate wood production fundamentally important remain elusive. We quantified source-sink relations across biomes by combining eddy-covariance gross primary with extensive on-site regional ring observations. found widespread temporal decoupling between growth, underpinned...
Because iso- and anisohydric species differ in stomatal regulation of the rate magnitude fluctuations shoot water potential, they may be expected to show differences plasticity their relations components, but explicit comparisons this nature have rarely been made. We subjected excised shoots co-occurring Juniperus monosperma isohydric Pinus edulis pressure-volume analysis with without prior artificial rehydration. In J. monosperma, potential at turgor loss (Ψ(TLP)) ranged from -3.4 MPa...
Species' differences in the stringency of stomatal control plant water potential represent a continuum isohydric to anisohydric behaviours. However, little is known about how quasi-steady-state regulation may relate dynamic behaviour stomata and photosynthetic gas exchange species operating at different positions along this continuum. Here, we evaluated kinetics light-induced opening, activation photosynthesis features 10 woody selected degrees anisohydry. Based on previously developed proxy...
We examined the effect of soil microbial communities on plant physiological responses to drought. Bouteloua gracilis seeds were planted in sterilized sand with (inoculated) and without (controls) communities. After substantial growth, drought was imposed by completely withholding water. Before moisture declined zero, inoculated plants germinated faster, significantly taller, maintained greater than controls. The allowed photosynthesis but also induced lower tissue tolerance (as indicated...
Rapid microbial growth in the early phase of plant litter decomposition is viewed as an important component soil organic matter (SOM) formation. However, taxa and chemical substrates that correlate with carbon storage are not well resolved. The complexity communities diverse substrate chemistries occur natural soils make it difficult to identify links between community membership processes environment. To potential relationships microbes, matter, their impact on storage, we used sand...
Temperature and the frequency intensity of heat waves are predicted to increase throughout 21st century. Germinant seedlings expected be particularly vulnerable stress because they in boundary layer close soil surface where intense heating occurs open habitats. We quantified leaf thermotolerance whole-plant physiological responses first-year germinant two populations each Pinus ponderosa P. C. Lawson (PIPO) Pseudotsuga menziesii (Mirb.) Franco (PSME) from climates with contrasting...
Leaf hydraulics, gas exchange and carbon storage in Pinus edulis Juniperus monosperma, two tree species on opposite ends of the isohydry-anisohydry spectrum, were analyzed to examine relationships between hydraulic function carbohydrate dynamics. vulnerability, leaf water potential (Ψl ), conductance (Kleaf photosynthesis (A), stomatal (gs) nonstructural (NSC) content throughout growing season. vulnerability was significantly lower relatively anisohydric J. monosperma than more isohydric P....
Abstract Given future climate predictions of increased temperature, and frequency intensity heat waves in the tropics, suitable habitat to grow ecologically, economically, socially valuable Coffea arabica is severely threatened. We investigated how leaf age stress duration impact recovery from C. . Treated plants were heated a growth chamber at 49°C for 45 or 90 min. Physiological was monitored situ using gas exchange, chlorophyll fluorescence (the ratio variable maximum fluorescence, F V /...
Plant survival during environmental stress greatly affects ecosystem carbon (C) cycling, and plant-microbe interactions are central to plant survival. The release of C-rich root exudates is a key mechanism plants use manage their microbiome, attracting beneficial microbes and/or suppressing harmful help withstand stress. However, critical knowledge gap how alter exudate concentration composition under varying levels. In greenhouse study, we imposed three drought treatments (control, mild,...
First-year tree seedlings represent a particularly vulnerable life stage and successful seedling establishment is crucial for forest regeneration. We investigated the extent to which Pinus ponderosa P. & C. Lawson populations from different climate zones exhibit differential expression of functional traits that may facilitate their establishment. Seeds two sites with contrasting precipitation temperature regimes east (PIPOdry) west (PIPOmesic) Oregon Cascade mountains were sown in common...
A century of fire suppression across the Western United States has led to more crowded forests and increased competition for resources. Studies forest thinning or stand conditions after mortality events have provided indirect evidence how can promote drought stress predispose severe and/or bark beetle outbreaks. Here, we demonstrate linkages between deficits increasing through analyses annually resolved tree-ring growth, scars, carbon isotope discrimination (Δ13 C) a dry mixed-conifer...
Changing climates can cause shifts in temperature and precipitation, resulting warming drought some regions. Although each of these factors has been shown to detrimentally affect forest ecosystems worldwide, information on the impacts combined effects is lacking. Forest trees rely mutualistic root-associated fungi that contribute significantly plant health protection against climate stresses. We used a six-year, ecosystem-scale precipitation manipulation experiment targeted simulate 2100...
C.G. was supported by the Swiss National Science Foundation SNF (5231.00639.001.01). A.V. WSL visiting fellowship and IMAGINA project (Prometeo program 2019/110-Generalitat Valenciana). The CEAM is Generalitat Valenciana.
Abstract Ecology must attract and retain diverse talented people to produce innovative research relevant solutions 21st‐century environmental problems. Careers culture form the foundation of scientific advancement, substantial progress has been made over recent decades in both realms. Yet, important challenges persist expanding career paths, inclusion underrepresented groups, communication with public. The ESA Student Section organized a horizon scanning exercise address following goals: (1)...
In dealing with predicted changes in environmental conditions outside those experienced today, forest managers and researchers rely on process-based models to inform physiological processes predict future growth responses. The carbon oxygen isotope ratios of tree-ring cellulose (δ13 Ccell , δ18 Ocell ) reveal long-term, integrated responses conditions. We incorporated a submodel into the widely used Physiological Principles Predicting Growth (3-PG) model for first time, complement recently...
Dwarf mistletoes, obligate, parasitic plants with diminutive aerial shoots, have long-term effects on host tree water relations, hydraulic architecture and photosynthetic gas exchange can eventually induce death. To investigate the (1886–2010) impacts of dwarf mistletoe growth characteristics western hemlock, we compared diameter tree-ring cellulose stable carbon (C) oxygen (O) isotope ratios (δ13Ccell, δ18Ocell) heavily infected uninfected trees. The relative basal area trees was...
Discovering widespread microbial processes that create variation in soil carbon (C) cycling within ecosystems may improve C modeling. Toward this end, we screened 206 communities decomposing plant litter a common garden microcosm environment and examined features linked to divergent patterns of flow. flow was measured as dioxide (CO2) dissolved organic (DOC) from 44-days decomposition. Two large groups representing 'high' 'low' DOC phenotypes original 44-day samples were down-selected for...
Examining factors that influence seedling establishment is essential for predicting the impacts of climate change on tree species' distributions. Seedlings originating from contrasting climates differentially express functional traits related to water and nutrient uptake drought resistance reflect their origin responses drought. Soil microbes may improve because they can enhance resistance. However, relative soil expression these between families or populations unknown. To determine if alter...
Plants rely on a diverse rhizobiome to regulate nutrient acquisition and plant health. With increasing severity frequency of droughts worldwide due climate change, untangling the relationships between plants their rhizobiomes is vital maintaining agricultural productivity protecting ecosystem diversity. While some physiological responses drought are generally conserved, patterns root exudation (release small metabolites shown influence microbes) consequential effects can differ widely across...
Abstract Non‐native annual grasses have invaded western rangelands in the United States, and novel approaches are needed to supplement existing management strategies. The aim of this study was investigate biofumigation, use Brassicaceae products suppress weeds, as a control for two non‐native (cheatgrass, Bromus tectorum ventenata, Ventenata dubia ) its effects on dominant native perennial (bluebunch wheatgrass, Pseudoroegneria spicata Idaho fescue, Festuca idahoensis ). We tested effect...