A5037137838- Soil Carbon and Nitrogen Dynamics
- Mycorrhizal Fungi and Plant Interactions
- Plant Water Relations and Carbon Dynamics
- Ecology and Vegetation Dynamics Studies
- Forest Ecology and Biodiversity Studies
- Peatlands and Wetlands Ecology
- Tree-ring climate responses
- Plant responses to elevated CO2
- Forest ecology and management
- Climate variability and models
- Plant nutrient uptake and metabolism
- Organometallic Complex Synthesis and Catalysis
- Atmospheric and Environmental Gas Dynamics
- Plant and animal studies
- Forest Management and Policy
- Remote Sensing in Agriculture
- Legume Nitrogen Fixing Symbiosis
- Fire effects on ecosystems
- Microbial Community Ecology and Physiology
- Plant responses to water stress
- Plant Parasitism and Resistance
- Land Use and Ecosystem Services
- Remote Sensing and LiDAR Applications
- Soil and Water Nutrient Dynamics
- Synthesis and characterization of novel inorganic/organometallic compounds
Indiana University Bloomington
2016-2025
Indiana University
2012-2024
National Museum of Natural History
2020
ForestGEO
2020
Universiti Brunei Darussalam
2020
California Institute of Technology
2020
Jet Propulsion Laboratory
2020
Eugene O'Neill Theater Center
2015-2019
University of Florida
2018
John Wiley & Sons (United States)
2016
The degree to which rising atmospheric CO(2) will be offset by carbon (C) sequestration in forests depends part on the capacity of trees and soil microbes make physiological adjustments that can alleviate resource limitation. Here, we show for first time mature exposed enrichment increase release soluble C from roots soil, such increases are coupled accelerated turnover nitrogen (N) pools rhizosphere. Over course 3 years, measured situ rates root exudation 420 intact loblolly pine (Pinus...
Fungi relieve nitrogen limitation Rising concentrations of atmospheric CO 2 stimulate plant growth; an effect that could reduce the pace anthropogenic climate change. But plants also need for growth. So far, experimental addition has had equivocal effects on magnitude fertilization. Terrer et al. explain impact growth depends relationship between availability and symbioses with mycorrhizal soil fungi. Only ectomycorrhizal fungi associated their roots can overcome limitation. Science , this...
Ecology Letters (2011) 14: 349–357 The earth’s future climate state is highly dependent upon changes in terrestrial C storage response to rising concentrations of atmospheric CO2. Here we show that consistently enhanced rates net primary production (NPP) are sustained by a C-cascade through the root-microbe-soil system; increases flux belowground under elevated CO2 stimulated microbial activity, accelerated rate soil organic matter decomposition and tree uptake N bound this SOM. This process...
Abstract Aim To examine the contribution of large‐diameter trees to biomass, stand structure, and species richness across forest biomes. Location Global. Time period Early 21st century. Major taxa studied Woody plants. Methods We examined large density, biomass using a global network 48 (from 2 60 ha) plots representing 5,601,473 stems 9,298 210 plant families. This was assessed three metrics: largest 1% ≥ 1 cm diameter at breast height (DBH), all DBH, those rank‐ordered that cumulatively...
A common finding in multiple CO(2) enrichment experiments forests is the lack of soil carbon (C) accumulation owing to microbial priming 'old' organic matter (SOM). However, C losses may also result from accelerated turnover 'young' tissues that are rich nitrogen (N) relative bulk SOM. We measured root-induced changes dynamics a pine forest exposed elevated and N by combining stable isotope analyses, molecular characterisations SOM assays. find strong evidence root-derived under sufficient...
Maintaining tree diversity Negative interaction among plant species is known as conspecific negative density dependence (CNDD). This ecological pattern thought to maintain higher in the tropics. LaManna et al. tested this hypothesis by comparing how changes with intensity of local biotic interactions tropical and temperate latitudes (see Perspective Comita). Stronger specialized seem prevent erosion biodiversity forests, not only limiting populations common species, but also strongly...
Abstract Predicted increases in temperature and aridity across the boreal forest region have potential to alter timber supply carbon sequestration. Given widely-observed variation species sensitivity climate, there is an urgent need develop species-specific predictive models that can account for local conditions. Here, we matched growth of 270,000 trees a 761,100 km 2 with detailed site-level data quantify responses seven most common tree Eastern Canada changes climate. Accounting...
Abstract When stressed by low soil water content (SWC) or high vapor pressure deficit (VPD), plants close stomata, reducing transpiration and photosynthesis. However, it has historically been difficult to disentangle the magnitudes of VPD compared SWC limitations on ecosystem‐scale fluxes. We used a 13 year record eddy covariance measurements from forest in south central Indiana, USA, quantify how photosynthesis respond fluctuations versus SWC. High both explained reductions relative its...
Abstract. Plant roots release a wide range of chemicals into soils. This process, termed root exudation, is thought to increase the activity microbes and exoenzymes they synthesize, leading accelerated rates carbon (C) mineralization nutrient cycling in rhizosphere soils relative bulk The nitrogen (N) content microbial biomass may introduce stoichiometric constraint on ability effectively utilize exudates, particularly if exudates are rich C but low N. We combined theoretical model with an...
Abstract Projected changes in temperature and drought regime are likely to reduce carbon (C) storage forests, thereby amplifying rates of climate change. While such reductions often presumed be greatest semi‐arid forests that experience widespread tree mortality, the consequences may also important temperate mesic Eastern North America ( ENA ) if growth is significantly curtailed by drought. Investigations environmental conditions determine sensitivity critically needed accurately predict...
Abstract Forest soils store large amounts of carbon (C) and nitrogen (N), yet how predicted shifts in forest composition will impact long‐term C N persistence remains poorly understood. A recent hypothesis predicts that under trees associated with arbuscular mycorrhizas ( AM ) less than dominated by ectomycorrhizas ECM ), due to slower decomposition ‐dominated forests. However, an incipient systems rapid decomposition—e.g. most forests—enhance soil organic matter SOM stabilization...
Summary Although it is increasingly being recognized that roots play a key role in soil carbon (C) dynamics, the magnitude and direction of these effects are unknown. Roots can accelerate C losses by provisioning microbes with energy to decompose organic matter or impede enhancing microbial competition for nutrients. We experimentally reduced belowground supply soils via tree girdling, contrasted responses control girdled plots three consecutive growing seasons. hypothesized decreases would...