A5081552799- Peatlands and Wetlands Ecology
- Coastal wetland ecosystem dynamics
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Botany and Plant Ecology Studies
- Microbial Community Ecology and Physiology
- Soil Carbon and Nitrogen Dynamics
- Anaerobic Digestion and Biogas Production
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Urban, Neighborhood, and Segregation Studies
- Geochemistry and Elemental Analysis
- Crustacean biology and ecology
- Aquatic Invertebrate Ecology and Behavior
- Hydrocarbon exploration and reservoir analysis
- Plant responses to elevated CO2
- Environmental DNA in Biodiversity Studies
- Polar Research and Ecology
- Climate Change Communication and Perception
- Freshwater macroinvertebrate diversity and ecology
- demographic modeling and climate adaptation
- Property Rights and Legal Doctrine
Chapman University
2015-2024
Claremont McKenna College
2023-2024
University of British Columbia
2022
Colorado State University
2022
Chinese Academy of Sciences
2022
Oak Ridge National Laboratory
2022
University of Antwerp
2022
Cardiff University
2022
Manaaki Whenua – Landcare Research
2022
The University of Tokyo
2022
Abstract Peatlands contain one-third of soil carbon (C), mostly buried in deep, saturated anoxic zones (catotelm). The response catotelm C to climate forcing is uncertain, because prior experiments have focused on surface warming. We show that deep peat heating a 2 m-thick column results an exponential increase CH 4 emissions. However, this due solely processes and not degradation peat. Incubations only the top 20–30 cm from experimental plots higher production rates at elevated...
Peatland soils represent globally significant stores of carbon, and understanding carbon cycling pathways in these ecosystems has important implications for global climate change. We measured aceticlastic autotrophic methanogenesis, sulfate reduction, denitrification, iron reduction a bog, an intermediate fen, rich fen the Upper Peninsula Michigan one growing season. In 3‐d anaerobic incubations slurried peat, denitrification were minor components mineralization. Experiments using 14...
Abstract Peatlands contain one-third of the world’s soil carbon (C). If destabilized, decomposition this vast C bank could accelerate climate warming; however, likelihood outcome remains unknown. Here, we examine peatland stability through five years whole-ecosystem warming and two elevated atmospheric dioxide concentrations (eCO 2 ). Warming exponentially increased methane (CH 4 ) emissions enhanced CH production rates throughout entire profile; although surface remain much greater than...
Significance While peatlands have historically stored massive amounts of soil carbon, warming is expected to enhance decomposition, leading a positive feedback with climate change. In this study, unique whole-ecosystem experiment was conducted in northern Minnesota warm peat profiles 2 m deep while keeping water flow intact. After nearly y, enhanced the degradation organic matter and increased greenhouse gas production. Changes quality were accompanied by stimulation methane production...
Peatlands store globally significant amounts of carbon and are important sources the greenhouse gas methane (CH 4 ) to atmosphere. However, for reasons which not well understood, many peatland soils produce smaller CH than theoretically predicted, dioxide (CO 2 produced during anaerobic decomposition in cannot be accounted by commonly measured microbial processes. Here we show that reduction solid‐phase organic matter (i.e., humic substances) suppresses production a bog soil can responsible...
Abstract Increased partitioning of carbon (C) to fine roots under elevated [ CO 2 ], especially deep in the soil profile, could alter C and nitrogen (N) cycling forests. After more than 11 years free‐air enrichment a Liquidambar styraciflua L. (sweetgum) plantation Oak Ridge, TN , USA greater inputs resulted incorporation new (i.e., with depleted δ 13 C) into root‐derived particulate organic matter ( POM ) pools 90‐cm depth. Even though production sweetgum stand was limited by N...
Summary Drainage‐induced encroachment by trees may have major effects on the carbon balance of northern peatlands, and responses microbial communities are likely to play a central mechanistic role. We profiled soil fungal community estimated its genetic potential for decay lignin phenolics (class II peroxidase potential) along peatland drainage gradients stretching from interior locations (undrained, open) ditched (drained, forested). Mycorrhizal fungi dominated across gradients. When moving...
Abstract Climate change will directly affect carbon and nitrogen mineralization through changes in temperature soil moisture, but it may also indirectly rates quality. We used an experimental mesocosm system to examine the effects of 6‐year manipulations infrared loading (warming) water‐table level on potential anaerobic (as dioxide (CO 2 ) methane (CH 4 production) potentials bog fen peat over 11 weeks under uniform conditions. To investigate response dominant methanogenic pathways, we...
Abstract Permafrost thaw in northern ecosystems may cause large quantities of carbon (C) to move from soil atmospheric pools. Because microbial communities play a critical role regulating C fluxes soils, we examined activity and greenhouse gas production soon after permafrost ground collapse (into collapse‐scar bogs), relative the plateau or older features. Using multiple field laboratory‐based assays at site interior Alaska, show that youngest bog had highest CH 4 potential incubations,...
Abstract Environmental changes are anticipated to generate substantial impacts on carbon cycling in peatlands, affecting terrestrial‐climate feedbacks. Understanding how peatland methane (CH 4 ) fluxes respond these changing environments is critical for predicting the magnitude of feedbacks from peatlands global climate change. To improve predictions CH response such as elevated atmospheric CO 2 concentrations and warming, it essential Earth system models include increased realism simulate...
Abstract Methane (CH 4 ) is a potent greenhouse gas (GHG) with atmospheric concentrations that have nearly tripled since pre‐industrial times. Wetlands account for large share of global CH emissions, yet the magnitude and factors controlling fluxes in tidal wetlands remain uncertain. We synthesized flux data from 100 chamber 9 eddy covariance (EC) sites across marshes conterminous United States to assess improve predictions emissions. This effort included creating an open‐source database...
The accumulation of litter or thatch can affect plant community composition by affecting the temperature, nutrient availability, and light availability soil environment, thereby forming a potentially important linkage between recent productivity current ecosystem processes. To investigate importance on fen peatland community, we conducted addition removal experiment in northern Minnesota, USA, 1998 2001. had little effect microenvironmental variables, despite two‐fold increase mass compared...
Future climate change and other anthropogenic activities are likely to increase nutrient availability in many peatlands, it is important understand how these additional nutrients will influence peatland carbon cycling. We investigated the effects of nitrogen phosphorus on aerobic CH 4 oxidation, anaerobic mineralization (as CO 2 production), a bog, an intermediate fen, rich fen Upper Peninsula Michigan. utilized 5‐week laboratory amendment experiment conjunction with 6‐year field...