A5081111714- Atmospheric and Environmental Gas Dynamics
- Soil Carbon and Nitrogen Dynamics
- Bioenergy crop production and management
- Climate variability and models
- Atmospheric chemistry and aerosols
- Peatlands and Wetlands Ecology
- Biofuel production and bioconversion
- Climate Change Policy and Economics
- Soil and Water Nutrient Dynamics
- Environmental Impact and Sustainability
- Agriculture Sustainability and Environmental Impact
- Forest Biomass Utilization and Management
- Plant Water Relations and Carbon Dynamics
- Climate change impacts on agriculture
- Forest Management and Policy
- Remote Sensing in Agriculture
- Crop Yield and Soil Fertility
- Methane Hydrates and Related Phenomena
- Agricultural Economics and Policy
- demographic modeling and climate adaptation
- Plant Ecology and Soil Science
- Soil Geostatistics and Mapping
- Land Use and Ecosystem Services
- Marine and coastal ecosystems
- Fire effects on ecosystems
Pacific Northwest National Laboratory
2009-2018
Joint Global Change Research Institute
2009-2018
University Research Co (United States)
2010-2017
United States Department of Education
2017
United States Department of Energy
2016
University of Maryland, College Park
2010-2014
University of Tennessee at Knoxville
2010
Oak Ridge National Laboratory
2002-2010
Policy Analysis (United States)
2010
National Technical Information Service
2008-2009
Changes in agricultural management can potentially increase the accumulation rate of soil organic C (SOC), thereby sequestering CO 2 from atmosphere. This study was conducted to quantify potential sequestration rates for different crops response decreasing tillage intensity or enhancing rotation complexity, and estimate duration time over which may occur. Analyses were completed using a global database 67 long‐term experiments, consisting 276 paired treatments. Results indicate, on average,...
Abstract Soil carbon (C) is a critical component of Earth system models (ESMs), and its diverse representations are major source the large spread across in terrestrial C sink from third to fifth assessment reports Intergovernmental Panel on Climate Change (IPCC). Improving soil projections high priority for modeling future IPCC other assessments. To achieve this goal, we suggest that (1) model structures should reflect real‐world processes, (2) parameters be calibrated match outputs with...
Improved practices in agriculture, forestry, and land management could be used to increase soil carbon thereby significantly reduce the concentration of atmospheric dioxide. Understanding biological edaphic processes that retain can lead specific manipulations enhance sequestration. These manipulations, however, will only suitable for adoption if they are technically feasible over large areas, economically competitive with alternative measures offset greenhouse gas emissions, environmentally...
Livestock play an important role in carbon cycling through consumption of biomass and emissions methane. Recent research suggests that existing bottom-up inventories livestock methane the US, such as those made using 2006 IPCC Tier 1 factors, are too low. This may be due to outdated information used develop these factors. In this study, we update for cattle swine by region, based on reported recent changes animal body mass, feed quality quantity, milk productivity, management animals manure....
Marginal lands have received wide attention for their potential to improve food security and support bioenergy production. However, environmental issues, ecosystem services, sustainability been widely raised over the use of marginal land. Knowledge extent, location, quality as well assessment management are limited diverse. There many perceptions about what constitutes so clear definitions needed. This paper provides a review historical development concept, its application assessment....
Abstract We develop an approach for estimating net ecosystem exchange ( NEE ) using inventory‐based information over North America NA a recent 7‐year period (ca. 2000–2006). The notably retains on the spatial distribution of , or vertical between land and atmosphere all non‐fossil fuel sources sinks CO 2 while accounting lateral transfers forest crop products as well their eventual emissions. total estimate −327 ± 252 TgC yr −1 sink was driven primarily by uptake in Forest Lands sector (−248...
This research evaluated differences in yields and associated downside risk from using no‐till tillage practices. Yields 442 paired experiments across the United States were with respect to six crops environmental factors including geographic location, annual precipitation, soil texture, time since conversion no‐till. Results indicated that mean for sorghum [ Sorghum bicolor (L.) Moench] wheat ( Triticum aestivum L.) greater than tillage. In addition, tended produce similar or grown on loamy...
Terrestrial gross primary productivity (GPP) is the largest component of global carbon cycle and a key process for understanding land ecosystems dynamics. In this study, we used GPP estimates from combination eight biome models participating in Inter-Sectoral Impact-Model Intercomparison Project phase 2a (ISIMIP2a), Moderate Resolution Spectroradiometer (MODIS) product, data-driven product (Model Tree Ensemble, MTE) to study spatiotemporal variability at regional levels. We found 2000–2010...
Abstract The potential expansion of biofuel production raises food, energy, and environmental challenges that require careful assessment the impact on greenhouse gas (GHG) emissions, soil erosion, nutrient loading, water quality. In this study, we describe a spatially explicit integrative modeling framework (SEIMF) to understand quantify impacts different biomass cropping systems. This SEIMF consists three major components: (1) geographic information system (GIS)‐based data analysis define...
Net annual soil carbon change, fossil fuel emissions from cropland production, and net primary production were estimated spatially distributed using land cover defined by NASA's moderate resolution imaging spectroradiometer (MODIS) the USDA National Agricultural Statistics Service (NASS) data layer (CDL). Spatially resolved estimates of ecosystem exchange (NEE) balance (NECB) developed. The purpose generating spatial fluxes, objective this research, was to develop a method accounting that is...
An intensive regional research campaign was conducted by the North American Carbon Program (NACP) in 2007 to study carbon cycle of highly productive agricultural regions Midwestern United States. Forty-five different associated projects were across five US agencies over course nearly a decade involving hundreds researchers. One primary objectives investigate ability atmospheric inversion techniques use calibrated CO2 mixing ratio data estimate flux major croplands States comparing results an...
Abstract. Understanding the global carbon (C) cycle is of crucial importance to map current and future climate dynamics relative environmental change. A full characterization C cycling requires detailed information on spatiotemporal patterns surface–atmosphere fluxes. However, relevant observations are highly variable in their coverage reporting standards. Especially problematic lack integration dioxide (CO2) exchange ocean, inland freshwaters land surface with atmosphere. Here we adopt a...
This study presents observations of atmospheric boundary layer CO 2 mole fraction from a nine‐tower regional network deployed during the North American Carbon Program's Mid‐Continent Intensive (MCI) 2007–2009. The MCI region is largely agricultural, with well‐documented carbon exchange available via agricultural inventories. By combining vegetation maps and tower footprints, we show fractional influence corn, soy, grass, forest biomes varies widely across MCI. Differences in magnitude flux...
Abstract Quantification of biogenic carbon fluxes from agricultural lands is needed to generate comprehensive bottom‐up estimates net exchange for global and regional monitoring. We estimated associated with annual crop primary production (NPP), harvested biomass, consumption biomass by humans livestock. These were combined a single estimate spatially distributed 0.05° resolution using Moderate Resolution Imaging Spectroradiometer satellite land cover data. Global NPP in 2011 was at 5.25 ±...
Abstract. Scientific understanding of the global carbon cycle is required for developing national and international policy to mitigate fossil fuel CO2 emissions by managing terrestrial uptake. Toward that as a contribution REgional Carbon Cycle Assessment Processes (RECCAP) project, this paper provides synthesis net land–atmosphere exchange North America (Canada, United States, Mexico) over period 1990–2009. Only considered, not methane or other greenhouse gases. This based on results from...