U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights

Coupling of Carbon and Nitrogen Cycles Critical for Biomass Sustainability
Published: September 29, 2011
Posted: February 23, 2012

A multi-component plant-soil biogeochemical model for the herbaceous energy crop switchgrass was developed and evaluated using data from a long-term bioenergy plantation in the southeastern United States. DOE scientists at Oak Ridge National Laboratory used the model to simulate biomass production, nitrogen dynamics, and carbon sequestration in soils beneath switchgrass over a 30-year period, revealing a strong coupling of carbon and nitrogen dynamics, both above- and below-ground. The lead scientist concluded that the extent to which biogeochemical cycles are coupled is a critical determinant of sustainability in systems where biomass growth and removal occurs annually. More efficient use of nitrogen in the production of biomass deserves further investigation. Based on model simulations, researchers believe that reductions in nitrogen fertilization are possible given rates of organic matter decomposition and soil nitrogen mineralization. Overall, the model simulations reveal a suite of feedbacks and tradeoffs in the production of feedstock for transportation fuels, but the author suggests that long-term production and removal of biomass from switchgrass fields for transportation fuels is possible.

Reference: Garten, C.T., Jr. 2011. "Review and Model-Based Analysis of Factors Influencing Soil Carbon Sequestration Beneath Switchgrass (Panicum virgatum)," BioEnergy Research, DOI: 10.1007/s112155-011-9154-2. (Reference link)

Contact: Mike Kuperberg, SC-23.1, (301) 903-3281, Daniel Stover, SC-23.1, (301) 903-0289
Topic Areas:

  • Research Area: Terrestrial Ecosystem Science
  • Research Area: Carbon Cycle, Nutrient Cycling
  • Research Area: Plant Systems and Feedstocks, Plant-Microbe Interactions
  • Research Area: Sustainable Biofuels and Bioproducts

Division: SC-23.1 Climate and Environmental Sciences Division, BER


BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]

Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]

Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]

Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]

Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]

List all highlights (possible long download time)