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

BER Research Highlights


Carbon Cost of Plant Nitrogen Acquisition
Published: January 06, 2016
Posted: July 29, 2016

How is ecosystem growth and carbon sequestration limited by insufficient nitrogen?

The Science
Plants take up carbon from the atmosphere and use that carbon for growth, reproduction, and defenses. Researchers found that plants also use that carbon to acquire nitrogen from various sources—approximately 13 percent of useable carbon (net primary production or NPP) is used for nitrogen acquisition globally (2.4 Pg C yr-1).

The Impact
Most global terrestrial biosphere models do not include the carbon cost of nitrogen acquisition, thereby failing to represent nitrogen limitation to plant carbon dynamics. Much of the uncertainty in the modeled predictions of the future land carbon sink is driven by how these models prescribe nutrient constraints on primary production. Incorporation of these dynamics into global models will lead to improved changes in climate predictions.

Summary
A plant productivity-optimized nutrient acquisition model was integrated into one of the most widely used global terrestrial biosphere models, the Community Land Model (CLM). Global plant nitrogen uptake is dynamically simulated in the coupled model based on the carbon costs of nitrogen acquisition from mycorrhizal roots, non-mycorrhizal roots, symbiotic nitrogen-fixing microbes, and remobilization of nutrients from senescing leaves. Mycorrhizal uptake represented the dominant pathway by which nitrogen is acquired, accounting for about 66 percent of the nitrogen uptake by plants. Overall, the coupled model improves the representations of plant growth limitations globally. Such model improvements are critical for predicting how plant responses to altered nitrogen availability (from nitrogen deposition, rising atmospheric carbon dioxide, and warming temperatures) may impact the land carbon sink.

Contacts (BER PM)
Daniel Stover and Jared DeForest
SC-23.1
Daniel.Stover@science.doe.gov, 301-903-0289; and Jared.DeForest@science.doe.gov, 301-903-1678

(PI Contact)
Joshua B. Fisher
University of California, Los Angeles; Jet Propulsion Laboratory
joshbfisher@gmail.com, 323-540-4569

Funding
Funding was provided by the U.S. Department of Energy, Office of Biological and Environmental Research, Terrestrial Ecosystem Science Program; and the U.S. National Science Foundation’s Ecosystem Science Program.

Publications
Shi, M., J. B. Fisher, E. R. Brzostek, and R. P. Phillips. 2016. “Carbon Cost of Plant Nitrogen Acquisition: Global Carbon Cycle Impact from an Improved Plant Nitrogen Cycle in the Community Land Model,” Global Change Biology 22(3), 1299-1314. DOI: 10.1111/gcb.13131. (Reference link)

Topic Areas:

  • Research Area: Earth and Environmental Systems Modeling
  • Research Area: Terrestrial Ecosystem Science
  • Research Area: Carbon Cycle, Nutrient Cycling

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

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)