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Published online 6 July 2006
Published in J Environ Qual 35:1451-1460 (2006)
DOI: 10.2134/jeq2005.0160
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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DAYCENT National-Scale Simulations of Nitrous Oxide Emissions from Cropped Soils in the United States

S. J. Del Grossoa,*, W. J. Partonb, A. R. Mosierc, M. K. Walshd, D. S. Ojimab and P. E. Thorntone

a USDA-ARS-NPA-SPNR, Natural Resources Research Center, 2150 Centre Avenue, Building D, Suite 10, Fort Collins, CO 80526-8119
b Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523
c Agricultural and Biological Engineering, University of Florida, PO Box 110570, Gainesville, FL 32611-0570
d ICF Consulting, 1725 I Street NW, Suite 1000, Washington, DC 20006
e Terrestrial Sciences Section, National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80305


Figure 1
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  		Fig. 1. Sensitivity of calculated DAYCENT N2O emissions factors to soil texture class, mean annual precipitation (low = 480 mm, high = 960 mm), and N fertilizer additions (kg N ha–1).

 

Figure 2
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  		Fig. 2. County-level crop yields based on (a) USDA survey data and (b) DAYCENT simulations for 1997.

 

Figure 3
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  		Fig. 3. County-level mean annual soil (a) N2O emissions and (b) NO3 leaching simulated by DAYCENT for 1990–2003.

 

Figure 4
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  		Fig. 4. Time series for annual direct, indirect, and total anthropogenic N2O emissions for cropped soils in the United States. Emissions are sums of DAYCENT estimates for major crops and Intergovernmental Panel on Climate Change (IPCC, 1997) estimates for remaining crops and Histosols.

 




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