Monday, November 13, 2006

Comparison of Simulated and Observed N2O Gas Emission Rates from Bioenergy Cropping Systems.

Paul Adler1, Curtis Dell2, Stephen Del Grosso3, and William J. Parton3. (1) USDA-ARS, USDA-ARS, Building 3702 Curtin Road, University Park, PA 16802, (2) USDA/ARS/PSWMRU Bldg 3702, Curtin Road, University Park, PA 16802, (3) NREL/CSU, 1231 East Drive, Fort Collins, CO 80523, United States of America

Nitrous oxide is the largest greenhouse gas source from crop systems. DAYCENT was used to compare N<sub>2</sub>O emissions from the following 3 bioenergy cropping systems: switchgrass, reed canarygrass, and a rotation of 3 yr corn, 1 yr soybeans, and 4 yr alfalfa. Although DAYCENT did not always capture the observed daily variability in N<sub>2</sub>O emissions, it did simulate the observed seasonal patterns within systems and differences in mean emissions among systems reasonably well.