|DEL GROSSO, S|
Submitted to: American Society of Agronomy
Publication Type: Abstract Only
Publication Acceptance Date: 10/1/2003
Publication Date: 10/1/2003
Citation: Mosier, A.R., Del Grosso, S., Halvorson, A.D., Parton, W. 2003. Measurement and modeling of soil-atmosphere N20, CH4 and CO2 exchange for net global warming potential in agroecosystems. Agron. Abs. CD-Romm/Computer Program.
Technical Abstract: When appraising the impact of food and fiber production systems on the composition of earth's atmosphere and the 'greenhouse' effect, the entire suite of biogenic greenhouse gases -- carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) -- needs to be considered. Storage of atmospheric CO2 into stable organic fractions in the soil can sequester CO2 while normal crop production practices can produce CO2, generate N2O, and decrease the soil sink for atmospheric CH4. The overall balance between the net exchange of these gases constitutes the net global warming potential (GWP) of a crop production system. N2O emission is typically the single greatest source of GWP. Trace gas flux and soil C storage data from Colorado and Michigan will be compared and contrasted and measures to decrease net GWP from crop production systems will be discussed . The daily version of the CENTURY model (DAYCENT) is used to generalize the field results presented. DAYCENT's use for the U.S. national inventory for N2O from agricultural soils will also be described.