Title

Biogeochemical cycling of C, N, and water in paddy rice agriculture in Monsoon Asia

Abstract

We report latest results of an ongoing project to evaluate the biogeochemical cycling of C, N, and water in paddy rice agriculture in Monsoon Asia. The core project focus is application of the DNDC biogeochemical model to estimate greenhouse gas emissions from paddy rice, and possible impacts of changes in agricultural management on those emissions. Simulations are done at the scale of sub-national political units (county equivalents and/or provinces/states). One effort has been to develop geospatial input data sets of agricultural land use and management, including crop rotations, cropping intensity, water management (irrigated or rainfed), fertilizer use. We have worked with both statistical census data and MODIS space-borne remote sensing data to map paddy rice across the domain. A second effort has been model development for application to rainfed paddy agriculture, and model testing against field data from paddy sites in India. The final thrust is model application across the domain to estimate water use, crop yield, net C-sequestration in soils, and emissions of methane and nitrous oxide.

Publication Date

5-2006

Journal Title

Joint Assembly Meeting, American Geophysical Union

Publisher

American Geophysical Union Publications

Document Type

Conference Proceeding