5.5
Seasonal and interannual variability of ecosystem respiration in maize-soybean cropping systems
Andrew E. Suyker, University of Nebraska, Lincoln, NE; and S. B. Verma
Fluxes of CO2, water vapor and energy are being measured year-round in maize-soybean agroecosystems in eastern Nebraska employing tower eddy covariance instrumentation. CO2 flux data are used to calculate ecosystem respiration at two study sites: rainfed maize-soybean rotation and irrigated maize-soybean rotation. Ecosystem respiration from the maize and soybean crops varied from about 800 to 1200 g C m-2 annually. A detailed discussion of the magnitudes of ecosystem respiration in these cropping systems during the growing season and “non-growing season” periods will be presented. Results will be compared with data from other ecosystems. An examination of key biophysical controlling factors will also be presented. .
Session 5, Net CO2 Exchange
Thursday, 25 May 2006, 1:00 PM-5:15 PM, Rousseau Suite
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