Submitted to: Soil Science Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 4/30/2004
Publication Date: 10/31/2004
Citation: Kamal, R., Stott, D.E., Smith, D.R., Bucholtz, D.L. 2004. Greenhouse gas emissions immediately following simulated rainfall on a mollisol. Soil Science Society of America Annual Meeting. 2004 CDROM.
Technical Abstract: Croplands may function as either a sink or source for greenhouse gases in the atmosphere depending upon tillage practices, soil temperature, soil water content and climate. The objective of this study was to measure gas fluxes following simulated rainfall from no-till (NT) and conventional-till chisel-disk (CT) field plots with corn-soybean rotation. Gas flux chambers were used for sample collection. Samples were collected before start of rainfall and then 0.5, 1, 3, 6, 24, 48, 72, 96 hours after the start of the rainfall. The rainfall simulator consisted of a single Fulljet square spray nozzle that delivered water at the rate of 100 mm hr*-1 for 30 min. Gas samples were brought to the lab and the CO2, N2O, and CH4 contents were measured by gas chromatograph and fluxes were calculated from the results. Both N2O and CH4 fluxes were minimal. Peak CO2 flux occurred between 24-72 hours after simulated rainfall and started decreasing within 96 hours after rainfall initiation. Soybean plots exhibited greater CO2 fluxes than corn plots over a 96 hour period. Higher peak fluxes of CO2 were produced in CT plots than in the NT plots, irrespective of the type of crop. [GRACEnet Publication]