| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10249650 | Agricultural and Forest Meteorology | 2011 | 12 Pages |
Abstract
⺠We monitored CO2 fluxes using eddy-covariance and soil chambers in two adjacent production fields within four years. ⺠Available light and/or air temperature explained up to 81% of variations in CO2 fluxes during fallow and growing seasons. ⺠Daytime CO2 exchanges over crops depicted hysteresis with available light with greater uptake in mornings than afternoons. ⺠Corn exhibited 1.7-fold greater peak rates of diurnal CO2 uptake and 18% longer duration of CO2 sink periods than soybean. ⺠While corn showed annual net CO2 uptake and neutral system C balance, soybean showed neutral CO2 exchange and C depletion.
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Authors
Guillermo Hernandez-Ramirez, Jerry L. Hatfield, Timothy B. Parkin, Thomas J. Sauer, John H. Prueger,