Carbon dioxide exchange was measured, using the eddy correlation technique, over a tallgrass prairie in northeastern Kansas, U.S.A., during a six-month period in 1987. The diurnal patterns of daytime and nocturnal CO2 fluxes are presented on eight selected days. These days were distributed throughout most of the growing season and covered a wide range of meteorological and soil water conditions. The midday CO2 flux reached a maximum of 1.3 mg m-2 (ground area) s-1 during early July and was near zero during the dry period in late July. The dependence of the daytime carbon dioxide exchange on pertinent controlling variables, particularly photosynthetically active radiation, vapor pressure deficit and soil water content is discussed. The nocturnal CO2 flux (soil plus plant respiration) averaged -0.4 mg m-2 (ground area) s-1 during early July and was about -0.2 mg m-2 s-1 during the dry period.
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Published as Paper No. 9061, Journal Series, Agricultural Research Division, University of Nebraska-Lincoln, U.S.A.
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Kim, J., Verma, S.B. Carbon dioxide exchange in a temperate grassland ecosystem. Boundary-Layer Meteorol 52, 135–149 (1990). https://doi.org/10.1007/BF00123181