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Central High Plains Conservation Reserve Prog
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Concentration profiles of N2O, a greenhouse gas, and the conservative trace gases SF6 and the chlorofluorocarbons CFC-11, CFC-12, CFC-113, and were measured periodically through thick vadose zones at nine sites in the U.S. High Plains. The CFC and SF6 measurements were used to calibrate a one-dimensional gas diffusion model, using the parameter identification program UCODE. The calibrated model was used with N2O measurements to estimate average annual N2O flux from both the root zone and the deep vadose zone to the atmosphere. Estimates of root-zone N2O fluxes from three rangeland sites ranged from near 0 to about 0.2 kg N2O-N ha−1 yr−1, values near the low end of the ranges determined for native grass from other...
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