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- W2136511580 abstract "Concentration profiles of N 2 O, a greenhouse gas, and the conservative trace gases SF 6 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 SF 6 measurements were used to calibrate a one‐dimensional gas diffusion model, using the parameter identification program UCODE. The calibrated model was used with N 2 O measurements to estimate average annual N 2 O flux from both the root zone and the deep vadose zone to the atmosphere. Estimates of root‐zone N 2 O fluxes from three rangeland sites ranged from near 0 to about 0.2 kg N 2 O‐N ha −1 yr −1 , values near the low end of the ranges determined for native grass from other studies. Estimates of root‐zone N 2 O fluxes from two fields planted to corn ( Zea mays L.) of about 2 to 6 kg N 2 O‐N ha −1 yr −1 are similar to those determined for corn in other studies. Estimates of N 2 O flux from Conservation Reserve grassland converted from irrigated corn indicate that production of N 2 O is substantially reduced following conversion from cropland. Small N 2 O fluxes from the water table or from deep in the vadose zone occurred at three sites, ranging from 0.004 to 0.02 kg N 2 O‐N ha −1 yr −1 . Our estimates of N 2 O flux represent space‐ and time‐averaged values that should be useful to more fully evaluate the significance of instantaneous point flux measurements." @default.
- W2136511580 created "2016-06-24" @default.
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- W2136511580 date "2007-08-01" @default.
- W2136511580 modified "2023-09-27" @default.
- W2136511580 title "Nitrous Oxide Fluxes from Cultivated Areas and Rangeland: U.S. High Plains" @default.
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- W2136511580 doi "https://doi.org/10.2136/vzj2006.0164" @default.
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