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- W2330112709 abstract "SUMMARY Biogenic nitrogen (N 2 ) and nitrous oxide (N 2 O) accumulations were measured in groundwater, streams and the vadose zone of small agricultural watersheds in the Mid-Atlantic USA. In general, N 2 and N 2 O in excess of atmospheric equilibrium were found in groundwater virtually everywhere that was sampled. Excess N 2 in groundwater ranged from undetectable to 616 μmol N 2 -N/l, the latter representing c . 50% of background N 2 . The N 2 O-N concentrations varied from undetectable to 75 μ m , and usually greatly exceeded values at atmospheric equilibrium (25–30 nM); however, N 2 O was generally 1–10% of excess N 2 . Intermediate levels of deficit and excess N 2 in flowing streams (−65 to +250 μmol N 2 -N/L) resulting from both abiotic and biotic processes were also measured. In vadose zone gases, multiple N 2 /Ar gas profiles were measured which exhibited seasonal variations with below atmospheric values when the soil was warming in spring/summer and above atmospheric values when groundwater was cooling in fall/winter. Both abiotic and biotic processes contributed to the excess N 2 and N 2 O that was observed. The current data indicate that large concentrations of excess N gases can accumulate within soil, groundwater, and streams of agriculturally dominated watersheds. When excess N gases are exchanged with the atmosphere, the net fluxes to the atmosphere may represent an important loss term for watershed N budgets." @default.
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- W2330112709 date "2014-03-13" @default.
- W2330112709 modified "2023-10-02" @default.
- W2330112709 title "Searching for the missing nitrogen: biogenic nitrogen gases in groundwater and streams" @default.
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- W2330112709 doi "https://doi.org/10.1017/s0021859614000070" @default.
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