The biogeochemical controls of the δ 15N and δ 18O of N2O produced in landfill cover soils

被引:41
作者
Mandernack, KW [3 ]
Rahn, T
Kinney, C
Wahlen, M
机构
[1] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[2] Univ Calif San Diego, Scripps Inst Oceanog, Geosci Res Div, La Jolla, CA 92093 USA
[3] Colorado Sch Mines, Dept Chem & Geochem, Golden, CO 80401 USA
关键词
D O I
10.1029/2000JD900055
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
We document an enrichment of both the delta(18)O(Atm.O2) and delta(15)N(Atm.N2) values of soil-derived N2O collected from landfill cover soils relative to tropospheric N2O. The isotopic values of N2O vary from -5.1 parts per thousand to +19.4 parts per thousand and from +19.0 parts per thousand to +33.5 parts per thousand for delta(15)N(Atm.N2) and delta(18)O(Atm.O2), respectively. A tight linear correlation for delta(18)O(Atm.O2) versus delta(15)N(Atm.N2) is apparent, reflecting coupled microbial processes that produce N2O that may be isotopically enriched or depleted in relation to tropospheric N2O, Several explanations are provided to explain this correlation, including evidence for NH3 limitation during nitrification, which would be expected to diminish isotopic fractionation and consequently result in more enriched isotopic values of N2O. Desiccation effects on nitrification were also observed, which contribute to NH3 limitation and thus could influence the isotopic signature of N2O. Our results indicate that the N2O isotopic composition from soils may vary greatly depending on the season and soil moisture conditions and may at times be enriched in N-15 and O-18 relative to tropospheric N2O.
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页码:17709 / 17720
页数:12
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