Soil N2O production and the delta N-15-N2O value: Their relationship with nitrifying/denitrifying bacteria and archaea during a growing season of soybean in northeast China

文献类型： 外文期刊

第一作者： Xia, Zongwei

作者： Xia, Zongwei;Xu, Hui;Chen, Guanxiong;Dong, Dan;Bai, E.;Xia, Zongwei;Luo, Liangguo

作者机构：

关键词： Nitrous oxide (N2O);N-15 isotope;Ammonia-oxidizing bacteria (AOB);Ammonia-oxidizing archaea (AOA);Denitrification

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：2.846； 五年影响因子：3.618 ）

ISSN： 1164-5563

年卷期： 2013 年 58 卷

页码：

收录情况： SCI

摘要： Nitrous oxide, one of the principal greenhouse gases that can cause global warming, is mainly produced in soil via a series of microbial enzymatic processes. However, source identification of N2O in soil has been a great challenge. In this study, a laboratory incubation experiment was conducted with soils sampled from a soybean field on six sampling dates to evaluate a new approach for identifying soil N2O production processes. The isotopic signatures of soil-emitted N2O, the copy numbers of nitrification- and denitrification-related genes, and some soil properties were monitored simultaneously. Results showed that the soil N2O flux was related to water-filled pore space (WFPS) during the sampling period (r = 0.73, p < 0.01). The delta N-15 values of soil-emitted N2O on the six sampling dates ranged from -11.3 parts per thousand to + 1.6 parts per thousand., and significant differences among these values were found. The delta N-15-N2O values were significantly correlated with the copy numbers of AOB amoA (r = 0.80, p < 0.01) but not with those of AOA amoA. These results suggested that soil WFPS was a determinative factor of N2O production processes, and AOB played a more important role in N2O production in the tested soil. Therefore, the combination of a stable isotopic signature with abundance of the soil microbial community should be a more effective approach to identify soil microbial processes of N2O production. (C) 2013 Elsevier Masson SAS. All rights reserved.

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