Distinguishing N2O and N-2 ratio and their microbial source in soil fertilized for vegetable production using a stable isotope method

文献类型： 外文期刊

第一作者： Fang, Fuli

作者： Fang, Fuli;Zheng, Qian;Ding, Junjun;Xu, Chunying;Li, Yuzhong;Li, Yujia;Lin, Wei;Yuan, Dapeng;Lin, Wei;Li, Yuzhong

作者机构：

关键词： N2O reduction; Organic fertilizer; Microbial processes; Vegetable production; Dual isotopocule plot

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2021 年 801 卷

页码：

收录情况： SCI

摘要： Vegetable production systems with excessive nitrogen fertilizer result in severe N2O emission. It is pivotal to identify the source of N2O for reducing N2O emission, but estimating microbial pathways of N2O production is very difficult due to the existence of N2O reduction. A promising tool can address this problem by using delta O-18 and delta N-15(SP) of N2O to construct a dual isotopocule plot. For ascertaining the microbial pathways of N2O production and consumption in soil fertilized for vegetable production, four treatments were set up: urea (U), half urea and half organic fertilizer (UO), organic fertilizer (O) and no fertilizer (NF), and the experiment was carried out continuously for two years. The delta O-18 vs. delta N-15(SP) plot method indicated that the nitrification/fungal denitrification was a dominant in N2O emission, and the U treatment was the highest, followed by OU, O and NF in the both years. Among the different treatments, furthermore, the N2O flux had the same trend, whereas the extent of N2O reduction showed an opposite trend. Overall, inorganic fertilizer enhances nitrification/fungal denitrification and hinders reduction of N2O to N-2, resulting in a larger amount of N2O emission. However, organic fertilizer increases the contribution of denitrification and greatly improves the extent of N2O reduction, which helps to reduce N2O emission. Therefore, organic fertilizer is crucial to reducing N2O emission by enhancing N2O reduction and should be properly applied in production practice. (C) 2021 Elsevier B.V. All rights reserved.

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