Responses of N2O emissions to straw addition under different tillage soils: A N-15 labelling study

文献类型： 外文期刊

第一作者： Liu, Xiu

作者： Liu, Xiu;Li, Qiaozhen;Liu, Meixia;Hossain, Md Elias;Li, Yuzhong;Liu, Enke;Dong, Wenyi;Liu, Xiu;Li, Qiaozhen;Liu, Meixia;Hossain, Md Elias;Li, Yuzhong;Liu, Enke;Dong, Wenyi;Jia, Shaohui;Hossain, Md Elias;Rachit, Saxena;Gopalakrishnan, Subramaniam

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关键词： No-tillage; Conventional tillage; N-15-labelled straw; N2O emissions; Nitrification and denitrification gene abundance

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：5.1 ）

ISSN： 0929-1393

年卷期： 2023 年 183 卷

页码：

收录情况： SCI

摘要： Nitrous oxide (N2O) emissions contribute to global climate change and are regulated by the intensities of N mineralization, nitrification and denitrification processes. These processes depend on soil management, e.g., tillage and straw addition. Microbial mechanisms underlying the effects of straw addition on N2O emissions were investigated by 56-day incubation of soil from a long-term (27-year) no-tillage (NoTill) and conventional tillage (ConvTill) field experiment. The abundance of N functional genes (amoA, amoB, nirK, nirS and nosZ) in no-tillage and conventional tillage soils was analysed based on straw addition. The application of N-15-labelled straw allowed us to trace N2O sources. Conventional tillage with N-15-labelled straw (ConvTill+Straw) reduced N2O emissions derived from soil by 42 %, whereas no-tillage with N-15-labelled straw (NoTill+Straw) reduced N2O emissions by only 8 % compared with soil without straw addition. The N2O emissions derived from straw were higher under NoTill+Straw than under ConvTill+Straw, whereas they accounted for only similar to 4 % of the total N2O emissions under both conditions. The nirK and nirS gene abundances were higher than those in soil without straw addition. Compared to that under ConvTill, the nosZ gene abundance was higher and the N2O emissions were 40 % lower under ConvTill+Straw, indicating its strong capacity to reduce N2O to N-2. Pathway analysis showed that gene (amoA and nirK) abundance combined with soil properties (particulate organic matter nitrogen (POMN) and NO3) were the main factors affecting N2O emissions, with increased POMN and nirK abundance driving increased N2O production under NoTill+Straw. However, gene (amoA, amoB, nirS and nosZ) abundances affected N2O emissions, with the nosZ gene being the main factor decreasing N2O under ConvTill+Straw. These findings revealed that straw return suppressed N2O emissions in conventional tillage soil, which may mitigate greenhouse gas emissions.

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