Co-incorporation of wheat straw and hairy vetch reduced soil N2O emission via regulating nitrifier and denitrifier structure on the Qinghai plateau

文献类型： 外文期刊

第一作者： Liu, Rui

作者： Liu, Rui;Chai, Qiang;Jiang, Peng;Zhou, Guopeng;Chang, Danna;Cao, Weidong;Liang, Hao

作者机构：

关键词： Green manure; Co-occurrence network; Denitrifier; Key ecological cluster; Microbial structure; Nitrifier

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：4.9 ）

ISSN： 0929-1393

年卷期： 2024 年 202 卷

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收录情况： SCI

摘要： Introducing green manure is considered a sustainable practice in wheat production on the Qinghai plateau, an ecologically fragile area. However, the regulatory mechanisms governing N2O 2 O emission through green manure and wheat straw co-incorporation in nitrifiers and denitrifiers communities remain unclear. Herein, a microcosm experiment was conducted, including no-addition (CK), hairy vetch (VS), wheat straw (WS), and the mixture of hairy vetch and wheat straw (VWS), to investigate soil N2O 2 O emission and functional microbes communities. Compared with CK, cumulative N2O 2 O emission decreased by 19.1 % and 74.8 % in WS and VWS, whereas it increased by 60.4 % in VS. Residues incorporation increased absolute abundances of denitrifier ( narG , nirK, and nosZ genes) by 39 %-139 % than CK. However, the contribution of structures of functional microbes on N2O 2 O emission overweighed their absolute abundances. The reduced N2O 2 O emission was mainly associated with the decreased relative abundance of M5 and M7 (key ecological cluster, gained from co-occurrence network of narG-- and nirK-types denitrifier, dominant genera were Pseudomonas and Bradyrhizobium), ), and with the increased M13 (from nosZ-type denitrifier, dominant genus was Tardiphaga). ). In N2O 2 O emission peak (the 6th day of incubation), VWS reduced the relative abundance of Pseudomonas by 9.9 % and 11.2 % and Bradyrhizobium by 39.7 % and 49.2 % compared with CK and VS, respectively. Additionally, VWS increased the relative abundance of Tardiphaga by 134.1 % and 172.1 % compared with CK and WS. Our results suggest that wheat straw and hairy vetch co-incorporation is an effective practice to mitigate N2O 2 O emission via regulating key denitrifier taxa on the Qinghai Plateau.

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