Roles of straw return in shaping denitrifying bacteria in rice rhizosphere soils through effects on root exudates and soil metabolites  

作　　者：Pei Chen Yu Cheng Ning Wang Jian-Guang Yu Ying Zhao Li-Hong Xue 

机构地区：[1]Key Laboratory of Agro-Environment in Downstream of Yangtze Plain,Ministry of Agriculture and Rural Affairs of the People’s Republic of China,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China [2]School of the Environment and Safety Engineering,Jiangsu University,Zhenjiang 212001,China [3]School of the Environment and Safety Engineering,Jinan University,Jinan 212001,China [4]School of Environmental Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China

出　　处：《Soil Ecology Letters》2025年第1期39-51,共13页土壤生态学快报(英文)

基　　金：supported by the National Key Research and Development Project of China(Grant No.2021YFD1700801);the Key Research and Development Project of Jiangsu Province(Grant No.D21YFD17008);the National Natural Science Foundation of China(Grant No.41601261).

摘　　要：Rhizosphere denitrification is affected by straw return.However,the roles of root exudates and soil metabolites in shaping denitrifying bacteria under wheat straw return are relatively unexplored.Here,wheat straw was amended at 2%(w/w)to two paddy soils with different levels of nitrogen for rice cultivation,which altered the denitrifying bacterial community compositions of both soils.However,straw amendment decreased the abundances of the nirS and nosZ genes by 63.7%and 30.3%in the low nitrogen soil from Taizhou(TZ)but increased the nirK,nirS,and nosZ gene abundances by 116%,81.0%,and 155.5%for the high nitrogen soil from Yixing(YX).Correspondingly,straw amendment decreased the relative abundance of root exudates in the categories of amino acids and benzenes for rice cultivated in TZ soil but increased the relative abundance of root exudates in the categories of amino acids for rice grown in YX soil.With elevated root exudates,straw amendment enhanced the relative abundances of many soil metabolites in YX soil such as sorbitol,myristic acid,and pentadecanoic acid,with fold changes>2.These results suggest that straw return may alter the composition of root exudates and soil metabolites thereby affecting rhizosphere denitrifying bacterial communities and function genes.

关 键 词：straw return denitrifying bacteria soil organic carbon root exudates METABOLITES 

分 类 号：S15[农业科学—土壤学]