农业环境科学学报2025，Vol.44Issue(8)：1988-1996,9.DOI:10.11654/jaes.2025-0146
麦秸还田对水稻根际土壤活性有机碳组分与细菌多样性的影响
Impacts of wheat straw return on soil labile organic carbon fractions and bacterial diversity in rice rhizosphere
摘要
Abstract
Straw return is a prevalent agricultural practice,yet research on soil characteristics influenced by the interaction between straw and rice roots in paddy soils remains scarce.This study examined two types of rice-wheat rotation soils—high sandy soil from Taizhou,Jiangsu,and yellow clay soil from Yixing,Jiangsu—through greenhouse pot experiments to assess the effects of wheat straw incorporation on soil organic carbon composition and bacterial community diversity in both rhizosphere and bulk during the rice jointing stage.The findings indicated that wheat straw incorporation,compared to the control,increased organic carbon(OC)content in the bulk of high sandy soil and yellow clay soil by 11.4％and 19.0％,respectively,and enhanced dissolved organic carbon(DOC)content by 16.7％and 38.6％,respectively,as well as particulate organic carbon(POC)content by 6.97％and 32.9％,respectively.Furthermore,in rhizosphere soils compared to bulk soils,the OC content increased by 7.48％and 19.0％,the DOC content rose by 68.8％and 28.1％,and the POC content grew by 21.7％and 51.9％for high sandy soil and yellow clay soil,respectively.Notably,the increases in DOC and POC content were more pronounced in rhizosphere soils than in bulk soils for both soil types.Additionally,straw incorporation significantly elevated the easily oxidizable carbon(EOC)content in the rhizosphere and bulk of yellow clay soil by 38.5％and 78.8％,respectively,while significantly reducing microbial biomass carbon(MBC)content in the rhizosphere soils of both soil types.High-throughput sequencing analysis revealed that wheat straw incorporation significantly decreased the observed species and Shannon index of bacteria in the bulk soil and rhizosphere of sandy soil,yet significantly increased these metrics in the bulk of yellow clay soil.Straw incorporation also markedly altered the bacterial community composition in both rhizosphere and bulk soil of the two soil types,significantly increasing the relative abundance of Hydrogenispora in bulk soil and Clostridium sensu stricto 8 in the rhizosphere.Moreover,bacterial community changes in the rice rhizosphere were more pronounced than those in the bulk soil following wheat straw incorporation,with OC,EOC,and POC identified as key factors regulating these changes.In summary,straw incorporation significantly increases the content of active carbon in rice rhizosphere soil and alters the structure of rhizosphere bacterial communities.Moreover,active organic carbon in the soil is a key factor driving the changes in rhizosphere bacterial communities.关键词
秸秆还田/活性有机碳组分/细菌多样性/根际Key words
straw return/labile organic carbon fraction/bacterial community diversity/rhizosphere分类
农业科技引用本文复制引用
程宇,陈佩,陈瑞,王宁,于建光,薛利红..麦秸还田对水稻根际土壤活性有机碳组分与细菌多样性的影响[J].农业环境科学学报,2025,44(8):1988-1996,9.基金项目
国家重点研发计划项目(2021YFC3201503) （2021YFC3201503）
江苏省重点研发计划项目(D21YFD17008)National Key Research and Development Program of China(2021YFC3201503),Key Research and Development Program of Jiangsu Province(D21YFD17008) （D21YFD17008）
