环境工程学报2025，Vol.19Issue(8)：1993-2003,11.DOI:10.12030/j.cjee.202412047
秸秆还田对黑麦草根际土壤养分及细菌群落的影响
Impacts of straw return on soil nutrients and bacterial communities in the rhizosphere of ryegrass
摘要
Abstract
Straw return is an important measure for utilization of agricultural wastes,and thus optimization of straw return methods is critical for alleviating soil degradation,improving the quality of arable land,and promoting sustainable agricultural development.However,systematic research on effects of different straw return methods on soil physicochemical properties,microorganisms,and crop growth is insufficient.In this study,ryegrass was used as a model crop for pot experiments.Based on soil bacterial high-throughput sequencing,redundancy analysis,and partial least squares path modeling(PLS-PM),the differences in soil physicochemical properties,enzyme activities,bacterial communities and crop biomass in response to straw burying(FS),mulching(FG),and charring(TH)were investigated.The influence pathway of straw return on soil nutrient regulation and crop growth was also examined in the present study.The results showed that:1)both direct(FS and FG)and indirect(TH)return of straw to field could improve soil physicochemical properties,and effectively enhanced soil pH,cation exchange capacity(CEC),organic matter(OM),available potassium(AK),and available phosphorus(AP);2)The direct return group showed higher CEC and AP,and the advantages of indirect return to the field in improving soil pH,OM and AK were more evident;3)Straw returning to the field,especially FS,increased soil enzyme activity and bacterial community richness and diversity;different carbon sources led to differentiated bacterial community structures,and the abundance of Ascomycetes,Acidithiobacillus,Green Benders,Anaplasma,and Bacillus abundance showed opposite increasing or decreasing trends in direct and indirect returns to the field soils;and 4)Direct return of straw to the field suppressed ryegrass biomass,but the indirect method significant improved biomass.The result of PLS-PM modeling suggested that ryegrass biomass was affected by multiple pathways,among which the straw decomposition directly inhibited ryegrass biomass.However,the negative effect of straw decomposition on biomass could be reduced by bacterial diversity-mediated pathway and the coupling of the bacterial diversity and the non-biochemical action of biochar.The study showed that both direct(FS and FG)and indirect(TH)returns of straw to the field can improve the property of acidic soil and enhance soil nutrients.Indirect return of straw to the field has the highest potential to improve acidic soil,increase soil carbon storage,improve soil microbial structure,and elevate crop yield.This study provides new perspectives for optimizing the way of returning straw to the field,as well as providing references for maintaining and improving the stability of the microbiological environment of the soil on the farmland.关键词
秸秆还田方式/土壤养分/黑麦草/细菌群落Key words
straw return method/soil nutrients/ryegrass/bacterial community分类
资源环境引用本文复制引用
袁竹青,李湘凌,赵燕,朱芬芬,穆璐璐,蔡诗颖..秸秆还田对黑麦草根际土壤养分及细菌群落的影响[J].环境工程学报,2025,19(8):1993-2003,11.基金项目
安徽省公益性地质工作项目(No.2021g27) （No.2021g27）
