生态学报2024，Vol.44Issue(10)：4308-4318,11.DOI:10.20103/j.stxb.202306061191
微塑料对稻田土壤温室气体排放和微生物群落的影响
Effect of microplastics on greenhouse gas emissions and microbial communities in paddy soils
摘要
Abstract
Microplastics have received increasing attention due to their extensive presence in soil environments and the potential ecological risks.The presence of microplastics in soil can alter its physical and chemical properties,impacting the soil microbial communities and the carbon biogeochemical processes it drives.Research in this area is still in its early stages.Biodegradable plastics,as substitutes for traditional plastics,are increasingly being used in agricultural activities and subsequently released into the soil.However,there is scarce research on the impact of biodegradable microplastics on soil microbial characteristics.Based on this,this experiment took the paddy soils in the Sanjiang Plain of China as the research subjects.Two common types of microplastics were selected as experimental materials:conventional microplastic polypropylene(PP)and biodegradable microplastic polylactic acid(PLA).A 41-day microcosm cultivation experiment was conducted to analyze the differential effects of various concentrations and types of microplastics on soil dissolved organic carbon(DOC)content,functional group characteristics,greenhouse gas emissions,and microbial community structure.The results indicated that both PP and PLA had significant impacts on the soil physicochemical properties and microbial communities.In general,the addition of microplastics resulted in an increased content of DOC in the soil,with PLA having a more pronounced effect.Moreover,a significant positive correlation was observed between the increased DOC levels and the amounts of microplastics added.the effect of microplastics on soil DOC was significantly positively correlated with the amount added(P＜0.05).Both PP and PLA influenced the molecular structure of DOC,weakening the degree of soil aggregation and promoting the formation of high molecular weight DOC compounds.The addition of microplastics promoted soil methane(CH4)emissions and effectively inhibited soil carbon dioxide(CO2)emissions.Microplastics in the soil significantly altered the abundance and diversity of soil bacterial and fungal communities.The results of the correlation analysis indicated that the cumulative CO2 emissions were significantly positively correlated with the structural features and hydrophobicity of aromatic compounds(P＜0.05),as well as with the phyla Proteobacteria and Actinobacteria.The results indicated that the addition of microplastics altered soil DOC content and functional group characteristics as well as the microbial environment,thereby influencing soil greenhouse gas emissions.This study can contribute to the current understanding of the ecological risks of microplastics contamination to the soil ecosystems Additionally,it provides a scientific framework for future research on the impact of microplastics on soil geochemistry and microbial characteristics.关键词
温室气体/微塑料/可溶性有机碳/土壤微生物群落Key words
greenhouse gases/microplastics/dissolved organic carbon/soil microbial communities引用本文复制引用
张之钰,武海涛,刘吉平,王文锋,徐磊,张仲胜..微塑料对稻田土壤温室气体排放和微生物群落的影响[J].生态学报,2024,44(10):4308-4318,11.基金项目
吉林省科技发展计划项目(20230101348JC) （20230101348JC）
国家重点研发课题(2022YFF1300900) （2022YFF1300900）
国家自然科学基金课题(U20A2083) （U20A2083）
