土壤与作物2026，Vol.15Issue(1)：43-52,10.DOI:10.11689/sc.2025071701
微塑料对玉米生长、土壤团聚体和氮转化微生物组成的影响
Effects of different microplastics on maize growth,soil aggregate stability and nitrogen turnover
摘要
Abstract
Microplastics(MPs)have attracted increasing attention due to their potential threat to soil ecosystems,while the mecha-nisms by which MPs affect nitrogen cycling within agricultural soil-microbe systems remain insufficiently understood.In this study,two mass concentrations(0.01%and 0.1%,w/w)of polyethylene(PE)and polylactic acid(PLA)MPs were applied in a 45-day maize(Zea mays L.)pot experiment to systematically evaluate the combined effects of MP type and concentration on maize growth,soil aggregate stability,nitrogen nutrients,microbial community composition,and nitrogen-cycling functions.The results show that the 0.1%PLA treatment significantly reduces maize shoot biomass by 11.7%compared with the control(P<0.05),whereas no signif-icant differences are observed for the other treatments.In addition,both PE and 0.1%PLA treatments lead to a significant reduction in root biomass.All MP treatments markedly decrease the geometric mean diameter(GMD)of soil aggregates,and PLA treatment also significantly reduces the mean weight diameter(MWD).In terms of nitrogen dynamics,MPs do not significantly affect total nitrogen(TN)and ammonium nitrogen(NH4+-N)contents,but 0.1%PE and PLA significantly decrease nitrate nitrogen(NO3--N)levels.PE and 0.01%PLA significantly reduce bacterial Shannon diversity,leading to an increased abundance of Acidobacteriota and a decline in key taxa such as Nitrospirota.PE significantly suppresses the abundance of denitrification genes such as narG and nosZ,while 0.01%PLA upregulates nitrogen fixation genes nifH and nifD.This study highlights the potential disruptive effects of MPs on plant growth and nitrogen cycling in farmland soils,providing a theoretical basis for ecological risk assessment in agroe-cosystems.关键词
微塑料/农田土壤/作物生长/团聚体稳定性/土壤微生物群落/氮循环Key words
microplastics/agricultural soil/plant growth/soil aggregate stability/microbial community/nitrogen cycling分类
农业科技引用本文复制引用
关恩,张之钰,高洁,王文锋,刘吉平,武海涛..微塑料对玉米生长、土壤团聚体和氮转化微生物组成的影响[J].土壤与作物,2026,15(1):43-52,10.基金项目
吉林省自然科学基金(20250101048JJ). （20250101048JJ）
