生态学杂志2025，Vol.44Issue(4)：1170-1180,11.DOI:10.13292/j.1000-4890.202504.030
可降解和不可降解微塑料对滨海湿地土壤有机碳矿化的影响
Effects of degradable and non-degradable microplastics on soil organic carbon mineralization in a coastal wetland soil
摘要
Abstract
Microplastics(MPs),as a kind of emerging pollutant,have been widely found in soils.However,the effect of MPs on the mineralization of soil organic carbon(SOC),especially the difference between degradable and non-degradable MPs,is still unclear.The relevant mechanisms need to be further revealed.In this study,a soil in-cubation experiment(100-day)was conducted with adding degradable polylactic acid-(PLA)and non-degradable polyethylene-(PE)MPs to a coastal wetland soil,respectively.The results showed that,regardless MPs type,MPs addition significantly reduced the cumulative CO2 emissions.Compared with the PLA-MPs,the PE-MPs had stronger inhibitory effect on the cumulative CO2 emissions.Furthermore,the addition of both MPs types significantly increased SOC content and improved the stability of soil aggregates,while remarkably reduced the contents of dis-solved organic carbon,NH4+-N,and NO3--N.In terms of microbial property,the addition of MPs decreased the diversity of soil microbial community and the activity of carbon mineralization associated bacteria and enzymes.The reduction of available substrates for SOC mineralization,the enhancement of physical protection of soil aggregates,and the reduction of SOC mineralization-related bacterium and enzyme activities were identified as the main mecha-nisms for the lower SOC mineralization in MPs added soils.Overall,non-degradable PE-MPs had stronger effect on soil physical,chemical,and microbial indices than degradable PLA-MPs.Our results can provide important data support and theoretical basis for in-depth understanding of the environmental effects of MPs in coastal wetland soils.关键词
微塑料/土壤有机碳矿化/土壤团聚体/细菌群落/酶活性Key words
microplastics/soil organic carbon mineralization/soil aggregate/bacterial community/enzyme activity引用本文复制引用
陈锟,郗敏,陈飞潼,刘书铭,孔范龙,姜志翔..可降解和不可降解微塑料对滨海湿地土壤有机碳矿化的影响[J].生态学杂志,2025,44(4):1170-1180,11.基金项目
国家自然科学基金项目(42177225,42171116)资助. （42177225,42171116）
