Microplastic pollution caused by traditional mulch residues seriously threatens the ecological safety of farmland, while biodegradable mulch film still has microplastic release and soil environmental risks in practical application. In order to evaluate the degradation characteristics of biodegradable films and their long-term impacts on soil environment, this study was conducted to analyze the degradation process of white, silver-black and black films under the conditions of surface soil exposure(0 cm)and deep burial(10 cm)using poly(butylene adipate-co-terephthalate)(PBAT)biodegradable films. The results showed that the degradation of mulch film was significantly higher in the deep soil layer than in the surface layer, while the effect of color on the degradation of mulch film was limited. The microplastics released from broken mulch could change the soil pore structure, resulting in a decrease in soil pH, an increase in soil electrical conductivity(EC), and a decrease in soil organic matter(SOM)content. The results provide a theoretical basis for the scientific application of degradable mulch film and the prevention and control of soil microplastic pollution.- DOI:10.3969/j.issn.1000-1565.2025.05.005PBAT可降解地膜多维度降解行为及其土壤微环境效应冯芳,梁存,黄佳,刘微(河北大学 化学与材料科学学院,河北 保定 071002)摘 要:传统地膜残留引发的微塑料污染严重威胁农田生态安全,而可降解地膜在实际应用中仍存在微塑料释放及土壤环境风险.为评估可降解地膜的降解特性及其对土壤环境的长期影响,本研究以聚己二酸/对苯二甲酸丁二酯可降解地膜为研究对象,分析白色、银黑色和黑色地膜在土壤表层暴露(0 cm)与深层掩埋(10 cm)条件下的降解过程.结果表明,地膜在深层土壤中的降解程度显著高于表层,而颜色对地膜降解的影响有限.地膜破碎后,释放的微塑料可以改变土壤孔隙结构,使土壤pH下降、土壤电导率升高,以及土壤有机质含量降低.本研究成果为可降解地膜的科学应用与土壤微塑料污染防控提供了理论依据.关键词:可降解地膜;表面特征;土壤理化性质;微塑料中图分类号:X53 文献标志码:A 文章编号:1000-1565(2025)05-0488-09PBAT degradable mulch film multidimensional degradation behavior and soil microenvironment effectFENG Fang,LIANG Cun,HUANG Jia,LIU Wei(College of Chemistry and Materials Science, Hebei University, Baoding 071002,China)Abstract: Microplastic pollution caused by traditional mulch residues seriously threatens the ecological safety of farmland, while biodegradable mulch film still has microplastic release and soil environmental risks in practical application. In order to evaluate the degradation characteristics of biodegradable films and their long-term impacts on soil environment, this study was conducted to analyze the degradation process of white, silver-black and black films under the conditions of surface soil exposure(0 cm)and deep burial(10 cm)using poly(butylene adipate-co-terephthalate)(PBAT)biodegradable films. The results showed that the degradation of mulch film was significantly higher in the deep soil layer than in the surface layer, while the effect of color on the degradation of mulch film was limited. The microplastics released from broken mulch could change the soil pore structure, resulting in a decrease in soil pH, an increase in soil electrical conductivity(EC), and a decrease in soil organic matter(SOM)content. The results provide a theoretical basis for the scientific application of degradable mulch film and the prevention and control of soil microplastic pollution.- 收稿日期:2025-01-25;修回日期:2025-03-05 基金项目:国家自然科学基金项目(42077369) 第一作者:冯芳(2001—),女,河北大学在读硕士研究生,主要从事可降解微塑料的光老化和土壤降解方向的研究. E-mail:flf0123ff@126.com 通信作者:刘微(1980—),女,河北大学教授,主要从事土壤污染防治及修复方向的研究.E-mail:uhlw80@126.com 第5期冯芳等:PBAT可降解地膜多维度降解行为及其土壤微环境效应河北大学学报(自然科学版) 第45卷
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