数字农科院2.0

Plastic mulching in agriculture: Dual effects on soil carbon and enzyme activity versus microplastic and phthalate contamination

文献类型： 外文期刊

作者： Runyu Xue;Qingwen Zhang;Mengni Li;Yulong Shi;Yu Liu;Xinyuan Wei;Yuanke Jiang;Yi Li;Chang Ma

作者机构：

关键词： Enzyme activity;Microbial biomass;Microplastics;Organic carbon;Phthalates

期刊名称： Process Safety and Environmental Protection

ISSN： 0957-5820

年卷期： 2025 年 202 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Agricultural plastic mulch films are widely used to enhance crop yields globally, yet their long-term application raises concerns over microplastic (MP) accumulation and phthalate ester (PAE) pollution in soils. Despite their agronomic benefits, the dual effects of plastic mulching on soil carbon cycling, enzyme activity, and co-occurring MP-PAE pollution remain poorly understood. This study investigates these impacts by analyzing MP-PAE distribution and mulch-induced changes in soil organic carbon (SOC), dissolved organic carbon (DOC), microbial biomass, and enzyme activities across three land-use systems: unmulched fields, open-field mulched plots, and greenhouse mulched systems. The findings revealed that greenhouse mulching boosted SOC by 78.8 %, likely due to MPs acting as recalcitrant carbon sources, whereas open-field mulching reduced DOC by 18.4 %, possibly due to MP-induced shifts in microbial degradation pathways. Mulching further stimulatedβ-glucosidase (BG), N-acetyl-β-glucosaminidase (NAG), and alkaline phosphatase (ALP) activities by 1.27–1.47 fold, indicating enhanced nutrient cycling. However, BG activity showed negative associations with MPs in greenhouse systems (p < 0.05), highlighting potential microbial inhibition at high MP loads. Contrasting effects were observed that mulched soils increased MP abundance by 68.8 % (open field) and 91.3 % (greenhouse). Mulching contained significantly higher PAE concentrations than unmulched controls, with dibutyl phthalate (DBP) and dimethyl phthalate (DMP) constituting 83.3 %-95.8 % of total PAEs., with significant positive correlations between MPs and PAEs (p < 0.01), suggesting accelerated PAE release from aging films. The DMP and DBP levels in mulched soils exceeded U.S. regulatory standards by 24.5–27.5 times and 2.58–4.68 times, respectively. This study underscores the paradox of plastic mulching, while it improves soil fertility through carbon sequestration and enzyme activation, it also exacerbates long-term ecological risks via MP accumulation and PAE pollution. The findings emphasize the urgent need for sustainable mulching strategies that balance agricultural productivity with environmental safety.

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