Temporal and Spatial Distribution of Residual Film in Soil Profile under Continuous Film Mulching

文献类型： 外文期刊

第一作者： Yang, Xiaoting

作者： Yang, Xiaoting;Fan, Wei;Wu, Jinggui;Yang, Xiaoting;Lv, Yan;Fan, Wei;Cai, Hongguang;Zhu, Wenyue

作者机构：

关键词： plastic pollution; farmland soil; residual film; distribution characteristics; mulch cycle

期刊名称：SUSTAINABILITY （ 影响因子：3.9； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 15 卷 21 期

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收录情况： SCI

摘要： Plastic pollution in farmland soil has become a significant concern for scientists studying farmland ecosystems. However, the current research focus on the environmental impacts of plastics in soil overlooks crucial factors such as sources, distribution, and persistence. In this study, we examined the distribution of residual film after eight years of film mulching in mid-April 2018. We also assessed changes in spatial distribution from 2018 to 2020. Our findings reveal that eight years of film mulching significantly increased the quantity of agricultural mulch film residues in the soil. The size of residual film fragments varied from 0.25 cm2 to 109 cm2, and the average size, number, and quantity of residues were influenced by soil depth. There was a noticeable downward trend in the quantity of agricultural mulch film residues, decreasing annually by 0.525 kg center dot ha-1. In contrast, the number of residual films showed an average annual growth rate of 2.13 x 105 p center dot ha-1. Importantly, we observed a substantial accumulation of residual film fragments below the 10 cm soil layer over time. Fragments ranging from 1-5 cm2 were the most abundant and gradually accumulated in deeper soil layers, enhancing mulching film recovery efficiency. This study provides valuable insights into the influence of mulch cycles on farmland soil profiles, identifying the key locations and size-to-shape ratios of residual films. These findings serve as a theoretical foundation for implementing effective measures to control mulch film pollution in agricultural practices.

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