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Occurrence of macroplastic debris in the long-term plastic film-mulched agricultural soil: A case study of Northwest China

文献类型： 外文期刊

作者： Wang, Shuying 1 ; Fan, Tinglu 1 ; Cheng, Wanli 1 ; Wang, Lei 1 ; Zhao, Gang 1 ; Li, Shangzhong 1 ; Dang, Yi 1 ; Zhang, Jianjun 1 ;

作者机构： 1.Key Lab Efficient Utilizat Water Resources Drylan, Lanzhou 730070, Gansu, Peoples R China

2.Gansu Acad Agr Sci, Dryland Agr Inst, Lanzhou 730070, Gansu, Peoples R China

关键词： Macroplastic debris; Long-term film mulching; Agriculture soil; Northwest China

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 831 卷

页码：

收录情况： SCI

摘要： Widespread presence of plastic mulch has led to macroplastic (MaP) pollution. While this issue is widely explored in aquatic ecosystems, MaP pollution on land has been neglected. In 2019, we conducted a large-scale survey of MaPs in Northwest China in 0-30 cm soil with long-term mulching. Samples of MaP debris were collected from 67 sites across Gansu, east Qinghai, and north Shannxi Provinces. All visible MaP pieces for each site were separated and weighed. The mass of each MaP piece was calibrated by size measured in digital images. The MaP mass averaged 47.2 kg ha(-1), and the number of MaPs averaged 266.2 pieces ha(-1). The mass and number of MaPs varied from site to site. The mean size of MaPs was 19.5 cm2 piece(-1) or 28.0 mg piece(-1). More importantly, the number of small MaP pieces (< 5 and 5-20 cm(2) piece(-1)) accounted for 76.7% of the total number of MaPs detected, and small-sized plastic debris (< 10 and 10-25 mg piece-1) were detected in 70.1% of the sampling sites. The percentage of small fragments increased before 15-year of mulching and then declined. However, the amount of medium-large debris (20-50 and > 50 cm(2) piece(-1)) showed a trend opposite to that of small fragments. The percentage of MaPs was greater in the small size group than in the medium-large size group. The arid to semi-arid area exhibited higher MaP contamination compared with the semi-arid to the semi-humid area. These observations indicate that plastic debris residing in soil tend to be fragmented, making plastic film recovery more challenging and causing severe soil pollution. Further studies are required to regulate plastic mulch methods and explore the degradation process.

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