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A neglected transport of plastic debris to cities from farmland in remote arid regions

文献类型： 外文期刊

作者： Yang, Zhan 1 ; Lu, Fan 1 ; Zhang, Hua 1 ; Wang, Wei 1 ; Xu, Xiangyu 1 ; Shao, Liming 1 ; Che, Zongxian 3 ; Lu, Binglin 3 ; Ye, Jianfeng 4 ; He, Pinjing 1 ;

作者机构： 1.Tongji Univ, Inst Waste Treatment & Reclamat, Shanghai 200092, Peoples R China

2.Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

3.Gansu Acad Agr Sci, Inst Soil Fertilizer & Water Saving Agr, Lanzhou 730070, Peoples R China

4.Shanghai Acad Environm Sci, Water Res Inst, Shanghai 200233, Peoples R China

关键词： Microplastics; Macroplastics; Mulching film; Wind erosion; Arid farmland; Solid waste

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 807 卷

页码：

收录情况： SCI

摘要： Although microplastics have been investigated in terrestrial environments, the occurrence and transport of microplastics in semiarid regions with serious wind erosion are still limited. We investigated plastic debris, including macroplastics (>5 mm) and microplastics (50 mu m to 5 mm), from twenty semiarid farmlands and then developed a mass flux model to calculate the quantities of plastic debris transport by wind erosion. Finally, the spatial extent of microplastic deposition was estimated. The average abundance of macroplastics increased with duration of mulching film use, whereas the abundance of microplastics did not change significantly (p > 0.05). Moreover, the highest abundance of microplastics among samples was from the farmland using greenhouse, which suggests that wind erosion played an essential role in retention of plastic debris. Besides, the enrichment ratio (ER) which depends on the shape of microplastics is identified to be a key indicator of the mass flux model. The results showed that 6.91-38.11 kg/ha of plastic debris was released by wind in the 25th year after film application, with 6.14 n/m(2) of microplastics settling in February in Xi'an, which is 690 km away from the source. (C) 2021 Elsevier B.V. All rights reserved.

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