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Exploring the Occurrence Characteristics of Microplastics in Typical Maize Farmland Soils With Long-Term Plastic Film Mulching in Northern China

文献类型： 外文期刊

作者： Zhang, Jiajia 1 ; Zou, Guoyuan 1 ; Wang, Xuexia 1 ; Ding, Wencheng 2 ; Xu, Li 4 ; Liu, Baoyin 5 ; Mu, Yunsen 6 ; Zhu, Xuran 6 ; Song, Lianjie 6 ; Chen, Yanhua 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing, Peoples R China

2.Chinese Acad Agr Sci, Minist Agr, Beijing, Peoples R China

3.Chinese Acad Agr Sci, Rural Affairs Key Lab Plant Nutr & Fertilizer, Inst Agr Resources & Reg Planning, Beijing, Peoples R China

4.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Agr Stand & Testing, Beijing, Peoples R China

5.Pingquan Municipal Bur Agr & Rural Affairs, Chengde, Peoples R China

6.Chengde Acad Agr & Forestry Sci, Chengde, Peoples R China

关键词： microplastics; maize; plastic film mulching; farmland soils; distribution characteristics

期刊名称：FRONTIERS IN MARINE SCIENCE （ 影响因子：5.247； 五年影响因子：5.72 ）

ISSN：

年卷期： 2021 年 8 卷

页码：

收录情况： SCI

摘要： Microplastics pollution has been threatening the global environmental security, in which agricultural activities are considered as a main source of microplastics occurrence in soils. However, little is known about the occurrence characteristics of microplastics in agricultural soils with long-term plastic film mulching. Therefore, the abundance, distribution, and composition of microplastics were investigated by analyzing 225 soil samples collected from typical maize (Zea mays L.) planting zones with and without long-term (>20 years) plastic film mulching in northern China. Microplastics abundance in mulched soils (754 +/- 477 items kg(-1)) was significantly higher than that in non-mulched soils (376 +/- 149 items kg(-1)), which indicated that plastic film mulching contributed half of microplastics in soils. Moreover, microplastics abundance was significantly positively related to the length of time with film mulching applied. The percentage of microplastics <0.5 mm in mulched soils (50.9%) was significantly lower than that in non-mulched soils (62.2%). Microplastics abundance and size in mulched and non-mulched soils decreased with increased soil depth. Most microplastics were fragments of polypropylene, films of polyethylene, and fibers of polyester. The proportion of films in mulched soils was significantly higher than in non-mulched soils, whereas that of fibers was significantly higher in non-mulched soils. This study confirmed that long-term plastic film mulching increases microplastics pollution in agricultural soils, warranting further evaluation of the associated ecological risks of microplastics in soil ecosystems.

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