数字农科院2.0

Occurrence and characteristics of microplastics in soils from greenhouse and open-field cultivation using plastic mulch film

文献类型： 外文期刊

作者： Ruimin Qi;Yuanyuan Tang;Davey L. Jones;Wenqing He;Changrong Yan

作者机构：

关键词： Microplastics;Morphology and composition;Planting regions;Plastic mulch film;Spatial distribution

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2023 年 905 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： There is a major knowledge gap concerning the extent of microplastic pollution in agronomic regions of China, which represent a plastic use hotspot. In order to clarify the amendment of agronomic region and plastic film mulching mode to microplastics distribution, the characteristics of microplastics distributed in agricultural soils from three typical regions (Beijing (BJ), Shandong (SD), and Xinjiang (XJ)) with two plastic film mulching modes (greenhouse (G) and conventional field-based film mulching (M)) in China were investigated. Microplastics weight and their response to planting regions were also evaluated in this study. The result showed that the average abundance of microplastics in soils from BJ, SD, and XJ was 1.83 × 104 items kg−1, 4.02 × 104 items kg−1, and 3.39 × 104 items kg−1, and the estimated weight of microplastics per kg of dry soils was 3.12 mg kg−1, 5.63 mg kg−1, and 7.99 mg kg−1, respectively. Microplastics in farmland were mainly of small particle size (50 to 250 μm), with their abundance decreasing with increasing particle size. Among the microplastics detected, polyethylene and polypropylene were the two dominant types present, accounting for 50.0% and 19.7%, respectively. The standard total effect of planting regions on microplastic number and weight was 31.8% and 32.3%, and plastic film mulching modes (G vs. M) could explain 34.4% of the total variation of microplastic compositions with a contribution rate of 65.6% in this study. This research provides key data for an assessment of the environmental risk of microplastics and supports the development of guidelines for the sustainable use of agricultural plastic film. Further, it is necessary to quantify and assess the contribution of other different plastic sources to microplastics in soil. Big data technologies or isotope tracer techniques may be promising approaches.

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