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Is mulch film itself the primary source of meso- and microplastics in the mulching cultivated soil? A preliminary field study with econometric methods

文献类型： 外文期刊

作者： Xu, Li 1 ; Xu, Xiangbo 2 ; Li, Chang 2 ; Li, Jing 2 ; Sun, Mingxing 2 ; Zhang, Linxiu 2 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Qual Stand & Testing Technol, Beijing 100097, Peoples R China

2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

3.Beijing Municipal Key Lab Agr Environm Monitoring, Beijing 100097, Peoples R China

4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： Meso- and microplastics; Mulch film; Source; Cultivated soil; Econometrics

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：9.988； 五年影响因子：10.366 ）

ISSN： 0269-7491

年卷期： 2022 年 299 卷

页码：

收录情况： SCI

摘要： There has been an increasing interest in the pollution caused by meso-and microplastics (MMPs) in terrestrial ecosystems. Mulch film was once considered to be the most important source of MMPs in the mulching cultivated soil. However, the academic community has not given sufficient scientific evidence. In this study, stratified random sampling method was used to selectively interview households in Hebei province, China (400 house-holds, 20 villages, 5 counties). Finally, household characteristics and mulch film use behavior of 41 households were collected, and corresponding soil samples were sampled. The results showed that 1) the abundance of MMPs was 29.3 +/- 33.1 items.kg(-1) (DW) and the particle size of MMPs was 2.95 x 10(3)+/- 1.75 x 10(3) mu m, and the proportion of MMPs derived from Polyethylene (PE) was only 18.8%; 2) the mass of MMPs was 2.90 +/- 3.72 mg kg(-1) (DW) and the proportion of PE MMPs was 43.75%, which has the highest mass percentage; 3) After con-trolling the endogenous and dummy variables, the use history of mulch film (HistMF) was found to be positively correlated to the abundance of MMPs and inversely correlated to the particle size, but nor with the mass of MMPs; 4) Regarding the heterogeneous characteristics of MMPs, including particle size, color, shape, and type, the findings found the absence of a significant correlation between HistMF and the abundance and mass of PE. In summary, mulch-derived MMPs are not the primary source of MMPs in the mulching cultivated soil in terms of abundance but probably be in terms of mass.

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