Institute of Quality Standard and Testing Technology, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China; Beijing Municipal Key Laboratory of Agriculture Environment Monitoring, Beijing, 100097, China.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
Environ Pollut. 2022 Apr 15;299:118915. doi: 10.1016/j.envpol.2022.118915. Epub 2022 Jan 28.
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 households, 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 (DW) and the particle size of MMPs was 2.95 × 10±1.75 × 10 μm, 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 (DW) and the proportion of PE MMPs was 43.75%, which has the highest mass percentage; 3) After controlling 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.
人们对中观和微观塑料（MMPs）在陆地生态系统中造成的污染越来越感兴趣。覆盖薄膜曾被认为是覆盖栽培土壤中 MMPs 的最重要来源。然而，学术界并没有提供足够的科学证据。在这项研究中，采用分层随机抽样法，在中国河北省有选择性地对家庭（400 户，20 个村庄，5 个县）进行访谈。最后，共收集了 41 户家庭的特征和覆盖薄膜使用行为，并采集了相应的土壤样本。结果表明：1）MMPs 的丰度为 29.3±33.1 个·kg（DW），粒径为 2.95×10±1.75×10μm，源自聚乙烯（PE）的 MMPs 比例仅为 18.8%；2）MMPs 的质量为 2.90±3.72mg·kg（DW），PE-MMPs 的比例为 43.75%，质量百分比最高；3）在控制内源性和虚拟变量后，发现覆盖薄膜的使用历史（HistMF）与 MMPs 的丰度呈正相关，与粒径呈负相关，但与 MMPs 的质量无关；4）关于 MMPs 的异质特征，包括粒径、颜色、形状和类型，发现 HistMF 与 MMPs 的丰度和 PE 的质量之间没有显著相关性。综上所述，从丰度上看，覆盖薄膜衍生的 MMPs 不是覆盖栽培土壤中 MMPs 的主要来源，但可能是从质量上看。
