Long-term application of organic compost is the primary contributor to microplastic pollution of soils in a wheat-maize rotation

文献类型： 外文期刊

第一作者： Zhang, Jiajia

作者： Zhang, Jiajia;Wang, Xuexia;Zhao, Meng;Zou, Guoyuan;Chen, Yanhua;Li, Zishuang;Zhou, XiaoLin;Li, Hongjie;Ding, Wencheng

作者机构：

关键词： Grain field soil; Long-term organic fertilization; Microplastics accumulation; Vertical distribution; Weathering morphology

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 866 卷

页码：

收录情况： SCI

摘要： Microplastics (MPs) are posing new threats to soil ecosystems. Organic fertilizers are considered as an emerging con-tributor to MPs accumulation in agricultural soils. However, few studies have focused on the MPs fate in soils under long-term organic fertilizer application. Based on an 11-year field test with wheat-maize cropping rotation, this study investigated the characteristics of MPs in pig manure and cow manure composts, and examined the impact of long-term compost application on soil MPs accumulation, surface morphology, and distribution. The MPs contents in pig manure and cow manure composts were 3547 and 4520 items kg-1, respectively. Microplastics abundances in soils under long-term use of these two composts were 144 to 287 and 140 to 316 items kg-1, respectively, which increased significantly with increasing compost application amount and was substantially higher than that in soils without compost. Accumulated soil MPs sourced from long-term compost application were 1.73 x 108 to 7.22 x 108 items ha-1, accounting for 43.0 %-75.9 % of the total, and the contribution value doubled as the compost appli-cation rate doubled. The proportion of MPs <1 mm in composts (31.0 %) was lower when compared with that in compost-amended soils (43.8 %), and size and abundance reduced with increasing soil depth. Microplastics shapes and polymer types in composts and compost-amended soils were similar and mostly included fragments of polyethyl-ene and polypropylene and fibers of polyethylene terephthalate. Microplastics in compost-amended soils showed com-plicated weathered surface morphologies, and soil mineral colloids were attached. These results demonstrate that compost-derived MPs in soils can be gradually weathered and degraded into smaller particles under long-term com-post application. These findings provide key insights into the pollution level of soil MPs with organic fertilizer appli-cation and serve as a scientific basis for developing MPs mitigation measures in agricultural soils.

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