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| Impacts of plastic pollution on the stability of farmland soil aggregates |
| Received:September 07, 2022 |
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| KeyWord:plastic pollution;soil aggregates;soil aggregate stability;soil aggregate diameter |
| Author Name | Affiliation | E-mail | | SUN Beiwen | College of Earth Sciences, Jilin University, Changchun 130061, China | | | GONG Wei | Key Laboratory of Aquatic Botanical and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Yuefen | College of Earth Sciences, Jilin University, Changchun 130061, China | | | LIU Zhaoshun | College of Earth Sciences, Jilin University, Changchun 130061, China | zhaoshun@jlu.edu.cn | | LIU Yi | Key Laboratory of Aquatic Botanical and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China | liuyi@wbgcas.cn |
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| Abstract: |
| To explore the effects of plastic pollution on soil aggregates in farmlands, this study was based on large-scale sampling of plastic-contaminated soil and non-plastic-contaminated soil in pairs across China. The aggregate composition of the non-plasticcontaminated soil was measured using both dry and wet sieving methods. The effects of plastic pollution on the stability of farmland soil aggregates were investigated based on the differences in the soil aggregates stability index systems[percentage of aggregate destruction (PAD), mean weight diameter(MWD), geometric mean diameter(GMD) and normalized mean weight diameter(NMWD)]. The results showed that, in terms of aggregate composition, the proportion of >5 mm large mechanically stable aggregates in farmland soil increased, the proportion of <0.25 mm mechanically stable aggregates was reduced, and the proportion of >2 mm large water-stable aggregates was reduced by plastic input, which increased the proportion of <0.053 mm soil particles. Soil plastic pollution significantly increased the MWD and GMD of mechanically stable aggregates, but did not affect the diameter of water-stable aggregates. Soil plastic pollution in farmland significantly increased the PAD of aggregates and reduced the stability of soil structures. The results indicate that the plastic pollution of farmland soil significantly increased the mechanical stability and slightly decreased the water stability of soil macro aggregates. |
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