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Effects of the oversized microplastic pollution layer on soil aggregates and organic carbon at different soil depths

文献类型： 外文期刊

作者： Liu, Shuo 2 ; Niu, Shi-Hua 2 ; Xiang, Lei 4 ; Liao, Xin-Di 2 ; Xing, Si-Cheng 1 ;

作者机构： 1.South China Agr Univ, Integrat Microbiol Res Ctr, Guangzhou 510642, Peoples R China

2.South China Agr Univ, Coll Anim Sci, Guangzhou 510642, Guangdong, Peoples R China

3.Minist Agr, Guangdong Prov Key Lab Agroanim Genom & Mol Breedi, Guangzhou 510642, Guangdong, Peoples R China

4.Minist Agr, Key Lab Chicken Genet Breeding & Reprod, Guangzhou 510642, Guangdong, Peoples R China

5.Natl Local Joint Engn Res Ctr Livestock Breeding, Guangzhou 510642, Guangdong, Peoples R China

6.Minist Educ, Engn Res Ctr Trop & Subtrop Aquat Ecol Engn, Guangzhou 510632, Guangdong, Peoples R China

关键词： Oversized microplastics; Soil aggregates; Soil organic carbon; Carbon metabolism genes; Carbon metabolism microbe

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 450 卷

页码：

收录情况： SCI

摘要： Soil aggregates (SAs) are the main site for soil organic carbon (SOC) fixation, and land plastic pollution is increasingly causing many soil problems. The effects of plastic on SAs and SOC seem to be significant, but there is still a lack of relevant research. This study investigated the effects of the "plastic contamination layer" (PCL) formed by the microplastic precursors (namely, oversized microplastics (OMPs)) on the content and properties of SAs of different particle sizes at different soil depths. The results showed that the PCL had an effect on SAs of different sizes at different depths: Compared with the control group, PCL mainly increased the content of SAs in 0-5 cm soil depth, about 28.08 mg macroaggregates, 13.79 mg microaggregates and 59.82 mg silt and clay aggregates per gram of soil. The presence of the PCL mainly down-regulates the organic carbon (OC) content in 0-5 cm macroaggregates, which is about 9.59 g/kg, the OC content in 10-20 cm microaggregates, which is about 16.41 g/kg, and the OC content in 0-5 cm silt and clay aggregates, which is about 4.16 g /kg, downregulated the expression of the key carbon metabolism genes (CMGs) coxL, and inhibited the contribution of the potential CMGs host bacteria Sphaerimonospora and Bacteroides to soil organic matter. This paper emphasizes that the presence of PCL reduced SOC sequestration.

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