淤泥
土壤碳
环境化学
总有机碳
有机质
污染
土壤有机质
化学
微塑料
碳纤维
环境科学
土壤科学
土壤水分
材料科学
地质学
生态学
复合材料
复合数
生物
古生物学
有机化学
作者
Shuo Liu,Shi-Hua Niu,Lei Xiang,Xin-Di Liao,Si-Cheng Xing
标识
DOI:10.1016/j.jhazmat.2023.131014
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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