文献类型：期刊文献

英文题名：Effect of Biodegradable Microplastics and Cd Co-Pollution on Cd Bioavailability and Plastisphere in Soil-Plant System

作者：Shao, Xuechun[1]; Shen, Cheng[1,2]; Peng, Cheng[1,3]; Gong, Kailin[1]; Qiao, Zhihua[1]; Zhang, Wei[1]

机构：[1] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] State Environmental Protection Engineering Center for Urban Soil Contamination Control and Remediation, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China; [3] Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240270638)

语种：英文

外文关键词：Biochemistry - Biodegradable polymers - Biodegradation - Elastomers - Microorganisms - Microplastic - Organic carbon - Soil pollution - Soils

摘要：Biodegradable plastics (BPs) are regarded as ecomaterials and are emerging as a substitute for traditional non-degradable plastics. However, the information on the interaction between biodegradable microplastics (BMPs) and cadmium (Cd) in agricultural soil is still limited. Here, lettuce plants were cultured in BMPs (polylactic acid (PLA) MPs and poly(butylene-adipate-co-terephthalate) (PBAT) MPs) and Cd co-polluted soil for 35 days. The results show that diffusive gradient in thin films technique (DGT) but not diethylenetriaminepentaacetic acid (DTPA) extraction method greatly improved the prediction reliability of Cd bioavailability in non-rhizosphere soil treated with BMPs (R2 = 0.860). BMPs increased the Cd bioavailability in non-rhizosphere soil indirectly by decreasing soil pH, cation exchange capacity (CEC), and dissolved organic carbon (DOC), rather than by directly adsorbing Cd on their surface. PLA MPs incubated in rhizosphere soil showed more considerable degradation with extremely obvious cavities and the fracture of ester functional groups on their surface than PBAT MPs. BMPs could provide ecological niches to colonize and induce microorganisms associated with BMPs’ degradation to occupy a more dominant position. In addition, Cd only affected the composition and function of microbial communities in soil but not on BMPs. However, co-exposure to BMPs and Cd significantly reduced the degrees of co-occurrence network of fungal communities on PLA MPs and PBAT MPs by 37.7% and 26.7%, respectively, compared to single exposure to BMPs. ? 2024, The Authors. All rights reserved.