根际
化学
镉
生物利用度
环境化学
微塑料
农学
土壤pH值
土壤水分
大块土
土壤生物学
细菌
生物
生态学
生物信息学
遗传学
有机化学
作者
Meng Zhao,Li Xu,Xuexia Wang,Congping Li,Yujie Zhao,Bing Cao,Caigui Zhang,Jiajia Zhang,Jiachen Wang,Yanhua Chen,Guoyuan Zou
标识
DOI:10.1016/j.jhazmat.2023.130788
摘要
Combined pollution from microplastics (MPs) and cadmium (Cd) can influence soil environment and soil biota, altering plant growth and development, and Cd mobilization. We investigated the effects of polystyrene (PS) and polypropylene (PP) MPs alongside Cd on soil Cd bioavailability, rhizosphere soil metabolomics, bacterial community structure, and maize (Zea mays L.) growth in two soil types (red soil and cinnamon soil). Although the addition of PS/PP-Cd promoted Cd accumulation in maize plants overall, there were large-particle-size- and small-particle-size-dependent effects in the red soil and cinnamon soil, respectively. The difference is mainly due to the capacity of the large particle size MPs to significantly reduce soil pH, improve soil electrical conductivity (EC), promote active Cd, and intensify Cd mobilization in red soil. In contrast, small-size MPs in cinnamon soil promoted the synthesis and secretion of rhizosphere amino acids and soil metabolites, thus promoting Cd absorption by maize roots. Soil microorganisms also improved Cd bioavailability via C-related functional bacteria. Overall, our study provides novel insights on the potential effects of combined MPs and Cd pollution on soil ecology and agricultural production, enhancing our understanding of rhizosphere metabolites in different soils.
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