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Effects of polyurethane microplastics combined with cadmium on maize growth and cadmium accumulation under different long-term fertilisation histories

文献类型： 外文期刊

作者： Zhao, Meng 1 ; Li, Yifan 2 ; Li, Congping 3 ; Wang, Xuexia 1 ; Cao, Bing 1 ; Zhang, Jiajia 1 ; Wang, Jiachen 1 ; Zou, Guoyuan 1 ; Chen, Yanhua 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

2.Chinese Acad Agr Sci, Key Lab Tea Biol & Resources Utilizat, Minist Agr, Tea Res Inst, 9 South Meiling Rd, Hangzhou 310008, Peoples R China

3.Qujing City Agr Environm Protect Monitoring Stn, Qujing 655000, Yunnan, Peoples R China

关键词： Fertilising treatment; Polyurethane; Cadmium; Phytotoxicity; Rhizosphere environment

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：12.2； 五年影响因子：11.9 ）

ISSN： 0304-3894

年卷期： 2024 年 473 卷

页码：

收录情况： SCI

摘要： Agricultural production uses different types of fertilisation treatments, typically employing the combined application of organic fertiliser (OF) or organic -inorganic fertiliser (OIF) to improve soil quality. When coupled with cadmium (Cd), microplastics (MPs) affect plant growth and Cd accumulation in soils treated with different fertilisers. This study systematically examined the effects of polyurethane (PU) MPs coupled with Cd on the growth characteristics, root metabolite characteristics, rhizosphere bacterial community structure, and Cd bioavailability of maize under different long-term fertilisation treatments and soil types (red/cinnamon soil). The combined effects of PU MPs and Cd on maize growth differed across fertilisation treatments. Under OF, maize plants accumulated more Cd than under OIF. The accumulation of Cd in maize plants in red soil was twice that in cinnamon soil. Under OF, PU MPs promoted Cd activation by decreasing the soil pH, while root metabolites promoted Cd adsorption sites by synthesising specific amino acids, degrading aromatic compounds, and synthesising pantothenic acid and coenzyme A. Under OF, PU MPs can lower the soil pH to promote the activation of cadmium, while root metabolites promote root growth and increase cadmium adsorption sites by synthesizing specific amino acids, degrading aromatic compounds, and synthesizing pantothenic acid and coenzyme A, hereby promoting root Cd absorption. Under OIF, PU MPs act by influencing the biosynthesis of amino acids in root metabolites, enriching energy metabolism pathways, promoting the transport and translocation of mineral nutrients, thereby amplifying the "toxic effects" of Cd. This study provides new insights into the risk assessment of PU MPs and Cd coupling under different fertilisation treatments, and suggests that the prevention and control of combined PU MPs and Cd pollution in red soil under OF treatment should receive more attention in the future.

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