Root exudates increased arsenic mobility and altered microbial community in paddy soils

文献类型： 外文期刊

第一作者： Jiang, Ouyuan

作者： Jiang, Ouyuan;Li, Lvyao;Zhai, Weiwei;Zou, Lina;Tang, Xianjin;Xu, Jianming;Zou, Lina;An, Xia;Duan, Guilan;Gustave, Williamson

作者机构：

关键词： Arsenic; Root exudates; Paddy soils; Speciation; Microbial community

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：6.796； 五年影响因子：6.127 ）

ISSN： 1001-0742

年卷期： 2023 年 127 卷

页码：

收录情况： SCI

摘要： Root exudates are crucial for plants returning organic matter to soils, which is assumed to be a major source of carbon for the soil microbial community. This study investigated the influence of root exudates on the fate of arsenic (As) with a lab simulation experiment. Our findings suggested that root exudates had a dose effect on the soil physicochemical properties, As speciation transformation and the microbial community structure at different concentrations. The addition of root exudates increased the soil pH while decreased the soil redox potential (Eh). These changes in the soil pH and Eh increased As and ferrous (Fe(II)) concentrations in soil porewater. Results showed that 40 mg/L exudates addition significantly increased arsenite (As(III)) and arsenate (As(V)) by 541 and 10 times respectively within 30 days in soil porewater. The relative abundance of Fe(III)-reducing bacteria Geobacter and Anaeromyxobacter increased with the addition of root exudates, which enhanced microbial Fe reduction. Together these results suggest that investigating how root exudates affect the mobility and transformation of As in paddy soils is helpful to systematically understand the biogeochemical cycle of As in soil-rice system, which is of great significance for reducing the health risk of soil As contamination. ?? 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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