The synergistic utilization of Chinese milk vetch and immobilized materials can reduce Cd bioavailability in paddy soil through strengthening materials adsorption, soil properties and microbial changes

文献类型： 外文期刊

第一作者： Wang, Yikun

作者： Wang, Yikun;Wang, Kai;You, Meng;Zhang, Qiudeng;Chang, Danna;Liang, Ting;Wang, Tianshu;Cao, Weidong;Fan, Hongli;Zhou, Guopeng;Nie, Jun;Liao, Yulin;Lu, Yanhong;Zhang, Jianglin

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关键词： Cadmium; Immobilized materials; Chinese milk vetch; Co-utilization; Mechanism

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 40 卷

页码：

收录情况： SCI

摘要： Immobilized materials (IMs) and Chinese milk vetch (Astragalus sinicus L., MV) have been widely employed to remediate cadmium (Cd) pollution in paddy fields. However, the combined immobilization effect and mechanism of MV with IMs (limestone, biochar, and sepiolite) on soil Cd contamination are unclear. To investigate the combination impact, an adsorption and a pot experiment were conducted. The results revealed that during the decomposition of MV, proteinlike substances were more abundant in the early stages and gradually transformed into humic substances in the later stages. MV enhanced the Cd adsorption capacity of IMs by increasing the abundance of functional groups on their surfaces. Consequently, soil available Cd was significantly reduced by 36.86-68.17 % compared to the control. In the combined treatment, Cd concentrations in brown rice were significantly decreased by 88.60-94.31 %. Compared to individual IMs, the combined application exhibited better performance in Cd reduction. Moreover, the coutilization significantly improved soil fertility (soil organic matter, total nitrogen, etc). These changes contributed to increased soil microbial diversity and soil microbiota stability, particularly in treatments containing MV. Notably, MV significantly improved the abundance of Desulfobacterota which helped to Cd immobilization and it was significantly negatively correlated with Cd availability. Partial least squares path model indicated that soil dissolved organic matter helped to reduce soil Cd availability. The co-utilization could not only strengthen the improvement of soil fertility, but also reduced Cd bioavailability. This study will provide a low-cost and high-efficiency method for the remediation of Cd contamination in paddy soil.

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