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

作者：Yikun Wang, Kai Wang, Meng You, Qiudeng Zhang, Danna Chang, Guopeng Zhou, Ting Liang, Tianshu Wang, Jun Nie, Yulin Liao, Yanhong Lu, Jianglin Zhang, Weidong Cao, H Fan · 发表于：Environmental Technology & Innovation · 年份：2025 · DOI：10.1016/j.eti.2025.104456 · 被引用次数：6 · 研究领域：Heavy metals in environment、Aluminum toxicity and tolerance in plants and animals、Agricultural Science and Fertilization

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, protein-like 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% to 68.17% compared to the control. In the combined treatment, Cd concentrations in brown rice were significantly decreased by 88.60% to 94.31%. Compared to individual IMs, the combined application exhibited better performance in Cd reduction. Moreover, the co-utilization 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 organ...