数字农科院2.0

Advancing carbon neutrality through innovative soil remediation strategies: Co-application of materials and MnSO4 for cadmium-contaminated paddy soils

文献类型： 外文期刊

作者： Liu, Guofei;Zhang, Yanru;Li, Zhehan;Jiao, Weixiong;Li, Jingfang;Yin, Xiaoyuan;Lin, Dasong

作者机构：

关键词： Cd-contaminated soils;Co-application remediation;Soil health;Rice safety and production;Carbon neutrality

期刊名称： JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

ISSN： 2213-2929

年卷期： 2025 年 13 卷 6 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Traditional heavy metal remediation often relies on high-rate single materials, compromising soil health, incurring high costs, and lacking carbon neutrality considerations. This field study evaluated the synergistic effects of four materials (red mud (RM), kaolin (KL), biochar (BC), and humic acid (HA)) applied with MnSO4 (MS) at ratios of MS(0.075)+materials(1.5/3.0) on Cd mobilization, transformation, and accumulation in paddy soil. Co-application treatments significantly reduced bioavailable Cd concentrations in rhizosphere and bulk soils by increasing soil pH and CEC while decreasing Eh, promoting Cd conversion from acid-soluble to reducible, oxidizable, and residual forms. Furthermore, shifts in microbial community structure enhanced Cd immobilization by influencing the abundance of Desulfobacterota and metal-resistant genera. Critically, the treatments stimulated Fe plaque formation on rice roots and fostered Mn-Cd competition within plant tissues, inhibiting Cd uptake and translocation. The MS(0.075)+materials(3.0) treatment successfully reduced brown rice Cd concentrations below 0.20 mg kg(-1) without adversely affecting rice production, as well as soil physicochemical and biological properties, while MS(0.075)+materials(1.5) did not. Importantly, these co-application strategies demonstrated lower remediation costs compared to single-material applications. The results demonstrate that MS (0.075 %)+materials(3.0 %) treatments provide a cost-effective, low-carbon remediation strategy for Cdcontaminated soils, while reducing material consumption to enhance environmental sustainability and contribute to carbon neutrality goals.

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