数字农科院2.0

MnSO4-synergized oyster shell powder outperforms rice straw in mediating dual abiotic and microbial pathways for paddy Cd remediation

文献类型： 外文期刊

作者： 刘国飞;;李京芳;;焦位雄;;李烨;;尹晓媛;;林大松

关键词： Cadmium; Soil remediation; Microbial fixing; Passivation; Crop growth

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Amid global urgency to balance circular economy, food security, and soil health in Cd-contaminated paddy soils, sustainable remediation using waste materials and microbial functions is crucial. Traditional in-situ stabilization often fails to align Cd immobilization, ecosystem preservation, and circular economy goals, prompting us to systematically investigate in-situ Cd stabilization. In this study, we innovatively co-applied MnSO4 (MS, 0.075 t ha-1) with waste-derived oyster shell powder (OS, 1.5/3.0 t ha-1) and rice straw (RS, 1.5/3.0 t ha-1), analyzing soil properties, microbial dynamics, Cd speciation, rice Cd accumulation, and agronomic performance. Low-rate combinations (MS(0.075)+OS(1.5), MS(0.075)+RS(1.5)) weakly immobilized Cd via Desulfobacter-driven CdS formation without inducing significant alterations in soil properties. While MS(0.075)+RS(3.0) enriched functional microbes and reduced soil Eh, it failed to lower Cd concentration in brown rice below 0.20 mg kg-1 due to RS-derived DOC. The MS(0.075)+OS(3.0) treatment significantly advanced results: it increased soil pH by 0.41–0.61 units, decreased soil Eh by 28–46 mV, elevated soil CEC by 1.2–1.9 cmol kg-1, and induced Cd(OH)2 and CdS precipitation. This stimulated Fe plaque formation to restrict Cd translocation and enriched a microbial consortium including Desulfobacter (CdS formation), Bacillus (Cd chelation via EPS), Lysobacter (Cd adsorption via siderophores), and Ensifer (Cd-soil complexation). Consequently, acid-soluble Cd decreased by 35.18–38.73%, shifting Cd to stable fractions. Only this combination reduced brown rice Cd below 0.20 mg kg-1 without compromising yield or soil health, establishing a waste-valorized, microbially synergistic remediation framework aligned with circular economy and global food safety goals.

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