Effectiveness of Biochar on Cd Migration and Bioaccumulation in a Multi-Species Alkaline Fluvo-Aquic Soil System
文献类型： 外文期刊
作者： Li, Dongqin 1 ; Lai, Changhong 2 ; He, Hongzhi 2 ; Wen, Dian 1 ; Cao, Yiran 1 ; Wu, Zhichao 1 ; Li, Furong 1 ; Shi, Hanzhi 1 ; Wang, Xu 1 ; Chen, Guikui 2 ;
作者机构： 1.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangdong Prov Key Lab Qual & Safety Risk Assessme, Guangzhou 510640, Peoples R China
2.South China Agr Univ, Coll Resources & Environm, Guangzhou 510642, Peoples R China
关键词：
cadmium; biochar; earthworm; wheat; multi-species soil system (MS
期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）
ISSN：
年卷期： 2025 年 15 卷 6 期
页码：
收录情况： SCI
摘要： Cadmium (Cd) contamination in alkaline soils threatens wheat safety in northern China. This study evaluates biochar's dual role in Cd remediation and ecological trade-offs using a multi-species soil system (wheat-earthworm-soil). Biochar (Pennisetum hydridum) was applied to Cd-contaminated alkaline fluvo-aquic soils under controlled conditions. The results revealed that biochar increased soil pH (8.6-9.6) and reduced CaCl2-extractable Cd by 30-45% in the topsoil (0-20 cm), lowering shoot Cd accumulation in wheat by 42-47%. However, alkaline stress from biochar suppressed wheat biomass by 42%, while earthworm Cd concentrations rose 30-45%, correlating with reduced survival (75% vs. 85-87% in controls). Structural equation modeling identified pH-driven chemisorption as the primary Cd immobilization mechanism, yet biochar amplified ecotoxicity to soil fauna. These findings highlight the need for balanced strategies to optimize biochar's benefits in alkaline agroecosystems.
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