Does Biochar Restrict Cd Migration And Bioaccumulation In a Multi-Species Alkaline Fluvo-Aquic Soil System?

作     者：Li, Dongqin Lai, Changhong Chen, Guikui Zhang, Ru Wen, Dian Wu, Zhichao Li, Furong Shi, Hanzhi Cao, Yiran Wang, Xu 

作者机构：Institute of Quality Standard and Monitoring Technology for Agro-products Guangdong Academy of Agricultural Sciences Guangzhou501640 China College of Resources and Environment South China Agricultural University Guangzhou510642 China Key Laboratory of Land Surface Pattern and Simulation China Guangdong Medical University China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Cadmium 

摘      要：A soil column experiment was carried out to quantify the migration of cadmium (Cd) in an earthworm-wheat-soil multi-species system (MS·3). Two fluvo-aquic soils, one from Henan and the other from Beijing, were packed in the upper (0–20 cm) and lower layers (20–50 cm) of the soil columns, respectively. Five treatments were set up: CK (no wheat and no earthworm), W (only wheat), E (only earthworm), W+E (wheat and earthworm), and B+W+E (biochar, wheat, and earthworm). The results showed that biochar application in the earthworm-wheat-soil system increased soil pH, soil water retention, and earthworm Cd concentration but reduced Cd availability in soil, wheat growth and Cd translocation factor, earthworm survival rate, and earthworm average weight change rate. Due to the adsorption by biochar, the majority of Cd (64.39%) stayed in the 0–20 cm soil layer, with approximately 35.51%, 0.08%, and 0.02% of the total Cd being found in the 20–50 cm soil layer, earthworms, and wheat plants, respectively, in the B+W+E treatment. Compared to W+E, the proportions of total Cd found in the earthworms and 0–20 cm soil layer were 84.44% and 6.79%, respectively, higher, whereas that in the 20–50 cm soil layer was 10.52% lower B+W+E. In contrast, the proportions in wheat plants were very close between the two treatments. These results demonstrated that biochar immobilized Cd in the upper layer and reduced Cd leaching to the lower layer in the MS·3 system. However, biochar application increased Cd accumulation in the earthworms and led to wheat growth reduction. Therefore, this research provides new basic data on the potential ecological risks of biochar application to soil systems. © 2024, The Authors. All rights reserved.