稻壳炭添加比例对红壤镉形态转化的动态影响OA

This study investigated the effects of different application rates of rice husk charcoal on Cd speciation distribution and soil pH in Cd-contaminated soil through laboratory cultivation experi-ments.Results indicated that rice husk charcoal significantly increased soil pH,with all treatment groups maintaining higher pH levels than the control group.Concurrently,exchangeable Cd content decreased across all treatment groups.Carbonate-bound Cd continuously increased throughout the in-cubation period in the rice husk charcoal treatment group.Iron-manganese oxide-bound Cd and resi-due-bound Cd also showed a gradual increase trend in the treatment groups.Overall,adding 3％rice husk charcoal yielded the best Cd immobilization and remediation effect in red soil under the experi-mental conditions of this study.