Soil pH restricts the ability of biochar to passivate cadmium: A meta-analysis

文献类型： 外文期刊

第一作者： Wei, Beilei

作者： Wei, Beilei;Peng, Yunchang;Lin, Longxin;Zhang, Dongliang;Wang, Ziting;Wei, Beilei;Peng, Yunchang;Lin, Longxin;Zhang, Dongliang;Wang, Ziting;Yang, Meiyan;Li, Chong;Li, Chong;Jeyakumar, Paramsothy;Lin, Carol Sze Ki;Wang, Hailong;Zhu, Jinning

作者机构：

关键词： Bioavailability; Acidity; Cadmium fractions; Soil properties; Meta-analysis; Biochar

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.3； 五年影响因子：8.2 ）

ISSN： 0013-9351

年卷期： 2023 年 219 卷

页码：

收录情况： SCI

摘要： Soil acidification is the main cause for aggravation of soil cadmium (Cd) pollution. Biochar treatment can increase the soil pH and decrease the Cd availability in soils. However, there is limited information in literature on the comprehensive assessment of the response of Cd fractions to biochar. Therefore, in the present meta-analysis study, we evaluate the response of Cd fractions to biochar application in soils with different pH and to further examine the effect of physicochemical properties of biochar on Cd. Results from the overall analysis indicated that biochar treatment increased the soil pH by 7.0%, thereby decreasing the amount of available Cd (37.3%). In acidic soil, biochar significantly reduced the acid-soluble fraction (Acid-Cd) of Cd by 36.8%, while Oxidizable fraction of Cd (Oxid-Cd, 20.9%) and Residual fraction of Cd (Resid-Cd, 22.2%) were significantly increased. In neutral soils, only Acid-Cd was significantly reduced (33.0%) in the presence of biochar. In alkaline soils, biochar caused significant reduction in Acid-Cd of 12.4% and an increase in Oxid-Cd and Resid-Cd of 26.6% and 47.8%, respectively. Further, our findings showed that biochar with cation exchange capacity >100 cmol+/kg effectively decreased Acid-Cd (32.4%), while biochar with the percentage of hydrogen <2% was more contributory in increasing Resid-Cd (64.3%). These results demonstrate the importance of soil pH in regulating the biological effectiveness of Cd in soil and the complexation between the functional groups of biochar and Cd, and provide key information for the remediation of Cd pollution in soils with different pH by biochar.

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