Chitin and crawfish shell biochar composite decreased heavy metal bioavailability and shifted rhizosphere bacterial community in an arsenic/ lead co-contaminated soil

文献类型： 外文期刊

第一作者： Chen, Hanbo

作者： Chen, Hanbo;Gao, Yurong;Wang, Hailong;Chen, Hanbo;Gao, Yurong;Meng, Jun;Chen, Wenfu;Chen, Hanbo;Dong, Huiyun;Sarkar, Binoy;Song, Hocheol;Li, Jianhong;Bolan, Nanthi;Bolan, Nanthi;Quin, Bert F.;Yang, Xing;Li, Fangbai;Wu, Fengchang;Wang, Hailong

作者机构：

关键词： Engineered biochar; Microbial community; Enzyme activity; Soil remediation; Structural equation model

期刊名称：ENVIRONMENT INTERNATIONAL （ 影响因子：11.8； 五年影响因子：12.4 ）

ISSN： 0160-4120

年卷期： 2023 年 176 卷

页码：

收录情况： SCI

摘要： Sustainable management of ever-increasing organic biowaste and arable soil contamination by potentially toxic elements are of concern from both environmental and agricultural perspectives. To tackle the waste issue of crawfish shells and simultaneously minimize the threat of arsenic (As) and lead (Pb) to human health, a pot trial was conducted using chitin (CT), crawfish shell biochar (CSB), crawfish shell powder (CSP), and CT-CSB com-posite to compare their remediation efficiencies in As/Pb co-contaminated soil. Results demonstrated that addition of all amendments decreased Pb bioavailability, with the greatest effect observed for the CT-CSB treatment. Application of CSP and CSB increased the soil available As concentration, while significant decreases were observed in the CT and CT-CSB treatments. Meanwhile, CT addition was the most effective in enhancing the soil enzyme activities including acid phosphatase, alpha-glucosidase, N-acetyl-beta-glucosaminidase, and cellobio-hydrolase, whereas CSB-containing treatments suppressed the activities of most enzymes. The amendments altered the bacterial abundance and composition in soil. For instance, compared to the control, all treatments increased Chitinophagaceae abundance by 2.6-4.7%. The relative abundance of Comamonadaceae decreased by 1.6% in the CSB treatment, while 2.1% increase of Comamonadaceae was noted in the CT-CSB treatment. Redundancy and correlation analyses (at the family level) indicated that the changes in bacterial community structure were linked to bulk density, water content, and As/Pb availability of soils. Partial least squares path modeling further indicated that soil chemical property (i.e., pH, dissolved organic carbon, and cation exchange capacity) was the strongest predictor of As/Pb availability in soils following amendment application. Overall, CT-CSB could be a potentially effective amendment for simultaneously immobilizing As and Pb and restoring soil ecological functions in contaminated arable soils.

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