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Remediation effectiveness of vermicompost for a potentially toxic metal-contaminated tropical acidic soil in China

文献类型： 外文期刊

作者： Liu, Beibei 1 ; Wu, Chunyuan 1 ; Pan, Pan 1 ; Fu, Yiqing 1 ; He, Zhenli 2 ; Wu, Lin 1 ; Li, Qinfen 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou, Hainan, Peoples R China

2.Univ Florida, Indian River Res & Educ Ctr, Inst Food & Agr Sci, Ft Pierce, FL 34951 USA

3.Minist Agr, Agr Environm Sci Observat & Expt Stn, Danzhou, Hainan, Peoples R China

关键词： Vermicompost; Tropical soil; Potentially toxic metal; Adsorption capacity; CaCl2 extractable

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2019 年 182 卷

页码：

收录情况： SCI

摘要： Potentially toxic metal (PTM) contamination coupled with soil acidification has posed a severe threat to agricultural sustainability of tropical region in the world. In this study, a vermicopomst (VC) produced from vermicomposting cattle manure under tropical environment was applied to remediating a tropical acidic soil in Hainan, China. The effectiveness of VC in reducing available PTMs in soils was evaluated by incubation experiments with a Cd, Cr or Ni spiked soil and a Cd contaminated field soil. The dynamic changes of soil physical, chemical and biological properties after VC amendment were determined to understand the mechanisms of PTM immobilization. The results showed that VC amendment significantly reduced 0.01M CaCl2 extractable amounts of Cd, Ni and Cr in the spiked soils, and CaCl2 extractable Cd was reduced by 49.3% when VC was amended to the Cd contaminated field soil. Thermodynamic studies showed that VC had a high adsorption capacity for Cd, Ni and Cr, with the maximum adsorption (obtained from the Langmuir model) of 33.45, 26.17, and 20.88 mg/g, respectively. The reduction in CaCl2 extractable metals after VC amendment was consistent with the order of maximum adsorption of VC for Cd, Ni, and Cr. Vermicompost amendment increased soil pH by 0.7 to 1.5 units, which is positively related with VC rate, but negatively with the decrease in extractable metals. These results indicates that adsorption of metals onto VC and an increase in soil pH after VC amendment are likely responsible for the decreased availability of Cd, Ni, and Cr in the contaminated soil. In addition, the addition of stable organic substances and subsequent formation of water-stable aggregates may be also beneficial for immobilizing PTMs and improving tropical soil quality.

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