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Improved immobilization of soil cadmium by regulating soil characteristics and microbial community through reductive soil disinfestation

文献类型： 外文期刊

作者： Li, Xin 1 ; Li, Xuefeng 1 ; Li, Yueyue 1 ; Dai, Xiongze 2 ; Zhang, Qingzhuang 1 ; Zhang, Mi 1 ; Zhang, Zhuqing 1 ; Tao, Y 1 ;

作者机构： 1.Hunan Acad Agr Sci, Inst Vegetable Res, Changsha 410000, Peoples R China

2.Hunan Agr Univ, Changsha 410000, Peoples R China

3.Dept Agr & Rural Affairs Hunan Prov, Changsha 410000, Peoples R China

4.Atom Energy Author, Nucl Res Ctr, Soil & Water Res Dept, Abou Zaabl 13759, Egypt

关键词： Reductive soil disinfestation; Cadmium contamination; Soil characteristics; Soil microbiota; Co-occurrence network analysis

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2021 年 778 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) contamination arising from industrialization has attracted increasing attention in recent years. Reductive soil disinfestation (RSD) as an effective agricultural practice has been widely applied for soil sterilization. However, there is little research regarding RSD affecting Cd immobilization. Here, five treatments, namely untreated soil (CK), flooding-treated soil (FL), RSD with 2% ethyl alcohol (EA), 2% sugarcane bagasse (SB), and 2% bean dregs (BD) were designed to detect their performance for Cd immobilization in contaminated soils, and the change of soil properties and microbial communities were monitored. The results revealed that pH significantly increased in FL and RSD-treated soils, but was negatively correlated with the exchangeable fraction of Cd (EX-Cd), while Oxidation-Reduction Potential (Eh) significantly decreased in FL and RSD-treated soils, and was positively correlated with EX-Cd. BD treatment might contribute to the increase of CaCO3 as shown by XRay Diffractomer analysis and strongly decreased the EX-Cd in the soil, but increased the relative abundances of Firmicutes, Planctomycetes, Acidobacteria, and Gemmatimonadetes, which may promote Fe (III) reduction or induce resistance to Cd. Bacterial communities at the phylum and genus levels were closely related to Cd fraction. The FL and RSD treatments moderately altered bacterial specific functions, including iron respiration, which may contribute to remediation of Cd-polluted soil by Fe (III) reduction. Field experiments were conducted to confirm that BD treatment resulted in a significant increase in pH whereas the content of total available Cd was reduced in soils. Compared to the control, concentration of total available Cd of red amaranth, sweet potato, towel gourd, and cowpeas were reduced by approximately 46%, 74%, 72%, and 76% in a BD-treated field, respectively. Our study highlights the potential of RSD as an effective method for Cd immobilization in contaminated soils by improving soil characteristics and altering the composition of the microbial community. (c) 2021 Elsevier B.V. All rights reserved.

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