Clay-hydrochar composites return to cadmium contaminated paddy soil: Reduced Cd accumulation in rice seed and affected soil microbiome

文献类型： 外文期刊

第一作者： He, Lili

作者： He, Lili;Yang, Shengmao;Wang, Yuying;Feng, Yuanyuan;Feng, Yanfang;Feng, Yuanyuan;Wang, Bingyu;Cui, Hongbiao;Feng, Yuanyuan;Sun, Xiaolong;He, Lili;Yang, Shengmao;Wang, Yuying

作者机构：

关键词： Cadmium (Cd) accumulation; Clay-hydrochar composites; Grain yield; Paddy soil; Microbial community

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2022 年 835 卷

页码：

收录情况： SCI

摘要： Excess cadmium (Cd) in rice precipitated by Cd contamination in paddy soils is a global human health threat and rational response is urgently needed. In this study, attapulgite-modified hydrochar (CA) and the montmorillonitemodified hydrochar (CM) were utilized in Cd-contaminated paddy soils at 0.5% (w/w) and 1% (w/w) application rates to investigate the effects of these clay-hydrochar composites on rice growth and soil Cd availability. The results show that the utility of CA and CM resulted in a significant increase in rice yield, especially at 1% application rate, which extended rice yield by 46.7-50.0% compared to 0.5% application rate. This is related to the Cd fixation and nutrient sequestration of the acidic functional groups on the surface of CA and CM. Additionally, CA-1% and CM-1% reduced the Cd concentration in rice seeds by 26.9-28.1% relative to the control. Notably, CA-1% showed the capacity to passivate Cd at the early stage of rice transplanting, lowering the proportion of Cd in the ion exchange state by 41.6% compared to the control, and this passivation effect persisted until the late stage of transplanted rice. The soilmicrobial community consequences showed that CA and CM did not significantly change the horizontal composition of the soil bacterial phylumand species diversity, indicating that CA and CMhad excessive soil microbial adaptability. Moreover, results of correlation and Canonical Correspondence Analysis confirm that microbial genera responded significantly to the soil Cd morphologies, revealing the importance of CA and CM in the remediation of Cd-contaminated soils by influencing microorganisms. Our findings provide clay-hydrochar composites as a low-cost approach to effectively mitigate soil Cd contamination and improve the security and quality of rice.

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