Effects of citric acid on arsenic transformation and microbial communities in different paddy soils
文献类型： 外文期刊
作者： Zou, Lina 1 ; Jiang, Ouyuan 2 ; Zhang, Shu 4 ; Duan, Guilan 5 ; Gustave, Williamson 6 ; An, Xia 1 ; Tang, Xianjin 2 ;
作者机构： 1.Zhejiang Acad Agr Sci, Zhejiang Inst Landscape Plants & Flowers, Hangzhou 311251, Peoples R China
2.Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecosyst Hlth, Hangzhou 310058, Peoples R China
3.Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Coll Environm & Resource Sci, Hangzhou 310058, Peoples R China
4.CSCEC 8th Div Environm Technol Co Ltd, Shanghai 200131, Peoples R China
5.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
6.Univ Bahamas, Sch Chem & Environm Life Sci, New Providence, Nassau, Bahamas
关键词： Arsenic (As); Citric acid; Paddy soil; Speciation transformation; Microbial community; Functional gene
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： 2024 年 249 卷
页码：
收录情况： SCI
摘要： Root exudate is a major source of soil organic matter and can significantly affect arsenic (As) migration and transformation in paddy soils. Citric acid is the main component of rice root exudate, however, the impacts and rules of citric acid on As bioavailability and rhizobacteria in different soils remains unclear. This study investigated the effects of citric acid on As transformation and microbial community in ten different paddy soils by flooded soil culture experiments. The results showed that citric acid addition increased total As and arsenate (As (V)) in the soil porewater by up to 41-fold and 65-fold, respectively, after 2-h incubation. As(V) was the main As species in soil porewater within 10 days with the addition of citric acid. Non-specifically sorbed As of soils, total Fe and total As were the main environmental factors affecting the soil microbial communities. High-throughput sequencing analysis demonstrated that citric acid addition significantly altered the soil microbial community structure, shifting the Proteobacteria-related reducing bacteria to Firmicutes-related reducing bacteria in different paddy soils. The relative abundance of Firmicutes was promoted by 174-196%. Clostridium-related bacteria belonging to Firmicutes became the dominant genera, which is believed to regulate As release through the reductive dissolution of iron oxides or the direct reduction of As(V) to arsenite (As(III)). However, citric acid addition significantly decreased the relative abundance of Geobacter and Anaeromyxobacter, which are also typical active As(V)- and ferric-reducing bacteria. Real-time quantitative polymerase chain reaction (qPCR) also revealed that the addition of citric acid significantly decreased the relative abundances of Geobacter in the different soils by 8-28 times while the relative abundances of Clostridium increased by 2-5 times. These results provide significant insight on As transformation in different types of rice rhizospheric soils and guidance for the application of rice varieties with low citric acid exuding to restrict As accumulation.
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