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Alleviation of Cd-polluted paddy soils through Si fertilizer application and its effects on the soil microbial community

文献类型： 外文期刊

作者： Peng, Hua 1 ; Deng, Kai 1 ; Shi, Yu 5 ; Liu, Saihua 1 ; Jian, Zhu 1 ; Li, Changjun 1 ; Ji, Xionghui 1 ; Li, Shengnan 1 ;

作者机构： 1.Hunan Acad Agr Sci, Hunan Inst AgroEnvironm & Ecol, 560 Second Yuanda Rd, Changsha 410125, Peoples R China

2.Hunan Normal Univ, Coll Life Sci, State Key Lab Dev Biol Freshwater Fish, 36 Lushan Rd, Changsha 410081, Peoples R China

3.Minist Agr, Key Lab Agr Environm Middle Reach Plain Yangtze R, Changsha 410125, Peoples R China

4.Key Lab Prevent Control & Remediat Soil Heavy Met, Changsha 410125, Peoples R China

5.Xiangxi Stn Soil & Fertilizer, Jishou 416000, Peoples R China

关键词： Cadmium alleviation; Rice; Field experiment; Microbial structure; Microbial functional properties

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2023 年 855 卷

页码：

收录情况： SCI

摘要： In this study, the effects of slag-based Si fertilizers on Cd-polluted paddy soils, soil microbial diversity, and functional properties were evaluated through a long-term field experiment conducted in a double-rice cropping system in southern China. The results showed that soil pH significantly increased from 5.15 to 6.13 after seven years of Si fertilization. Cd accumulation in both the soil and rice plants were significantly decreased for all the Si fertilizers treatments. Treatments using Si fertilizer in powder form exhibited the best alleviation effects, where soil available Cd decreased from 0.50 mg kg(-1) to 0.43 mg kg(-1), and Cd accumulation in rice roots, straw, and grains decreased by 32.2%, 57.2%, and 45.5%, respectively, than that in the control. Following Si application, the soil microbial richness and Shannon diversity increased from 6731 to 7549 and 7.12 to 7.28, respectively. Proteobacteria, Nitrospirae, and Gemmatimonadetes, were significantly enriched in the Si-treated samples, whereas Verrucomicrobia, Chlamydiia, Ktedonobacteria and Candidatus_Saccharibacteria exhibited opposite patterns. Bioinformatics analysis using phylogenetic investigation of communities by reconstruction of unobserved states tools revealed that the varied microbial community induced functional adaption of soil microorganisms involved in metabolism, genetic information processing, cellular processes, and environmental information processing. The soil pH, NH4-N, and available Cd and Si contents were the key factors that best explained the variations in bacterial community composition among different treatments. Slag-based Si fertilizers are effective for Cd detoxication and can benefit the growth of rice plants throng the regulation of soil microorganisms.

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