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- Title
镉污染对山区水库消落带湿地土壤细菌群落结构及多样性的影响.
- Authors
陈海生; 姜伟; 徐蒋来; 刘守平; 罗文; 高永胜; 蔡林生; 方昉; 姚金兰
- Abstract
[Objective] The present paper aimed to study the effects of cadmium pollution on soil bacterial structure and diversity in riparian wetlands of mountain reservoir, and to find out the cadmium-resistant bacteria which were beneficial to the remediation of cadmium pollution. [ Method] The high throughput sequencing method of Illumina Miseq was used to analyze the effects of cadmium stress on bacterial community and diversity in rhizosphere soils of Taxodium distichum planting in riparian wetlands of Changtan reservoir, Zhejiang province. The concentrations of cadmium were set at 0, 100, 400 mg/kg, respectively, and were marked as Cd0, CdlO0, Cd400, correspondingly. [Result] The cadmium stress could cause changes in both bacterial diversity and community structure. There were 34 phyla, 96 classes, 202 orders, 313 families, and 502 genera in the rhizosphere soil of T. distichum planting in riparian wetlands of Changtan reservoir under different gradients of cadmium pollution. Low cadmium stress might raise the Chaol index and Shannon index of soil bacterial community and high cadmium stress might reduce the Chaol index and Shannon index of soil bacterial community. With the increase of Cd stress, the relative abundance of Actinobacteri and Planctomyces in the soil of riparian wetland showed a downward trend all the time, while the relative abundance of Bacteroidetes and Gemmatimonadetes were on the increase all the time. The relative abundance of soil Proteobacteria and Patescibacteria decreased first and then increased. The relative abundances of Acidobacteria, Rokubacteria, Errucomicrobia, Nitrospirae and Firrnicutes in soil increased first and then decreased. Proteobacteria, Bacteroidetes, Patescibacteria and Gemmatimonadetes were the dominant groups in high Cd concentration stress. With the increase of Cd stress, the relative abundance of Pseudarthrobacter, Muciaginibacter and Rhodopseudomonas in the soil of riparian wetland showed a downward trend all the time, while the relative abundance of Flavobacterium was on the increase all the time. The relative abundance of soil Rhodanobacter decreased first and then increased. The relative abundances of Sphingomonas in soil increased first and then decreased. This indicated that low cadmium stress might stimulate the growth and eproduction of cadmium-sensitive bacteria, which made the community structure more complex. High concentration of cadmium significantly inhibited bacteria, resulting in the extinction of some species and the decrease of diversity. High cadmium pollution could induce cadmium-resistant bacteria such as Rhodanobacter to become dominant groups, and the community structure tended to be stable and single. The bacterial community structure had obvious response characteristics to different cadmium pollution stresses and could be used as a sensitive index for soil quality evaluation of cadmium contaminated wetlands. [ Conclusion]There are a large number of Rhodanobacter,Gemmatimonadaceae-unclassified,Massilia,Candidate-Adlerbacteria-unclassified, Chitinophagaceae-unclassified, Alphaproteobacteria-unclassified, Flavobacterium and Duganella in the Cd400 group, which can be used as a reference for microbial remediation of cadmium contaminated riparian wetland of montain reservoir in southern China.
- Subjects
NUCLEOTIDE sequencing; BACTERIAL communities; CADMIUM; WETLANDS
- Publication
Southwest China Journal of Agricultural Sciences, 2023, Vol 36, Issue 10, p2273
- ISSN
1001-4829
- Publication type
Article
- DOI
10.16213/j.cnki.scjas.2023.10.024