期刊
FRONTIERS IN MICROBIOLOGY
卷 11, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2020.01772
关键词
microbial community; salinization; desalinization; lake sediments; salinity
类别
资金
- National Natural Science Foundation of China [91751206, 41521001, 41672337, 41602346]
- 111 Program (State Administration of Foreign Experts Affairs) [B18049]
- Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [2019QZKK0805]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)
- State Key Laboratory of Biogeology and Environmental Geology, CUG [GBL11805]
- 111 Program (Ministry of Education of China) [B18049]
Uncovering microbial response to salinization or desalinization is of great importance to understanding of the influence of global climate change on lacustrine microbial ecology. In this study, to simulate salinization and desalinization, sediments from Erhai Lake (salinity 0.3-0.8 g/L) and Chaka Lake (salinity 299.3-350.7 g/L) on the Qinghai-Tibetan Plateau were transplanted into different lakes with a range of salinity of 0.3-299.3 g/L, followed byin situincubation for 50 days and subsequent geochemical and microbial analyses. Desalinization was faster than salinization in the transplanted sediments. The salinity of the transplanted sediment increased and decreased in the salinization and desalinization simulation experiments, respectively. The TOC contents of the transplanted sediments were lower than that of their undisturbed counterparts in the salinization experiments, whereas they had a strong negative linear relationship with salinity in the desalinization experiments. Microbial diversity decreased in response to salinization and desalinization, and microbial community dissimilarity significantly (P< 0.01) increased with salinity differences between the transplanted sediments and their undisturbed counterparts. Microbial groups belonging toGammaproteobacteriaandActinobacteriabecame abundant in salinization whereasBacteroidetesandChloroflexibecame dominant in desalinization. Among the predicted microbial functions, hydrogenotrophic methanogenesis, methanogenesis through CO(2)reduction with H-2, nitrate/nitrogen respiration, and nitrification increased in salinization; in desalinization, enhancement was observed for respiration of sulfur compounds, sulfate respiration, sulfur respiration, thiosulfate respiration, hydrocarbon degradation, chemoheterotrophy, and fermentation, whereas depressing was found for aerobic ammonia oxidation, nitrate/nitrogen respiration, nitrification, nitrite respiration, manganese oxidation, aerobic chemoheterotrophy, and phototrophy. Such microbial variations could be explained by changes of transplantation, salinity, and covarying variables. In summary, salinization and desalinization had profound influence on the geochemistry, microbial community, and function in lakes.
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