祁連山木里水合物鉆區(qū)古菌群落年際(2013-2014年)變化特征
[Abstract]:As a new potential alternative energy source in the 21st century, gas hydrate has attracted much attention. In the past, the international exploration of gas hydrate in permafrost region focused on the occurrence of gas hydrate in reservoir and the relationship between permafrost and gas hydrate accumulation. In recent years, with the development of research, scientists have recognized the great influence of microbial activities on hydrate distribution and permafrost environment, but the degree of research is still very weak. In this paper, using the first land gas hydrate drilling area in China, the microorganism cell abundance in soil samples was evaluated by acridine orange staining direct counting method by collecting soil samples at 7 points around the borehole. At the same time, the DNA of microorganism cells was extracted from soil samples, the 16s rRNA gene was amplified, the cloned sequences were phylogenetic and phylogenetic analysis, and the composition of the ancient bacteria communities in 2013 and 2014 were analyzed. The year-to-year variation and the differences of paleoflora under different ecological conditions were compared and analyzed in detail. It is found that the ancient bacteria in Muli area of Qilian Mountain are mainly composed of Quangu and Guangu. Among them, Quanggu contains Group 1.1b, Groupl.3 and a small amount of (Thermoproteales). The palaeomycetes contained (Methanomicrobia), (Thermoplasmata) and a small number of methanobacterium (Methanobacteria). 1. 3 were the dominant groups of the whole community, and (Methanomicrobia) was the dominant group in the whole community. On the whole, the diversity of palaeomycetes community in the surface layer was higher than that in the subsurface layer. The surface layer generally contained more Group 1.1b group, and the subsurface layer generally contained more Group1.3 group .1b, (Thermoproteales) and moisture content. There was a significant negative correlation between electrical conductivity and methane content in the top air, while there was a positive correlation between the methanogenic bacteria and temperature, moisture content and methane content in the top air. With the exception of individual sampling sites, the distribution characteristics of paleomycetes in most sampling sites showed great interannual variation, especially in subsurface areas. The distribution of methanogenic palaeomycetes in 2014 was significantly higher than that in 2013 (11.6%). The community structure of palaeomycetes in different ecological environments was very different. In meadow area, there were more Group 1.1b and no methanogenic bacteria, and the dominant group in swamp area was Group 1.3b. All in all, the conclusions of this study provide a certain data basis and reference for the future research on frozen soil microbes in frozen soil regions.
【學(xué)位授予單位】:中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:Q913;P618.13
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