| PSB (Photosynthetic Bacteria), which emerged 2 billion years ago, is the general term for all kinds of bacteria that use light to photosynthesis without oxygen emission, with high value in basic theoretical research and application. In theory, it is the best experimental material for studying photosynthesis, nitrogen fixation, and exploring the origin of life, biological evolution. In application, it can be used for producing hydrogen, biodegradable plastics, biological insecticide and bio-fertilizer. It is also used for purificating organic pollution, treating high concentrate organic waste water, and biological denitrogenation.XingYun Lake is a typical plateau lake, but there is no one who begins to study the distribution of microbial population in the lake , the number variance in time and space, and the relationship between the distribution and eutrophication of lake. In this dissertation, the studying object is the PSB , which one of the important populations in ecosystem in XingYun lake. We hope to find out the vertical and horizontal distribution of PSB in XingYun lake. Simultaneously, we want to screen the strain with excellent function and high activity so that could lay a foundation for further exploring natural resource of microbion in plateau lakes.This dissertation consisted of 3 parts:1. Comprehensive analysis of environmental factors of XingYun lake;2. Numerical distribution and population structure of PNSB of the XingYun lake;3. Application of PNSB of XingYun lake in wastewater treatment, decoloration of reactive Red X-3B.The detailed results and conclusions were as follows:1. Environmental factors (SD, TN, TP, BOD, COD and Chl-a) were remarkably different according to the difference of horizontal locations and sampling periods in XingYun Lake ,... |
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