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Relation between Bacteria in Glacial Snow with Climate and Environment in the Tibetan Plateau

ZHANG Shu-hong,HOU Shu-gui,QIN Xiang,WANG Ye-tang,DU Wen-taoKey Laboratory of Cryosphere and Environment,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China  
Density and species diversity of bacteria were investigated respectively by epifluorescence microscope,DGGE analysis and Shannon-Weaver index,with snow pit samples from southern part of East Rongbuk(ER) Glacier,northern part of Laohugou Glacier and southeastern part of Hailuogou Glacier in the Tibetan Plateau.According to the results,bacterial density in the snow pit of Laohugou Glacier is higher than that in ER Glacier and Hailuogou Glacier.Species diversity of bacteria in Laohugou Glacier is higher than that in ER Glacier.Continental dust originated from the Northwest China accounts for higher density and species diversity of bacteria in the northern Tibetan Plateau,while monsoon moisture exerts great influence on bacteria with low abundance and species diversity in the southern and southeastern plateau.Hailuogou Glacier is the highest in species diversity of bacteria,which is consistent to their most kind of derivation from atmospheric circulations.Bacterial density in ER Glacier is very close to that in south pole of Antarctica,which confirmed that Himalayas provides a very low background in atmospheric environment.Density and species diversity of bacteria in ER Glacier with higher altitude are much lower than that in Laohugou Glacier and Hailuogou Glacier with lower altitude,showing their inverse proportion with the altitude.
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