Bacteria diversity, distribution and insight into their role in S and Fe biogeochemical cycling during black shale weathering.

摘要: A group of black shale samples, which were collected sequentially along a continuous depositional unit from bottom fresh zone toward the surface regolith weathering profile at Chengkou County, Southwest China, examined using mineralogical, geochemical and pyrosequencing techniques. The mineralogical analyses indicated that provided series extremely acidic chemical species changed microbial habitats following process weathering. This finding is in contrast with previous hypothesis low-diversity bacterial community existed these harsh environments; showed diverse communities 33 different phyla/groups samples. Among phyla/groups, proteobacteria, actinobacteria firmcutes more dominant than other phyla, phylogenetic structures vary progressive Moreover, canonical-correlation analysis suggested pH sulfur sulfate, followed by total Fe pyrite, are significant factors shape structure. In addition, large proportion S- Fe-related bacteria, such as Acidithiobacillus, Sulfobacillus, Thiobacillus, Ferrimicrobium Ferrithrix, may be responsible for pyrite bio-oxidation, well S biogeochemical cycling, environments.