This paper studied petrochemical characteristics and REE characteristics in carbonaceous shale in Kaiyang and Zhijin of Guizhou.The content of K2O is greater than Na2O,which is the same to that in south of China.The geochemical characteristics of REE in black shale show that the total content of REE in black shale in Niutitang group of Kaiyang and Zhijin of Guizhou is 227.47×10-6～623.18×10-6,average 532.69×10-6,and the total content of LREE is much higher.The range of content of Y is from 122.02×10-6 to 188.40×10-6,average 155.26×10-6,which shows the basic characteristic of enrichment of Y.The ratio of LREE to HREE is 1.35～1.67,which shows that LREE and HREE are relatively intensive.That is similar to the composition of REE in phosphorite of Zhijin,which indicates a certain relationship of origination.The composition mode of REE and distribution mode of REE show that this mode of distribution of REE is typical marine deposit and belongs to genesis of marine deposit.
Denitrifying anaerobic methane oxidation (DAMO) is a vital methane sink in wetlands. However, the interactions and niche partitioning of DAMO bacteria and archaea in freshwater wetland soils, in addition to the interactions among microorganisms that couple methane and nitrogen cycling is still unclear, despite that these factors may govern the fate of methane and nitrogen in wetlands. Here, we evaluated the vertical distribution of DAMO bacteria and archaea in soil layers along with the potential interactions among populations in the methane-coupled nitrogen cycling microbial community of Tibetan freshwater wetlands. A combination of molecular biology, stable isotope tracer technology, and microbial bioinformatics was used to evaluate these interrelated dynamics. The abundances and potential methane oxidation rates indicated that DAMO bacteria and archaea differentially occupy surface and subsurface soil layers, respectively. The inferred interactions between DAMO bacteria and nitrogen cycling microorganisms within their communities are complex, DAMO bacteria apparently achieve an advantage in the highly competitive environment of surface soils layers and occupy a specific niche in those environments. Conversely, the apparent relationships between DAMO archaea and nitrogen cycling microorganisms are relatively simple, wherein high levels of cooperation are inferred between DAMO archaea and nitrate-producing organisms in subsurface soils layers. These results suggest that the vertical distribution patterns of DAMO bacteria and archaea enable them to play significant roles in the methane oxidation activity of different soil layers and collectively form an effective methane filtration consortium.
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