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Soil of tropical forest ecosystem plays very crucial part in controlling the universal carbon cycle. The isolation of microorganisms and their identification are important for understanding their vital role on transformation of organic matter of this ecosystem. Soil storage maximum microbial genetic diversity because of it’s a multilayered environment. No complete methods were discovered yet to cultivate majority of soil microorganisms. A little is known about microbial structure and their essentiality in tropical peat lands compared to most other terrestrial and oceanic habitats. In providing insight to the impacts of land-use of peat land on microbes in Central Kalimantan, Borneo Indonesia, we examined the community structure and diversity of bacteria and fungi in different peat forest soil including: i) natural peat swamp forest (well mixed swamp forest type); ii) disturbed peat soil and iii) mineral soils by using 454 pyrosequencing technology. The results showed that no significant difference was found for diversity and evenness among the sites of fungal community. However, natural peat swamp forest had the highest species richness (Chao1), which was significantly higher than the other two sites (P<0.05 and P<0.05). According to the OTUs analysis four fungi phyla were obtained of which 45 species were classified. The Ascomycota was the most abundant phylum, followed by Basidiomycota, Zygomycota and Glomeromycota. The natural peat swamp forest and disturbed peat soil harbored the maximum number Ascomycota. On the other hand, mineral soil and natural peat soil contained the highest number of Basidiomycota. The top species in natural peat swamp forest included Sugiyamaella paludigena, Polyancora globosa and Ganoderma gibbosum. The mineral soil enriched the abundance of Penicillium herquei, Sugiyamaella paludigena and the disturbed peat soil contained the highest frequency of Polyancora globosa, Gymnopilus lepidotus. According to the PCoA analysis, the community structure of fungus in natural peat soil differed significantly from mineral soil (P=0.04) and disturbed peat soil (P=0.039). No significant difference was found for bacterial species richness (Chao1) among the sites. The diversity of bacteria in disturbed peat soil significantly differed from the other sites (P<0.05 and P<0.05). eleven bacterial phyla and 53 genera were examined. All of the three sites contained the similar abundance of Proteobacteria. The natural peat swamp forest and disturbed peat soil harbored the most abundant Acidobactria. Genera Mycobacterium, Gp1, Gp13, Gp2, Burkholderia, Actinospica, Aciditerrimonas were found in all the sites. Genera Granulibacter, Gp4, Acidisoma, Clostridium_sensu, Clostridium_ XI were only observed in natural peat swamp forest. Genera Rudaea, Rhodopila, Streptomycetes were found only mineral soil. The PCoA analysis showed that the structure of bacteria in natural peat swamp forest significantly differed from the disturbed peat soil (P=0.045). Overall, the bacterial species richness and diversity are more among the sites than of the fungi.

The microbial diversity and structure in peat land forest in Indonesia