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首页> 外文期刊>International Biodeterioration & Biodegradation >Comparison of microbial communities inside and outside of a denitrification hotspot in confined groundwater
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Comparison of microbial communities inside and outside of a denitrification hotspot in confined groundwater

机译：受限地下水中反硝化热点内外的微生物群落比较

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A denitrification hotspot was detected in Kumamoto groundwater in a previous study, little information is concerned with the microbial community profile including denitrifier. Seven samples from inside and outside of the hotspot were collected to analyze the bacterial, archaeal, and denitrifier community using a cloning library approach. The results showed that the microbial diversity and distribution were distinct among the zones. Major operational taxonomic units closely related to Proteobacteria, Firmicutes, and Actinobacteria were found in the denitrification hotspot. Additionally, type I methylotrophic bacteria, such as Methylobacter and Methylomonas, only inhabited the hotspot zone. A positive association between methanogenic archaea and methylotrophic bacteria was observed. Interestingly, acidic ammonia oxidizing archaea were detected in the neutral groundwater environment. In addition, gene-specific analysis targeting nirS indicated that the majority of denitrifiers belonged to the Proteobacteria including Sulfuritalea hydrogenivorans, Pseudomonas balearica and Sulfuricella denitrificans. Based on the comparative analysis of microbial communities and physiochemical parameters inside and outside of the denitrification hotspot, the anaerobic environment with organic compounds and nitrate could support the biotic reduction of nitrate in confined groundwater. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在先前的研究中，在熊本州的地下水中发现了一个反硝化的热点，很少有人关注包括反硝化剂在内的微生物群落概况。使用克隆文库方法收集了热点内部和外部的七个样本，以分析细菌，古细菌和反硝化菌群落。结果表明，各区域之间的微生物多样性和分布是不同的。在反硝化热点中发现了与变形杆菌，硬毛菌和放线菌密切相关的主要操作分类单位。此外，I型甲基营养型细菌（例如甲基细菌和甲基单孢菌）仅栖息在热点区域。产甲烷古菌与甲基营养菌之间存在正相关。有趣的是，在中性地下水环境中检测到酸性氨氧化古细菌。此外，针对nirS的基因特异性分析表明，大多数反硝化剂都属于变形杆菌，包括嗜氢硫霉菌，巴氏假单胞菌和反硝化硫菌。通过对反硝化热点内外微生物群落和理化参数的比较分析，有机化合物和硝酸盐在厌氧环境中可以支持受限地下水中硝酸盐的生物还原。 （C）2016 Elsevier Ltd.保留所有权利。

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