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Structure and distribution of nitrite-dependent anaerobic methane oxidation bacteria vary with water tables in Zoige peatlands

生物 泥炭 无氧运动 甲烷厌氧氧化 甲烷 亚硝酸盐 生态学 细菌 产甲烷菌 厌氧菌 环境化学 硝酸盐 生理学 古生物学 化学
作者
Qiuping Zhong,Dan Xue,Huai Chen,Liangfeng Liu,Yixin He,Dan Zhu,Zhili He
出处
期刊:FEMS Microbiology Ecology [Oxford University Press]
卷期号:96 (5) 被引量:18
标识
DOI:10.1093/femsec/fiaa039
摘要

The recently discovered nitrite-dependent anaerobic methane oxidation (n-damo) is an important methane sink in natural ecosystems performed by NC10 phylum bacteria. However, the effect of water table (WT) gradient due to global change on n-damo bacterial communities is not well studied in peatlands. Here, we analysed the vertical distribution (0-100 cm) of n-damo bacterial communities at three sites with different WTs of the Zoige peatlands in the Qinghai-Tibetan Plateau. Using an n-damo bacterial specific 16S rRNA gene clone library, we obtained 25 operational taxonomic units (OTUs) that could be divided into Groups A, B, C, D and E (dominated by A and B). The dominant group was Group B at the high (OTU14 and OTU20) and intermediate (OTU7 and OTU8) WT sites and Group A was dominant at the low WT site (OTU6 and OTU5). Using high-throughput sequencing, we observed that n-damo bacteria mainly distributed in subsurface soils (50-60 and 20-30 cm), and their relative abundances were higher at the low WT site than at the other two sites. In addition, we found that pH and nitrate were positively correlated with Group A, while total organic carbon, total nitrogen and ammonia were positively associated with Group B. Our study provides new insights into our understanding of the response of n-damo bacteria to WT gradient in peatlands, with important implications for global change.
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