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首页> 外文期刊>Oceanologia >Seasonal patterns and environmental drivers of nirS- and nirK-encoding denitrifiers in sediments of Daya Bay, China
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Seasonal patterns and environmental drivers of nirS- and nirK-encoding denitrifiers in sediments of Daya Bay, China

机译：大亚湾沉积物中nirS和nirK编码反硝化剂的季节模式和环境驱动因素

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Summary The seasonal patterns of the denitrifiers (denitrifying bacteria) in the sediment of Daya Bay, southern China, were examined using quantitative PCR and high-throughput MiSeq sequencing methods in spring, summer and winter. The abundance and diversity of nir S-encoding denitrifiers were much higher than that of nir K-encoding denitrifiers, indicating that the former probably dominated the denitrification processes in sediments of Daya Bay. The average abundance and diversity of nir S-encoding denitrifiers were much higher in spring than that in summer and winter, on the other hand, the abundance of nir K-encoding denitrifiers showed the opposite pattern. The species composition of nir S-encoding denitrifiers community in spring differed significantly from that in summer and winter, whereas, no significant difference existed between summer and winter. The dominant environmental drivers for the diversity of community species were NOsub2/subsup?/sup, NOsub3/subsup?/sup and DO concentrations. The abundances of dominant genera of nir S- encoding denitrifiers, Accumulibacter sp. and Cuprizvidus sp., were significantly higher in summer and winter than that in spring, and were negatively correlated with NOsub2/subsup?/sup, NOsub3/subsup?/sup, and DO concentrations ( p ??0.05). In contrast, the abundances of Azoarcus sp. and Halomonas sp., were highest in spring, and were positively correlated with NOsub3/subsup?/sup and NOsub2/subsup?/sup content ( p ??0.05). For nir K-encoding denitrifiers, a significant difference in community composition was observed between spring and winter. No obvious correlation was found between community composition of nir K-encoding denitrifiers and environmental parameters.
机译：总结在春季，夏季和冬季，使用定量PCR和高通量MiSeq测序方法对中国南方大亚湾沉积物中反硝化剂（反硝化细菌）的季节性模式进行了研究。编码Nir S的反硝化剂的丰度和多样性远高于编码Nir K的反硝化剂，表明前者可能主导了大亚湾沉积物中的反硝化过程。春季，Nir S编码反硝化剂的平均丰度和多样性比夏季和冬季高得多，另一方面，nir K编码反硝化剂的丰度却呈现相反的趋势。春季Nir S编码反硝化菌群落的物种组成与夏季和冬季明显不同，而夏季和冬季之间没有显着差异。导致群落物种多样性的主要环境驱动因素是NO 2 ？，NO 3 ？和DO浓度。编码Nir S的反硝化菌Accumulibacter sp。的优势属丰富。和Cuprizvidus sp。，夏季和冬季明显高于春季，并且与NO 2 ？，NO 3 <负相关。 sup>？和DO浓度（p？<？0.05）。相反，Azoarcus sp。的丰度。和Halomonas sp。，在春季最高，并且与NO 3 ？和NO 2 ？正相关。含量（p≤0.05）。对于Nir编码反硝化剂，春季和冬季之间观察到群落组成的显着差异。在Nir编码反硝化剂的群落组成与环境参数之间没有发现明显的相关性。

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