龙景湖沉积物的细菌群落垂向分布特征

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Abstract

This study explored the vertical distribution of bacterial communities in sediments under different deposition time and its role in the migration and transformation of substances in lake ecosystem. Stratified sediment samples were collected respectively from Original River (OR) and New-formed Bay (NB) in Longjing Lake. Redundancy analysis (RDA) were conducted based on Denaturing Gradient Gel Electrophoresis (DGGE) technology and environmental parameters. Results showed that Shannon-Wiener indexes (H) and Richness indexes (S) in OR were higher than those in NB and vertical change trend of H, S and Evenness (E) indexes decreased first and then increased as depth increased. Phylogenetic analysis revealed that Longjing lake mainly included seven phyla of bacteria. Deltaproteobacteria, Bacteroidetes and Chloroflexi dominated in surface layers whereas Chloroflexi dominated in middle layers of OR sediments. Deltaproteobacteria and Chloroflexi were the main phyla in deep layers of both sites. Other phyla included Ignavibacteriae, Actinobacteria, Firmicutes and Chlorobi. RDA showed that the main factors influencing bacterial community composition and distribution were total nitrogen (TN), total sulphur (TS) and the concentrations of total organic carbon (TOC) in pore water, as well as average particle size in sediments. Otherwise, the obtained bacteria were closely related to the degradation of organic matter (OM). That TOC and TN contents in OR were higher than those in NB caused relatively higher bacteria species and abundance of Deltaproteobacteria, Bacteroidetes, and Ignavibacteriae.

Key words： bacterial community vertical distribution DGGE RDA

Received: 23 September 2016

PACS:

X171.5

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	Articles by authors
	NIU Feng-xia
	JI Fang-ying
	ZHAO Gen
	ZHANG Qian
	SHEN Qiu-shi
	HE Qiang
	YAN Hai-bo

Cite this article:

NIU Feng-xia,JI Fang-ying,ZHAO Gen等. Vertical distribution of bacterial communities in sediments of Longjing Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2322-2331.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I6/2322

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