Distribution and environmental significance of microbial fatty acids in borehole sediments of Chen Lake

LIU Tao; WU Pei; TANG Jin-Can; YU Hao-Ran; WANG Ya-Fen; MA Teng

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China Environmental Science ›› 2021, Vol. 41 ›› Issue (11) : 5264-5273.

Environmental Ecology

Distribution and environmental significance of microbial fatty acids in borehole sediments of Chen Lake

LIU Tao, WU Pei, TANG Jin-Can, YU Hao-Ran, WANG Ya-Fen, MA Teng

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Abstract

Microbial fatty acid methyl ester analysis was used to evaluate the vertical distribution of microbial community structure and its environmental implications in sediments from the open beach borehole G1 and the shoreline borehole G2 of Chen lake, Jianghan Plain. The results showed that total microbial fatty acids (FAs) content and their distribution characteristics fluctuated greatly in the shallow layers (<5m), and significantly differed from those in the deep layers (5~20m). Aerobes, common anaerobes and Gram-positive bacteria were the dominant microbial groups, and their relative abundance in the shallow layers was almost double that in the deep layers. The relative abundance of sulfate-reducing bacteria and other anaerobic bacteria and environmental stress index (Trans/Cis) were higher in G1 than those in G2. The environmental factors related to dissolved oxygen, such as particle size and depth, were the key factors affecting the composition of microbial community. Owing to the stronger hydrodynamic conditions at G2, the total FAs and the relative dominance of aerobic microorganisms were higher than those at G1. Total nitrogen and N/P were relatively low in deep sediments, where microbial community structure was mainly affected by the carbon and nitrogen source availability, especially the nitrogen content. These findings provide new insights on the effects of anthropogenic nitrogen and phosphorus pollution on microbial community in the deep lake sediments.

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lake hyporheic zones / microbial community structure / microbial fatty acids / sediment

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LIU Tao, WU Pei, TANG Jin-Can, YU Hao-Ran, WANG Ya-Fen, MA Teng. Distribution and environmental significance of microbial fatty acids in borehole sediments of Chen Lake[J]. China Environmental Science. 2021, 41(11): 5264-5273

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