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Temporal and Spatial Variations of Microbial Carbon Utilization in Water Bodies from the DajiuhuPeatland, Central China

Ruicheng Wang1, Hongmei Wang*1, Xing Xiang1, Yu Gao1, Qingwei Song1, Linfeng Gong2
1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geoscience, Wuhan 430074, China;2. State Key Laboratory Breeding Base of Marine Genetic Resources, Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Key Laboratory of Marine Genetic Resources of Fujian Province, Xiamen 361005, China

ABSTRACT: To investigate the microbial utilization of organic carbon in peatland ecosystem, water samples were collected from the DajiuhuPeatlandand nearby lakes, central China across the year of 2014. The acridine orange (AO) staining and Biolog Eco microplates were used to numerate microbial counts and determine the carbon utilization of microbial communities. Meanwhile, physicochemical characteristics were measured for subsequent analysis of the correlation between microbial carbon utilization and environmental factors. Results indicated that total microbial countswere between 106~107 cell/L. Microbial diversities and carbon utilizationrates showed a similar pattern, highest in September and lowest in November. Microbial communities in the peat pore waters preferredto utilize N-bearing carbon sources such as amines and amino acids compared with microbial communities in lakes.The network analysis of microbial utilization of 31 carbon substrates clearly distinguished microbial communities from peat pore waters and those from lakes. Redundancy analysis (RDA) showedthe total organic nitrogen content (P=0.03, F=2.5) and daily average temperature (P=0.034, F=2.4) significantly controlled microbial carbon utilization throughout the sampling period. Our report is the first one to address thetemporal and spatial variations of carbon utilization of microbial communities which are closely related to the decomposition of organic matter in the DajiuhuPeatland in context of climate warming.

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Keywords:carbon source, microbial carbon utilization, average temperature, the DajiuhuPeatland

DOI:
10.1007/s12583-017-0818-5
CLC number:
U469.72
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