http://dx.doi.org/10.1080/01490451.2010.501647">
 

Document Type

Journal Article

Authors

Ke Chen, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, School of Environmental Studies, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Jun Yao, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, School of Environmental Studies, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Shihua Qi, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, School of Environmental Studies, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Shixue Zheng, State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University
Yi Luo, Yale School of Forestry and Environmental Studies
Gyula Záray, Department of Chemical Technology and Environmental Chemistry, Eötvös University
Fei Wang, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, School of Environmental Studies, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Russel Mohammad, Key Laboratory of Biogeology and Environmental Geology of Chinese Ministry of Education, School of Environmental Studies, Sino-Hungarian Joint Laboratory of Environmental Science and Health, China University of Geosciences
Martin M. F. Choi, Department of Chemistry, Hong Kong Baptist UniversityFollow

Department/Unit

Department of Chemistry

Title

Characterization of depth-related microbial community activities in freshwater sediment by combined method

Language

English

Abstract

Currently there are very few researches on studying the vertical changes of metabolic and thermodynamic properties of microbial communities in freshwater lake sediment. In this work, a multi-channel microcalorimetric system was applied to investigate both the metabolism and thermodynamic properties of 0-35 cm sediment cores from Lake Honghu (Jingzhou, Hubei Province, China). It is suggested that the catastrophic flood in 1998 had changed the structure of the 20-25 cm sediment layer. In this layer, both the physicochemical properties of sediment and the thermodynamic activities of microorganisms exhibit distinct differences from other layers. It displays the highest TOC, TN and C/N values. The power-time curves of microcalorimetric measurement on the sediment samples were plotted to illustrate their microbial activities. The 20-25 cm sediment layer showed the lowest microbial activities with a maximum heat flow rate of 56.97 μW, a growth rate constant of 0.06 h-1 and the time to reach the peak was 98 h. A positive correlation (r = 0.972, P < 0.001) was found between the cell specific metabolic enthalpy change rate (ΔH0) and the TOC of the sediment samples. ΔH0 could indicate the utilization efficiency of carbon source which is not affected by the biomass but relies on the intrinsic properties of sediment. Our work shows that the higher the TOCin sediment; the lower the efficiency in assimilating carbon into biomass by the microbes.

Keywords

Microbiology, Microcalorimetry, Sediment profiles, Thermodynamics

Publication Date

2011

Source Publication Title

Geomicrobiology Journal

Volume

28

Issue

4

Start Page

328

End Page

334

Publisher

Taylor & Francis

ISSN (print)

01490451

ISSN (electronic)

15210529

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