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

Ke Chen, Jun Yao, Shihua Qi, Shixue Zheng, Yi Luo, G. Záray, Fei Wang, Russel Mohammad, Martin M F Choi

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)328-334
Number of pages7
JournalGeomicrobiology Journal
Volume28
Issue number4
DOIs
Publication statusPublished - May 2011

Fingerprint

freshwater sediment
Fresh Water
Thermodynamics
microbial community
Sediments
Lakes
Biomass
Carbon
sediment
thermodynamic property
China
microbial activity
Hot Temperature
Thermodynamic properties
Growth
Research
carbon
biomass
physicochemical property
method

Keywords

  • Microbiology
  • Microcalorimetry
  • Sediment profiles
  • Thermodynamics

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Microbiology
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Characterization of depth-related microbial community activities in freshwater sediment by combined method. / Chen, Ke; Yao, Jun; Qi, Shihua; Zheng, Shixue; Luo, Yi; Záray, G.; Wang, Fei; Mohammad, Russel; Choi, Martin M F.

In: Geomicrobiology Journal, Vol. 28, No. 4, 05.2011, p. 328-334.

Research output: Contribution to journalArticle

Chen, Ke ; Yao, Jun ; Qi, Shihua ; Zheng, Shixue ; Luo, Yi ; Záray, G. ; Wang, Fei ; Mohammad, Russel ; Choi, Martin M F. / Characterization of depth-related microbial community activities in freshwater sediment by combined method. In: Geomicrobiology Journal. 2011 ; Vol. 28, No. 4. pp. 328-334.
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