Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 38, Issue 9, Pages 2958-2962Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2006.04.017
Keywords
functional microbial diversity; substrate induced respiration; community level physiological profiling; peat; whole soil FTIR
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A multiple substrate induced respiration (SIR) assay, using C-14-labelled carbon sources, was used to evaluate community level physiological profiles (CLPP) of the microbial community in peat horizons of differing degrees of humification. The separation and grouping of the peat horizons by CLPP was similar to the pattern produced by analysis of the organic carbon chemistry of the peat horizons by Fourier Transform Infrared (FTIR) spectroscopy and therefore reflected the level of decomposition. Partial redundancy analysis showed that a large proportion (68.7%) of the variability in the CLPP data could be attributed to the ratio of polysaccharide to 'carboxylate' FTIR bands alone. The multiple substrate SIR technique may, therefore, be a powerful technique to further elucidate the influence of the microbial constituent of peat on the potential activity and patterns of cycling of labile carbon in peatlands. (c) 2006 Elsevier Ltd. All rights reserved.
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