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Flux and turnover of fixed carbon in soil microbial biomass of limed and unlimed plots of an upland grassland ecosystem

Rangel-Castro, J Ignacio; Prosser, Jim I.; Ostle, Nick; Scrimgeour, Charlie M.; Kilham, Ken; Meharg, Andy A.. 2005 Flux and turnover of fixed carbon in soil microbial biomass of limed and unlimed plots of an upland grassland ecosystem. Environmental Microbiology, 7 (4). 544-552. 10.1111/j.1462-2920.2005.00722.x

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Abstract/Summary

The influence of liming on rhizosphere microbial biomass C and incorporation of root exudates was studied in the field by in situ pulse labelling of temperate grassland vegetation with 13CO2 for a 3-day period. In plots that had been limed (CaCO3 amended) annually for 3 years, incorporation into shoots and roots was, respectively, greater and lower than in unlimed plots. Analysis of chloroform-labile C demonstrated lower levels of 13C incorporation into microbial biomass in limed soils compared to unlimed soils. The turnover of the recently assimilated 13C compounds was faster in microbial biomass from limed than that from unlimed soils, suggesting that liming increases incorporation by microbial communities of root exudates. An exponential decay model of 13C in total microbial biomass in limed soils indicated that the half-life of the tracer within this carbon pool was 4.7 days. Results are presented and discussed in relation to the absolute values of 13C fixed and allocated within the plant–soil system

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1462-2920.2005.00722.x
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.2 Carbon
CEH Sections: _ Ecological Processes in Freshwater & Soils
ISSN: 1462-2912
NORA Subject Terms: Agriculture and Soil Science
Biology and Microbiology
Ecology and Environment
Earth Sciences
Date made live: 05 Apr 2012 11:17
URI: http://nora.nerc.ac.uk/id/eprint/5088

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