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15 - Appendix: Towards a standardized protocol for the measurement of soil CO2 efflux

Published online by Cambridge University Press:  11 May 2010

Werner L. Kutsch
Max-Planck-Institut für Biogeochemie, Jena
Michael Bahn
Leopold-Franzens-Universität Innsbruck, Austria
Andreas Heinemeyer
Stockholm Environmental Institute, University of York
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Soil CO2 efflux, more commonly termed soil respiration, is considered to be the second largest flux of carbon between terrestrial ecosystems and the atmosphere. Current estimates of global soil respiration are in the range of 68–80 Pg C a−1 (Raich and Potter, 1995; Raich et al., 2002), which exceeds estimated annual rates from fossil fuel combustion by an order of magnitude (Schlesinger and Andrews, 2000; IPCC, 2007). It must be noted that these estimates of global soil CO2 efflux are based on a very limited dataset: (1) the distribution of data for biomes is biased towards forests in the Northern hemisphere; (2) a considerable proportion of the data is based on static chamber measurements, which tend to underestimate soil respiration at high flux rates (Norman et al., 1997; Chapter 2, Pumpanen et al.); (3) annual estimates are often based on simplistic relationships (generally only temperature and sometimes also soil moisture) that capture only a limited fraction of the diurnal, seasonal, annual and inter-annual variation of soil respiration and (4) the spatial variation of soil respiration is generally not well captured, both within ecosystems and across similar ecosystems at a regional scale.

A further major problem for obtaining sensible estimates of global soil CO2 efflux is related to the fact that even though an increasing amount of data is becoming available, these more recent datasets are often not easily comparable due to different methodologies and to the limited availability of ancillary parameters.

Soil Carbon Dynamics
An Integrated Methodology
, pp. 272 - 280
Publisher: Cambridge University Press
Print publication year: 2010

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