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By Werner L. Kutsch, Michael Bahn, Andreas Heinemeyer

Carbon saved in soils represents the most important terrestrial carbon pool and elements affecting it will be very important within the knowing of destiny atmospheric CO2 concentrations. This e-book offers an built-in view on measuring and modeling soil carbon dynamics. in keeping with a huge variety of in-depth contributions via prime scientists it offers an outline of present learn strategies, advancements and outlooks and introduces state-of-the-art methodologies, starting from questions of acceptable dimension layout to the aptitude software of strong isotopes and molecular instruments. It features a standardised soil CO2 efflux protocol, aimed toward info consistency and inter-site comparison and hence underpins a local and international figuring out of soil carbon dynamics. This e-book presents an enormous reference paintings for college students and scientists attracted to many elements of soil ecology and biogeochemical cycles, coverage makers, carbon investors and others eager about the worldwide carbon cycle.

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Cambridge: Blackwell Science, pp. 14–50. , Yernaux, M. and Aubinet, M. (2000) Soil CO2 efflux measurements in a mixed forest: impact of chamber disturbances, spatial variability and seasonal evolution. Global Change Biology, 6, 907–17. Lund, C. , Riley, W. , Pierce, L. L. and Field, C. B. (1999) The effects of chamber pressurization on soil-surface CO2 flux and the implications for NEE measurements under elevated CO2 . Global Change Biology, 5, 269–81. Lundeg˚ardh, H. (1922) Neue Apparate zur Analyse des Kohlens¨auregehalts der Luft.

And Ryel, R. J. (2008) Comparison of eddy covariance, chamber, and gradient methods of measuring soil CO2 efflux in an annual semi-arid grass, Bromus tectorum. Agricultural and Forest Meteorology, 148, 1894–907. Nay, M. , Mattson, K. G. and Bormann, B. T. (1994) Biases of chamber methods for measuring soil CO2 efflux demonstrated with a laboratory apparatus. Ecology, 75, 2460–3. , Perrin, D. et al. (2006) Cross-calibration functions for soil CO2 efflux measurement systems. Annals of Forest Science, 63, 477–84.

Therefore, the open chamber system has to be designed very carefully to avoid artificial underpressure or overpressure during the measurements. Pump(s) can also induce PDC in open chamber systems (Rayment and Jarvis, 1997; Fang and Moncrieff, 1998) if the inlet and outlet airflow are not the same. Flow rate differences can be induced by the resistance at the inlet or outlet of the chamber. It may not be enough just to let the air be drawn into or out of the chamber. Even if the inlet and the outlet are large in diameter, there is always a small PDC as long as the air is only sucked into or out of the chamber.

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