Is resistant soil organic matter more sensitive to temperature than the labile organic matterReport as inadecuate




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1 School of Biological Sciences

Abstract : A recent paper by Knorr et al. 2005a suggested that the decomposition of resistant soil organic matter is more temperature sensitive than labile organic matter. In Knorr et al.-s 2005a model, the reference decay rate was presumed to be same for all pools of soil carbon. We refit Knorr et al.-s 2005a model but allow both the activation energy and the reference decay rate to vary among soil C pools. Under these conditions, a similar fit to measured data can be obtained without invoking the assumption that the resistant C pool is more temperature sensitive than the labile pool. Other published evidence does not unequivocally support Knorr et al.-s 2005a hypothesis of increased temperature sensitivity of resistant pools of soil carbon. Because of the lack of experimental data, Knorr et al.-s 2005a conclusion that the decomposition of the resistant SOM is more temperature sensitive than the labile pool is premature.





Author: C. Fang - P. Smith J. U. Smith

Source: https://hal.archives-ouvertes.fr/



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