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C. H. Robinson, P. A. Wookey, A. N. Parsons, J. A. Potter, T. V. Callaghan, J. A. Lee, M. C. Press, J. M. Welker, Responses of Plant Litter Decomposition and Nitrogen Mineralisation to Simulated Environmental Change in a High Arctic Polar Semi-Desert and a Subarctic Dwarf Shrub Heath, Oikos, Vol. 74, No. 3 (Dec., 1995), pp. 503-512
Robinson et al. (Fri,) studied this question.