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RRBranch DWT (nanomoles gram−1 second−1) of the species A. platanoides, C. betulus, Q. robur, and T. cordata taking biomass frequencies of root order classes 1 + 2 white, 1 + 2 brown, and ≥3 and their respiration rates (RRDWT) into account. Different capital letters indicate significant difference between species (mean + se; Tukey-Kramer test, P < 0.05; n = 5). d.wt., Dry weight.
