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RRDWT (nanomoles gram−1 second−1) of the species A. platanoides, C. betulus, Q. robur, and T. cordata in relation to root diameter. Gauss curves were fitted per species and all data points (line not drawn). The R2 results (P < 0.001) indicate that between 56% and 79% of the between root segments variance in respiration is accounted for by the diameter (per species, n = 33–45; all species, n = 164). d.wt., Dry weight.
