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Relationship between root tensile strength (Tr) and root diameter (d) for the analysed plant species according to life form: (A) for graminoids and (B) for forbs and shrubs. For species with a significant strength–diameter relationship, the power law eqn (1) is given. In (C) the related regression lines for species with a significant strength–diameter relationship are given. Note the different scales of the y- and x-axes in (A) and (B).
