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. 2019 Jul 23;124(6):1121–1131. doi: 10.1093/aob/mcz128

Fig. 3.

Fig. 3.

The Relative Interaction Index (RII) for leaf N, P and Mn concentrations in N. betuloides (Nb), N. pumilio (Np), E. coccineum (Ec) and G. avellana (Ga) seedlings experimentally grown in a nursery (red solid line) and in a tephra substrate (turquoise broken line) and with different neighbours: conspecific pair (e.g. Ec_Ec or Nd_Nd); heterospecific pair of the same family (e.g. Ec_Ga or Nd_Np); or heterospecific pair of contrasting families (e.g. Ec_Np, Ga_Np). The RII can have values from –1 to 1, negative values indicating a decrease (blue sky zone) and positive values an increase (white zone) in the variable value when growing with neighbours. For details of the computation of RII see the Materials and Methods section. Insets show leaf nutrient concentrations of seedlings growing alone (e.g. Nb_1) or with a neighbour in the two type of substrate described above.