Figure 2From: Phenotypic plasticity of fine root growth increases plant productivity in pine seedlingsPath diagrams representing the cause-and-effect relationship between the two predictor variables, foliage biomass and fine-root biomass proportions, and the response variable, stem biomass, that results from differences in nutrient supply. The variable residual is the undetermined portion. p and r denote path coefficients and correlation coefficients, respectively.Back to article page