Figure S1. Chlorophyll fluorescence parameters along a vertical light availability gradient in natural herbaceous and woody canopies.

Figure S2. Path diagrams to assess the effect of leaf growth irradiance on leaf nitrogen content per area (Narea), chlorophyll content and photochemical quenching (qP).

Table S1. The main effects and interactions of relative irradiance (Idif), leaf nitrogen content per unit area (Narea) and species (independent variables) on chlorophyll fluorescence parameters (dependent variables).

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