Table 3.

Variables used to characterize the neighborhood of the target trees.

Variable name	Reference	Definition	Variable type (with unit)
Competition	Eq. (1)	Quantifies the total amount of competition around a target tree independently of the species.	Continuous (unitless)
Percentage of intraspecific competition	Eq. (2)	Portion of competition coming from intraspecific trees around the target tree. It is a percentage, thus the value does not reflect the absolute quantity of competition.	Continuous (%)
Mixed/pure	Based on the percentage of intraspecific competition	It is based on the percentage of intraspecific competition: mixed ≤ 50%; pure > 50%.	Categorical
Species diversity	Eq. (3)	It reflects the diversity of species around a target tree, including species richness and evenness.	Continuous (unitless)