Dataset.xlsx: Main dataset used in our study. R-code-foliar δ15N v2.R:All R code used in analysising our data map (dir): the source file (.shp) of our studied region, which was used to produce Figure 2, and Figure S1. phylo.tree.tre: The ultrametric phylogenetic tree used to calculated phtlogenetic signals in our study. DA_IR.xlsx: The incremental R2 calculated by dominance analysis IR_calculated_N.xlsx and IR_calculated_N15.xlsx: All possible sub-models used to calcluated the incremental R2 for foliar N and δ15N