Summary of the statistics of N and P concentrations and N: P ratios in leaves of different functional groups of terrestrial plants.

Multiple comparisons were made for each group of trees and shrubs, evergreen and deciduous, coniferous and broad-leaved. Mean represents the geometric mean, and n represents the number of observations. Different letters (such as a and b) represent significant differences (p < 0.05).针对乔灌类群、常绿与落叶类群、针叶与阔叶类群的各组分别开展了多重比较（multiple comparisons）。均值（Mean）代表几何均值（geometric mean），n代表观测值数量。不同字母（如a与b）表示组间存在显著性差异（p < 0.05）。