Fig. 2
From: Estimating the productive potential of five natural forest types in northeastern China
Frequency distributions of the main variables of the two five-year periods with fitted trend lines: N indicates the number of trees per hectare; Age and Hdom are the average age and height of dominant trees, respectively; V1 and V2 denote the stand volumes of the initial and final phases of the two five-year periods, respectively; G1 and G2 are the basal areas of the initial and final phases of the two five-year periods, respectively; and GST and GSP are the mean growth season temperatures and precipitation of the two five-year periods, respectively