Figure 4. Adult diameter at breast height structure and regenerated individual height structure of D. pectinatumcommunities across the three studied sites. The solid and dashed lines represent fitted power and exponential functions, respectively, and their respective R2 and P values are indicated below the site names.
The size structure of the D. pectinatum community presented an inverted J type, and the percentage (less than 20%) of seedlings/saplings was lower than that of the other growth stages across the three study areas, especially for Bawangling (16.2%) and Jianfengling (15.4%) (Figure 3). Both the power and exponential function models fit the changes in adult (P <0.05) and regenerating individual (P <0.001) mortality across the three sites well (Figure 4, Table 2). The adult and regenerating individuals had the lowest mortality rates in Diaoluoshan, followed by Jianfengling, and the highest mortality rates were observed in Bawangling.
Table 2. Power and exponential function model results for the mortality of adults and regenerating individuals across the three sites.