3.4 Correlation analysis among characteristic indexes
The correlation analysis of eight height indicators, LWC, AGB, BGB, and
four photosynthetic characteristic indexes showed that there was a
significant positive correlation between height and AGB, with a
correlation coefficient of 0.383 (P <0.01), and a
negative but not significant correlation with BGB. LWC was negatively
correlated with AGB and Ci, with correlation coefficients of -0.472 and
-0.280, respectively (P <0.01), and had a significantly
positive correlation with Pn (P <0.05). Pn had a
significantly positive correlation with Tr and Gs, with correlation
coefficients of 0.384 and 0.373, respectively (P <0.01).
Tr had a significantly positive correlation with Gs and Ci
(P <0.01), with correlation coefficients of 0.426 and
0.349, respectively. Finally, Gs and Ci had a significantly positive
correlation, with a correlation coefficient of 0.380
(P <0.01) (Table 3).