Abstract:

With the research object of single tree of Cunninghamia lanceolata plantation in Hunan Province,the variation characteristics and influencing factors of that were studied by using the coefficient of variation method,one-way analysis of variance,pearson correlation analysis and multiple linear regression analysis.Research indicates:1) Through the variation coefficient method,the coefficient of variation of the experimental form factor of the single tree in Cunninghamia lanceolata plantation (0.112 7) was smaller than the coefficient of variation of the breast-height form factor (0.204 0),indicating that the experimental form factor was of good stability.2) one-way analysis of variance was used to study the form factor growth rhythm of different tree height levels and diameter at breast height (DBH) levels.The results showed that the breast-height form factor of single tree in Cunninghamia lanceolata plantation had significant differences at different DBH levels (sig<0.05),and they were negatively correlated;The experimental form factor were significantly different at different tree height levels (sig<0.05),and they were positively correlated.3) Pearson correlation analysis showed that there were some differences in the influencing factors between the breast-height form factor and the experimental form factor.The breast-height form factor was of extremely significant positive correlation with slope (p<0.01),was of significant positive correlation with slope position (p<0.05),and was of extremely significant negative correlation with altitude,stand age and DBH (p<0.01).The experimental form factor was of extremely significant negative correlation with altitude (p<0.01),and was of significant negative correlation with stand density and stand age (p<0.05),but was of extremely significant positive correlation with slope and tree height (p<0.01),and was of significant positive correlation with slope position and dry humidity (p<0.05).4) The results of multiple linear regression showed that the fitting effects of the two form factor models were significant (sig<0.05),the adjusted R ² of the breast-height form factor model was 0.417,and the experimental form factor model adjusted R ² was 0.495,indicating the regression equation can explaine 41.7% and 49.5% of the respective variation.

Key words: Cunninghamia lanceolata plantation, breast-height form factor, experimental form factor, site factors, correlation analysis