Abstract:

In this paper，three Masson Pine(Pinus massoniana) plantation(Bagongshan pure plantation and mixed plantation，and Shaheji pure plantation) which under different growth conditions were selected as researching materials. The growth traits of totally twenty four trees in three different stem shape(straight，lean，curve) were measured firstly，and the drilled hole method was implemented to determine the longitudinal growth stress at different relative position of periphery of trunk subsequently. The relationship between growth traits and longitudinal growth stress was analyzed further，the result indicated: The multivariate ANOVA suggested one of main effects，relative position at periphery，significantly affected growth stress indicator(GSI) at 0.001 levels. One of dualistic interaction between relative position at periphery and subsection factor of tree height also had significant effect on the GSI at 0.05 levels. There no other effects had been found to hold obvious relationship with GSI. The partial correlation coefficient between GSI and all growth characters of straight tree were unobvious. In the leaned tree，significant partial correlation was found between relative position of periphery and GSI at 0.05 levels，and no other apparent correlations could be detected in leaned tree. Similar partial correlations were found in curved tree. When result of both multivariate ANOVA and partial correlation analysis were considered comprehensively，the general information suggested that ratio of tree height to diameter at breast height(DBH) of tree，leaned angle and parameters of crown shape could direct influence longitudinal growth stress of periphery of trunk at some extent，however，the degree of effect varied among three different trunk shapes. Thereafter，thining could reduce the ratio of tree height to DBH，and decrease the growth stress of straight and curved Masson Pine tree accordingly. In addition，the severity and distribution of longitudinal growth stress of leaned pine tree could be modified partly by controlling the leaned angle and the parameters of crown shape.

Key words: Masson Pine(Pinus massoniana), growth traits, growth stress, relationship