THE COMPARISON STUDY ON THE WOOD PROPERTIES OF THREE FORMS OF PINUS MASSONIANA LAMB. OF GAOZHOU, GUANGDONG PROVINCE

Pinus massoniana Lamb. grown in Gaozhou, Guangdong Province is divided into three forms because of the bark of the tree thicker or thinner, the resin production higher or lower and the extending condition of branches, i. e., the black scale bark pine, the yellow scale bark pine and the weeping branch pine. It was undertaken to study and compare the wood properties of the three forms of masson pine in this paper to find out their differences and qualities rf anatomy and physical mechanical properties. The results show that the black scale bark pine has the darker bark, higher rate of late wood, longer tracheid length and much more resin canal, the yellow scale bark pine has the thicker tracheid cell wall and higher strength properties) the weeping branch pine has the lower figure in all properties except the ring width. But according to the tests of analysis of variances there are no certain differences occurred in wood anatomy and physico-mechanical properties among the three forms of masson pine. However, there are differences or significant differences occurred in wood properties in the single trees. It is advised that, when we select the fine varieties from masson pine, don't make a choice among the forms but should select from the single trees which have the good qualities.