【摘要】 广东省韶关林场采用标准的采脂工艺,在其马尾松人工林进行了两年的初期采脂试验。 在这些马尾松的采脂树的采脂盘上,主要呈现泌脂和木材增生,而在其下方距离0.5m的影响盘上。仅有一些创伤轴向树脂道和树脂囊。创伤树脂道使其邻近的轴向管胞的形状不规则,又与树轴倾斜近45°。 从山中试验区不同的松树林分,在其对照盘(对照树的)、影响盘上,自髓向外每隔一个生长轮的离析材料;另在采脂盘上密切邻近采脂面两侧,自圆盘周围向内各选4轮材料;分别测定轴向管胞的长度,得知这些30(20)年生的马尾松树仍在幼态期间,其管胞长度一般是增加的;至于采脂面两侧的管胞却显出不同程度的减短,其中一些管胞呈现种种不规则形状。更多还原

【Abstract】 A pine plantation of Horse-tail pine, Pinus massoniana Lamb, located in the suburbs of Shaoguan in N. Guangdong has been chosen for resin tapping at intervals of one day from April to October in the years 1982 and 1983.After tapping, according to the south or north slope, the different stands and of 30 or 25 (20) years, 3 trees were cut as a group for every stand, among which two trees were tapped, and one was controlled. From the tapped tree, 2 wood discs were selected: one was at the breast height and named ’the affected disc’, another one was above the former from a distance of about 0.5m, and named ’the tapped disc’, of course, the disc has been taken at the breast height from the controlled tree and was named ’the controlled disc’. All wood discs have been made smooth with a plane.1.Macroscopic structure-Under a hand lens, in the middle of tapping surface of the tapped disc, both resinosis and wood proliferation are present; however, on the affected disc, only has some traumatic resin canals and resin pockets.2.Microscopic structure-Some permanent microscopic preparations were made: On the tapped disc, the traumatic canals generally are absent from the growth ring where it is in the vicinity of the tapped face. As to the affected disc, if traumatic canals are developing or have been formed, they caused the axial tracheids appearing in irregular form, i. e., they are at an incline |near 45?with the tree axis, especially when they are observed in the tangential longitudinal section (Fig. 5)3. Mean tracheid length-In order to determine whether the initial resin tapping had the influence on the wood structure of Horse-tail pine, 2 groups of trees of 30 years were selected on the middle from both the south and north slopes, and compared with the 20-year-old trees of the south slope. Macerated materials taken from the pith towards the periphery at intervals of one growth ring were prepared, and were measured by the use of a micro-projector. Cell length from 50 tracheids were measured at random for every ring, and their mean length calculated (Tables 1-3). By comparison, it is clearly that those tracheids which were in the neighbourhood of the tapped face of the tapped disc are decreased at various degrees. However籺he mean tracheid length of the controlled disc or the affected disc generally are increased, simply because these trees are not yet fully developed.Under the micro-projection, it may be seen that some tracheids appear to shorten, some are with a blunt end, some are abnormal; and some earlywood tracheids have larger diameter or with irregular forms. All these phenomena are more common on the margin close to the tapped face of the tapped disc.更多还原