橡胶树(Hevea brasiliensis Muell.—Arg.)属大戟科(Euphorbiaceae),原产巴西,它是生产天然橡胶的主要树种。据有关资料记载,现巴西以生产橡胶木材为主要目的。橡胶树生长迅速,20年生胸径可达20多厘米。20多年生的胶树,产胶量急剧下降需要更新。为了使橡胶树木材得到合理利用,为此,我们进行了木材物理力学试验。所测定的数据供用材部门参考。试材于1980年12月5日在河口蚂蟥堡六分场一队设置橡胶林标准地2亩中采集。其海拔370米,坡向西北,坡度20度,黄棕色沙壤,pH6,土层厚度1米以上,排水良好,为人工栽植的橡胶纯林,郁闭度0.5,平均林龄23年,平均胸径24厘米,平均树高16米,地位级Ⅱ。采集标准木为5棵,平均树龄23年,平均胸径29厘米,平均树高19米,生长 Hevea brasiliensis Muell.-Arg. Belongs to the genus Euphorbiaceae, originating in Brazil. It is the major tree species for the production of natural rubber. According to the information records, Brazil is the main purpose of the production of rubber wood. Rubber trees grow rapidly, 20-year-old breast diameter up to more than 20 cm. Twenty perennial gum trees, a sharp decline in the amount of plastic production needs to be updated. In order to make rational use of rubber tree timber, therefore, we conducted a physical and mechanical testing of wood. The measured data for timber sector reference. Specimens in December 5, 1980 in the estuary Fort Le Beijiao a team set up 2 acres of rubber plantation standard acquisition. The elevation of 370 meters, northwest slope, slope of 20 degrees, yellow brown sandy soil, pH6, soil thickness of more than 1 meter, well drained, artificial rubber plantation, canopy density 0.5, average age of 23 years, average DBH 24 cm, the average height of 16 meters, status level Ⅱ. Collection of standard wood to 5, the average age of 23 years, an average diameter of 29 cm at breast height, the average height of 19 meters, growth