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多年来,人们对橡胶树分枝问题进行了多方面的试验研究工作.而生产上如何调节和利用幼树分枝习性,使其发挥较大的效应呢?我们的初步试验结果表明,橡胶树定植后第二年植控制分枝,当年茎围增长量比未分枝(或植后第三年分枝)的大三公分以上,此后每年绝对增粗量始终保持较好水平;而且促进了其他有关生长性状的相应变化.一般地说,这些变化是有利于早产、高产与抗寒的.材料与方法1974年以来,我们在林下林场进行一些试验.对试区四个林段中的天任31—45,东试93—114两个无性系的不同定植年份及同时定植而植后自然分枝时间不一的幼树,分别编号和观测.与此同时,人工诱导幼树分枝试验区也作了同样的试验观测,取得有关数据.以当年四或五月初前的分枝时间为数.
Over the years, people have carried out many aspects of rubber tree branching test work, and how to regulate the production and use of sapling habits, to make it play a greater effect? Our preliminary results show that the rubber tree after planting In the second year of planting control branches, the annual growth of stem circumference was larger than that of the unbranched branches (or the branches in the third year after planting), and the annual absolute thickening amount remained relatively good since then; and other relevant In general, these changes are conducive to premature birth, high yield and cold resistance.Materials and methods We conducted some experiments in Linxia Forest Farm since 1974. We found that Tianren 31-45, East Test 93-114 two colonies of different colonization years and at the same time planting and the natural branching time after planting young trees were numbered and observed separately at the same time, the artificial induction of sapling branch test area The same experimental observation was also made and the data were obtained, using the time of the branch in early April or early May of that year.