用嫁接的方法建立杉木种子园,遇到的一个问题,就是接株大多数都是呈侧向生长,即呈单枝或多枝倾斜生长。这一现象随着接株年龄的增长有逐步转向直立生长的趋势。如1965年我们对64、65两年的642株接木进行调查,直立生长的类型占1.8%; 1967年对同一样地706株接木进行调查,有107株已形成塔形冠,直立生长 One of the problems encountered with the establishment of Chinese fir seed orchard by grafting is that most of the seedlings are grown laterally, that is, single or multiple branches grow obliquely. This phenomenon with the growing age of the strain has gradually turned to erect growth trend. For example, in 1965 we surveyed 642 trees in 64,65 years, and the type of upright growth accounted for 1.8%. In 1967, 706 trees of the same plot were surveyed, and 107 of them were tower-shaped crowns, standing upright