乳源木莲的分枝特性与调控技术

以乳源木莲纯林为对照，对10年生杉木、乳源木莲混交林的分枝特性进行分析，提出培育优质干材的调控技术。结果表明：乳源木莲分枝生长具有本身特性，其耐荫性强，枝下高低，具有分叉干现象，影响干形质量。乳源木莲通过修枝，树高提高5．7％，胸径降低5．7％；修枝后乳源木莲的胸高形率为0．51，高径比为1．05，枝粗指数为0．33，而未修枝的胸高形率为0．57，高径比为0．93，枝粗指数为0．21；人工接于后乳源木莲接干率为73％，通直率达87％，接干形率为0．87，树高提高33．3％，胸径降低4．4％。可见，乳源木莲通过修枝和人工接干，树干通直圆满，可以缓解分叉干现象，提高了木材质量。

Branching characteristics and control technology of Manglietia yuyuanensis

Using the pure forest of Manglietia yuyuanensis Law as the control, this paper analyzed branching characteristics of the 10-year-old mixed forest of Chinese fir and M. yuyuanensis, put forward the control technology in cultivating high-quality M. yuyuanensis bole. The results showed that M. yuyuanensis had its own branching-growth characteristics, such as a strong ability of shade tolerance, the low branch height level and the bifurcation phenomena, which affected the dry quality. Through trees pruning, tree height increased 5.7 percent, diameter shortened 0.93 percent. After pruning the chest-height rate was 0.51, height-diameter rate was 1.05, sticks width index was 0.33; on the other hand, without pruning, the chest-height rate was 0.57, height-diameter rate was 0.93, sticks width index was 0.21. With artificial trunk, M. yuyuanensis stem rate reached 73%, straight rate reached 87%, dry-rate was 0.87, tree height increased 33.3%, diameter shortened 4.4%. Clearly, M. yuyuanensis trunk which was pruned and artificially trunk-extended was straight and plump, and could reduce bifurcation phenomena, so as to improve the quality of the wood.