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探讨了划分林木干形质量的标准,将林木干形质量分为通直、轻度弯曲、二杈分枝、多杈分枝和重度弯曲5类干形。选择了胸径、树高、冠幅、冠长等6个因子,并研究了这6个调查因子随干形质量变化的关系。通过方差分析发现不同干形质量的林木胸径差异并不明显,而其它的调查因子却因干形不同而表现出显著差异。对表现显著的林分因子进行多重比较研究,发现通直干形生长得较高、有较小的冠径比;二杈分枝和多杈分枝林木的冠幅较大,且二杈分枝类型林木的高径比最小。可以得出结论:在近自然经营过程中,在选择以材质为目的的目标树时,首先考虑干形通直的林木。
The criteria for dividing dry wood quality were discussed. The dry wood quality was divided into straight, mild bending, two-branch, two-branch and severe bent five categories. Six factors, including diameter at breast height, tree height, crown width and crown length, were selected and the relationship between these 6 factors and dry weight was studied. By variance analysis, it was found that there was no significant difference in DBH of different dry quality, but other survey factors showed significant differences due to different dryness. Multiple significant comparison was made on the stand factors that showed remarkable growth. The results showed that the stems grew higher and had a smaller crown diameter ratio. The crown widths of two-branch and more-branch branches were larger, Tree branches of the aspect ratio of the smallest. It can be concluded that in the process of natural management, when selecting the target tree for the purpose of material quality, we first consider the dry and straight forest.