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影响立木材积的因子不仅仅是直径,树高两个因子,干形是单株材积中第三个决定性的因子,但把干形因子引进材积表,在实际测量及预估中既浪费时间,又不经济,所以任何干形的测量在材积预估中都没有实际意义。我们应用的材积表,在编表时每株树都看作具有平均材积——胸径关系中的一定群体中的一株,实际上来自不同地区、不同种源、不同经营管理水平的树木材积——胸径的关系是不一致的,只有当被测树木的干形十分相似于编表所用树木的于形时,这个材积表才能正确地预估材积。鉴于此可以通过模型识别来提高材积预估的准确性。树木干形特征包括了一套相互依存的比率关系。所以模型识别必须在多维分析的基础上进行。
The factors that affect the standing volume are not only the diameter and the height of the tree. Drying is the third decisive factor in the volume of a single plant. However, introducing the dryness factor into the volume chart can waste time in the actual measurement and estimation. Not economical, so any dry measurement in the volume estimate is not meaningful. We use the volume chart, each tree at the time of tabulation as a tree with a mean volume-DBH relationship in a group, in fact from different regions, different provenance, different levels of management of the tree volume - - The relationship between the DBH is inconsistent. The volume chart can only correctly predict the volume if the measured dryness of the tree is very similar to the shape of the tree used in the table. In view of this, the accuracy of volume estimation can be improved by model recognition. The dry features of trees include a set of interdependent ratios. Therefore, the model identification must be based on multidimensional analysis.