樟子松人工林一级枝条基径和枝长模型的研究

以东北林业大学帽儿山实验林场樟子松人工林为研究对象，采用枝解析的方法，于2002年、2003年测定了53株林木（年龄17~38 a，直径8.61~21.5 cm，树高7.48~18.24 m）的树冠变量，建立了基于总着枝深度（DINC）和树冠内一级枝条基径（BD）、枝长（BL）的预估模型。对于大小相同树木的一级枝条， 这些树冠变量随着DINC的增加而增大，而林木的胸径（DBH）、树高（HT）变量又很好地反映了不同大小树木的基径和枝长的变化。采用独立检验样本对构建的树冠内一级枝条基径和枝长模型进行了拟合统计量和精度检验，结果表明：模型预测效果良好，精度均达到95%以上。构建的一级枝条基径和枝长模型为进一步合理地描述樟子松人工林树冠的形状及其变化以及三维可视化经营提供依据。

Modeling for Primary Branch Length and Branch Diameter of Mongolian Scots Pine Trees

Models for estimating primary branch length and branch diameter within live crown were developed in Mongolian Scots Pine plantation in Maoershan experiment farm of northeast forestry university. Data of crown attributes were collected from 2002 to 2003 and from 53 sample trees ranging from in age from 17 to 38 a，diameter at breast height(DBH) from 8.61 to 21.5 cm and total height(HT) from 7.48 to 18.24 m .This crown attributes of primary branches for a specified tree increase with the depth into crown (DINC) increasing. DBH and HT were adequate variables of tree for summarizing the effects of branch length and branch diameter. The test result using Deviance Statistical and Precision tests from the independent test data set showed that these models were suitable for predicting the primary branch length and branch diameter in Mongolian Scots Pine trees and models precision exceeded 95 percentages. Overall, the models were suitable in describing the trends and inherent variability of crown profiles for Mongolian Scots Pine plantation and in three dimensional visualization management.