白河林业局单木枯损模型研究

Individual Tree Mortality Model For Baihe Forestry Bureau

利用白河林业局1990年2、000年10年间二类调查数据,整理出复位样地7个主要树种(组)的单木枯损数据,通过逐步回归和变量筛选的方法,用Logistic模型形式拟合7个树种(组)的单木枯损模型,结果表明,林木的直径大小是影响枯损概率的最重要因子,它们之间呈递减的关系。

Using the data of forest investigating in Baihe Forestry Bureau from 1990 to 2000 with a interval of 10 years, the study handled the mortality dataset of 7 major species （or groups） in re - measured permanent sample plots, and using the form of Logistic to estimate individual tree mortality models of 7 major species （groups） with a method of stepwise regression and variables filtration, the result indicates the size of tree diameter is the most important factor which effects mortality probability and the relationship between them is descending trend.