森林工程2017，Vol.33Issue(3)：33-38,6.
大兴安岭地区天然兴安落叶松疏开木冠幅预测模型
Modeling Crown Width for the Opening-grown Trees of Natural Larix Gmelini Plantation in Daxing`an Mountains
摘要
Abstract
Based on the investigation data for the natural Larix gmelini plantationfrom ten forest bureaus in Daxing'an Mountains,the diameter at the breast height(DBH)and the crown width from four directions(i.e.,east,west,south and north)for all the opening-grown trees in the sample plots were measured.The relationship between the DBH and crown width was analyzed.The linear equation and nonlinear equation were used as the basic models to develop the predicted crown width model for the natural Larix gmelini plantation and the optimal model was selected based on the goodness-of-fit and validation results.All the sample trees were classified into three categories(DBH≤20cm,20cm<DBH≤40cm,DBH>40cm)based on the diameter class.Using the optimal model selected by the goodness-of-fit and validation statistics,the dummy variable approach was employed to develop the general common crown width model for the three classes.The differences of crown width between the three categories were further analyzed.The results showed that both of linear and nonlinear equations were suitable to model the crown width of natural Larix gmelini plantation in Daxing'an Mountains.Considering the goodness-of-fit and validation statistics,the nonlinear equation was finally selected as the best model.The general common crown width model for the three categories of the natural Larix gmelini plantation was CW=(0.353 3G1+0.225 5G2+1.537 6G3)DBH(0.587 5G1+0.738 5G2+0.190 4G3).The parameters of DBH≤20 cm,20 cm<DBH≤40 cm were significantly different from 0,while the parameters for the DBH>40 cm were not passed the t test.关键词
天然兴安落叶松林/冠幅预测模型/哑变量/大兴安岭地区Key words
Natural Larix gmelini plantation/crown width predicted model/dummy variable/Daxing'an mountains分类
交通工程引用本文复制引用
张树森,贾炜玮,王玉霞,高慧淋..大兴安岭地区天然兴安落叶松疏开木冠幅预测模型[J].森林工程,2017,33(3):33-38,6.基金项目
横向课题(黑龙江省市县林区森林植被空间分布及多样性研究) （黑龙江省市县林区森林植被空间分布及多样性研究）
黑龙江省林业厅项目(黑龙江省森林可持续经营试验示范区建设) （黑龙江省森林可持续经营试验示范区建设）
大兴安岭地区科技计划项目(大兴安岭林区林分密度调控技术研究及示范) （大兴安岭林区林分密度调控技术研究及示范）
