西南林业大学学报2024，Vol.44Issue(3)：111-118,8.DOI:10.11929/j.swfu.202211083
基于哑变量的不同气候条件下红松树冠外部轮廓模拟研究
Simulation of the Outer Profiles of Pinus koraiensis Crown Under Different Climatic Conditions Based on Dumb Variables
摘要
Abstract
Abstact:This paper studied the Pinus koraiensis plantation of Dabiangou Forest Farm in Qingy-uan Manchu Autonomous County,Liaoning Province and Mengjiagang Forest Farm in Huanan County,Hei-longjiang Province,by selecting 39 and 24 sample trees in 2 climate areas for branch analysis.Measure the branch length,chord length,base diameter,branch depth of all branches,construct crown profile model of 2 P.koraien-sis regions based on dumb variables using R language,analyzing the influence of forest factors on crown profiles,and compare the differences of crown contour of P.koraiensis in the 2 climatic regions.The results show that among the power function,the segmented parabola function and the modified Kozak equation,the power function had the best fitting effect of tree crown profile,the power function equation was chosen as the basic model of tree crown profile;when only one of the other factors changed,the crown radius increased with the increase of DBH and CL,and decreased with HD,and CR had the least effect on the crown radius,followed by HD and DBH was the largest.Regional differences affected small trees the most,followed by medium trees,and smallest large trees;dominant crown radius＞intermediate crown radius＞supressed crown radius.The dumb variable model of the outer crown profile constructed in this study has a goodness-of-fit and can reasonably simulate and predict the out-er crown contour of red pine in 2 regions.关键词
树冠外轮廓/哑变量/树冠半径/红松Key words
outer crown profile/dummy variable/crown radius/Pinus koraiensis分类
农业科技引用本文复制引用
赵雪晗,高慧淋,郝元朔,李凤日..基于哑变量的不同气候条件下红松树冠外部轮廓模拟研究[J].西南林业大学学报,2024,44(3):111-118,8.基金项目
国家重点研发计划项目(2022YFD2201000)资助. （2022YFD2201000）
