北京林业大学学报2016，Vol.38Issue(6)：1-7,7.DOI:10.13332/j.1000--1522.20150339
兴安落叶松枝条特征联立方程组模型及树冠形状模拟
Model systems of branch characteristics and crown profile simulation for Larix gmelinii
摘要
Abstract
The objectives of this study were to develop the equation systems of branch diameter, branch length and branch angle for natural Dahurian larch ( Larix gmelinii ) using the error-in-variable simultaneous equation approach, and to compare four parameter estimation approaches. The data were collected from 2 306 branch samples of 36 trees in Songling Forest Bureau in Daxing’ anling. The results showed that the Seemingly Unrelated Regression ( SUR) approach could explain the correlation of error terms across the equations and decrease standard error of parameter estimation. Equation systems of branch characteristics established in our study show better precision and can better describe variation of branch characteristics and crown profile. In addition, our study also developed equation systems of branch diameter, branch length and branch angle with stand density variables using nonlinear mixed-effects modeling techniques. Stand density has a significant impact on branch diameter, branch length, branch angle and crown profile based on significant parameter estimates and better precision.关键词
枝条特征/树冠形状/联立方程组/兴安落叶松Key words
branch characteristics/crown profile/equation systems/Larix gmelinii分类
农业科技引用本文复制引用
姜立春,潘莹,李耀翔..兴安落叶松枝条特征联立方程组模型及树冠形状模拟[J].北京林业大学学报,2016,38(6):1-7,7.基金项目
“十二五”国家科技支撑计划项目(2012BAD22B0202)、国家自然科学基金项目(31170591、31570624)。 （2012BAD22B0202）
