秃杉人工林树冠体积及表面积模型研究
首发时间:2015-04-01
摘要:根据秃杉人工林标准地调查数据,采用分层切割法计算秃杉树冠体积和表面积,通过分析因变量与自变量的相关性,筛选最优因子,结合异速生长方程构建秃杉树冠体积以及表面积模型。研究结果表明:秃杉树冠体积、表面积均与胸径、冠幅、冠长等林木因子呈显著相关,与胸径、树高、冠长、冠幅呈明显的幂函数关系,并随林木因子的增大而增大。树冠体积与树冠表面积比值随着胸径的增大而增大,以二次方程模拟树冠体积与表面积比较优。经检验,所构建的模型拟合效果较好,预估精度达86 %以上,可为预估林分的生长和合理经营提供一定的参考价值。
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Studies on the Crown Volume and Crown Surface Area Models of Taiwania cryptomerioides Plantations
Abstract:According to the standard survey data of Taiwania flousiana plantation, the main-axis cutting method is used to calculate volume and surface area of Taiwania flousiana gaussen, by analyzing the correlation between independent variables and the dependent variable, choose the optimal factor, then combined with the allometric equation to build volume and surface area of Taiwania flousiana crown model. Study results showed that Crown volume and surface area of Taiwania flousiana and forest factors such as tree diameter at breast height, Crown width, and Crown length were significantly correlated, and diameter at breast height, tree height, Crown length, Crown lies in the power function, and increases with the increase factor of forest trees. Crown volume and Crown surface area ratio increases with the increase of diameter at breast height, Crown volume and surface area of quadratic equations to simulate. Upon inspection, better constructed models, prediction accuracy of 86% or more, can provide estimates of stand growth and reasonable management provided some reference value.
Keywords: Taiwania cryptomerioides crown volume crown surface area model
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