摘要
针对常规角规测树较为粗放的现状,该文提出了电子角规测定森林蓄积量及生长量的基本原理与方法.电子角规是电子经纬仪与PDA的有机结合,电子经纬仪测角精确,配合相应的PDA应用程序,可以准确地实现角规的量测胸高断面积功能.电子角规可以实时准确地量测树木材积,从而可以计算各树形高值以计算林分蓄积量;此外,电子角规还可以准确地测量各棵树相对于样点的坡度以进行坡度改正.为了测量蓄积生长量,该文作者在样点设置固定标桩进行两期观测.为了合理地解释森林蓄积生长,该文采用潜在计数值法,它可以合理地计算出进界木在前期的潜在量,林分实际生长量等于保留木、潜在木和进界木生长量之和.
To decrease the error of surveying tree using general angle gauge,the authors put forward the basic theory and method of surveying forest volume and increment with electronic angle gauge.The electronic angle gauge is the organic combination of electronic theodolite and personal digital assistant(PDA).It can accurately survey the forest basal area by reason of precise angle-surveying of electronic theodolite and corresponding PDA program.Through real-time and accurately surveying tree volume,electronic angle gauge can account the form height of the tree,accordingly,it can account forest volume.Moreover,electronic angle gauge can accurately survey the grades between trees and angle gauge point for grade rectification.The authors set up fixed stake and surveyed twice on it to abtain forest volume increment.To reasonably explain the increase of forest volume,the authors introduced the method of latent number counting,which can reasonably account the latent volume of ingrowth trees on prophase.Forest volume increment is the increment sum of reserved tree,ingrowth tree and latent tree.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2007年第S2期40-44,共5页
Journal of Beijing Forestry University
基金
山东省重大科技专项(2006GG1108097-21)
关键词
电子角规
潜在计数值法
森林蓄积量
生长量
electronic angle gauge,latent number counting method,forest volume,increment
