选择黑龙江省帽儿山林场天然次生林内176株10个阔叶树种的解析木,共收集了3401个枝条的详细数据,建立了一种树冠轮廓模型。分析发现,树冠的形状随着枝深度变化,在树冠上部、中部逐渐扩展,在下部收缩,每个树种呈现不同的曲线形式,天然次生林主要阔叶树种树冠模型可分为上中层和下层两部分建模,上中层模型为h_RPCA=ao+a1/ln(R_B)+a2/ln(R_B)^2+a3/ln(R_B)^3,下层轮廓模型因种不同而有不同,即h_RPCB,白桦=b0+b1·(exp(b2)·ln(R_B)-1)/b3;h_RPCB,黄菠萝=b0+b1·ln(R_B)+b2·ln(R_B)^2; h_RPCB,其他=b0+b1·ln(R_B)+b2·ln(R_B)^2+b3·ln(R_B)^3。经过验证,所建立的树冠轮廓模型拟合和检验效果较好,相关系数都在0.97以上。
A simple crown profile model for 10 broad-leaf species in secondary forest collected from Mao'er Mountains in Heilongjiang province was developed using the data of 3 401 living branches from 176 stems. The shape of crown varied along with the depth into crown (CDIN ) which expanded at the upper, middle parts of the crown, however, shrank at the lower area, the main model could be categorized into the profile model of upper, middle crown( h_RPcA = a0 +a1/ln R_B+a2/ln(R_B)^2+a3/ln(R_B)^3) and the profile model of lower crown h_RPCB,birch= b0 + [ b1· ( exp ( b2 )·ln ( R_B ) - 1 ) ]/b3 ; h_RPCB,phellodendri= bo0+ b1·ln ( R_B ) + b2· ln ( R_B )^2 ; h_RPCB,other= b0 + b1·ln ( R_B ) + b2·ln ( R_B ) 2 + b3·ln ( Rs )^3. The fitting and validation of these crown profile models performed very well and the correlation coefficients were all greater than 0.97.