摘要
本文采用相对高d_(0.1)预估模型导出树干表面积式,然后乘以树干平均年轮宽度推出了立木材积连年生长量模型,最后将平均年轮宽度转换成平均直径生长量。此模型中采用胸径、树高与平均直径生长量三个因子预测立木材积连年生长量,测算方便,应用简单。选用模型Z_v=d_(1.3)(α_0h^(-3)+α_1h^(-2)+α_2h^(-1)α_3)hZ_d,相对系统误差不超过±1.72％。各树种模型的误差不超过±2.54％,应用精度均较高。立木材积连年生长量随立地质量好坏而变,因此必须分别地位级建立立木材积连年生长量模型。
Tree stem surface area formula was derived by predicting model with relative height d 0.1. Multiply it by stem mean annual ring with an annual volume growth model of standing tree was then derived. The mean ring width was calculated to mean diameter growth. This annual volume growth model was predicted by using breast height diameter, height and mean diameter growth. The measurement is simple and convenient. By using Zv = d1.3 (a0h-3 + a1h-2 + a2h-1 +a3) hzd, the relative systematic error C% is ?±1.72%. C% of each tree species model is ?±2.54%. Applying precisions are all high. Annual volume growth of standing tree varied with site qualities. Thus annual volume growth model of standing tree must be constructed according to site classes.
出处
《西北林学院学报》
CSCD
1991年第2期22-29,共8页
Journal of Northwest Forestry University
关键词
立木
材积
生长量
相对区分法
模型
annual volume growth of standing tree
mean ring width
mean diameter growth
surface area
relative sectional measurament
model
