摘要
山东省临沂地区杨树人工林林分密度管理图,于1986年冬至1987年春在该地区设置69杨等临时标地356块资料基础上编制而成。密度为278—5952株/ha(其中500—1894株/ha者占89.1％);优势高为5.9—28.6m;平均胸径为3.8—28.6cm;蓄积量为3.9—339.7m^3/ha。管理图编制方法:等树高线选用M^(-1)=A_1+B_1N^(-1)式,等直径线选用D^(-1)=A_2+B_2N式;最大密度线采用M_(Rf)=K_2·N_(Rf)^(K_1^′)式;密度管理线采用M_(Ry)=K_3·N_(Ry)^(K_1^′)式。本密度管理图的精度,等树高线为97.6％;等直径线为98.9％,符合生产要求。
Data of 356 temporary sample plots of intensively cultivated poplar plantations (Populus deltoides cv. 'Lux' I-69/55) were collected for establishment of stand density control diagram. The densities of poplar plantation ranged from 278 to 5952 plants per ha.. Among all 317 sample plots, the densities are ranging from 500 to 1894 plants per ha., accounting for 89.1%. The dominant height varied from 5.9 to 28.6m, the average D. B. H. 3.8-28.6cm, the volume per ha. 3.9-339.7 m. The formularsused are as follows: for equivalant height curve,for equivalent diameter curve, for full density curve, for density control curve. The accuracy of the stand density control diagram is 97.6 for equivalent height curve, 98. 9% for equivalent diameter curve.
出处
《林业科学研究》
CSCD
北大核心
1989年第5期469-476,共8页
Forest Research
关键词
杨树
人工林
林分
密度
管理图
poplar plantation
stand density control diagram
