| 各相对高处直径与胸径之间相关关系的研究 |
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| 引用本文： | 杜纪山,李悦黎. 各相对高处直径与胸径之间相关关系的研究[J]. 西北林学院学报, 1989, 4(2): 25-32 |
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| 作者姓名： | 杜纪山 李悦黎 |
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| 作者单位： | 西北林学院林学系(杜纪山)，西北林学院林学系(李悦黎) |
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| 摘 要： | 用陕西主要林区油松的标准木材料,拟合了相对高处直径与胸径之间的关系式(d_(θ·nh)~2)/(d_(1·3)~2)=a bh(0.n=0.0,0.02,0.04,0.06,0.08,0.1,0.15,0.2,0.25,d_(1.3)0.3,0.4,0.5,0.6,0.7,0.8,0.9),该式符合树木生长规律: 当h<(1.3)/(0.n)时,(d_(θ·nh)~2)/(d_(1·3)~2)>1,即d_(θ·nh)>d_(1·3); 当h=(1.3)/(0.n)时,(d_(θ·nh)~2)/(d_(1·3)~2)=1,即d_(θ·nh)=d_(1·3); 当h>(1.3)/(0.n)时,(d_(θ·nh)~2)/(d_(1·3)~2)<1,即d_(θ·nh)
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| 关 键 词： | 林木 干形 相对 直径 胸径 相关关系 |
A Study on Correlation Between D.B.H and Diameter of Each Relative Height |
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| Du Jishan Li Yuelil. A Study on Correlation Between D.B.H and Diameter of Each Relative Height[J]. Journal of Northwest Forestry University, 1989, 4(2): 25-32 |
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| Authors: | Du Jishan Li Yuelil |
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| Affiliation: | Dept. of Forestry |
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| Abstract: | The related expressions between d.b.h and diameter of each relative height. d2n.nh]/d21.3 = a bh (0.n=0.0, 0.02, 0.04, 0.06, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9) were fitted by sample trees of Pinus tabulaeforms in main forest regions of Shaanxi Province.They accord with the growth law of trees (1) h<1.3/0.n, d2 0 .nh/d21 . 3 > 1, i. e.d0.nh>d1.3; (2) h=l.3/0.n, d20.nh,/d2,.,= 1, i.e.dnh = d1.3; ( 3) h> 1.3/0.n, d20.nh/p21.3
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| Keywords: | tree form relative-height diameter bleast-height diameter correlation |
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