| 一种新的估测林木现存量数学模型的探讨 |
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| 引用本文： | 余树全.一种新的估测林木现存量数学模型的探讨[J].河北林果研究,1992(3). |
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| 作者姓名： | 余树全 |
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| 作者单位： | 四川农业大学 |
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| 摘 要： | 本文利用相关系数(r)和剩余标准差(SD),探讨了6种不同数学模型估测柏木人工林现存量的效果。发现方程W=a+b_1D+b_2D~1+b_3DH+b_4H+b_5H~2是估测干材、树皮、枝、叶、根、地上部分、地下部分和全株现存量的最优模型,而且普遍适用于不同立地类型、林型和年龄的林分。并且对不同器官估测效果优劣进行了比较,结论是:干材>枝>叶>树皮>根。
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| 关 键 词： | 柏木 数学模型 现存量 |
THE DISCUSSION ON NEW MATHEMATICAL MODEL FOR ESTIMATING STANDING CROP |
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| Yu Shuquan.THE DISCUSSION ON NEW MATHEMATICAL MODEL FOR ESTIMATING STANDING CROP[J].Hebei Journal of Forestry and Orchard Research,1992(3). |
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| Authors: | Yu Shuquan |
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| Institution: | Sichuan Agricultural University |
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| Abstract: | Six new mathematical models for estimating the standing crop of cypress plantation are compared according to their correlation coeffi -cient(r) and surplus standard variation (Sd) in the paper. The formula W = a + b1D + b2D2 + b3DH + b4H + b5H2 appears to be the best for estimating the standing crop of trunk, bark, branch, foliage, root, stump, undergr Ound, aboveground-and single tree ; it can be used in different sites, forest types and age. Finally, the effectiveness of etimation is compared for different organs: trunk, branch, foliage, bark, stump and root. |
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| Keywords: | Cupressus funebris mathematical model standing crop |
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