| 用Richards函数拟合柳杉林多形地位指数曲线 |
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| 引用本文： | 陈鑫峰. 用Richards函数拟合柳杉林多形地位指数曲线[J]. 北京林业大学学报, 1997, 19(3): 8-14 |
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| 作者姓名： | 陈鑫峰 |
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| 作者单位： | 北京林业大学森林资源与环境学院 |
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| 摘 要： | 该文从生物学和数学两方面论述了采用Ｒｉｃｈａｒｄｓ方程拟合柳杉高生长曲线的适合性．以曲线的拐点年龄为基础分析了柳杉高生长在其指数级间和指数级内的多形性特征．通过图表分析和数值运算确定以６参数Ｒｉｃｈａｒｄｓ方程作为拟合柳杉林多形地位指数曲线的基本模型，并采用Ｍａｒｑｕａｒｄｓ迭代法求出各参数值，然后将模型展开得到柳杉林多形地位指数表．经检验所建立的柳杉林多形指数模型具有较高的精度
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| 关 键 词： | Richards方程，地位指数曲线，柳杉，地位指数，多形性 |
The Establishment of Polymorphic SI Curves of Chinese Cryptomeria by Using Richards Function |
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| Chen Xinfeng. The Establishment of Polymorphic SI Curves of Chinese Cryptomeria by Using Richards Function[J]. Journal of Beijing Forestry University, 1997, 19(3): 8-14 |
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| Authors: | Chen Xinfeng |
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| Abstract: | The fitness of using Richards Function in this work is testified on basis of biology and mathmatics.According to the ages at SI curves' turning points,the polymorphism between SI and within SI is discussed.With illustration and calculation,a 6 parameter Richards equation is confirmed to fit the polymorphic SI curves of Chinese Cryptomeria .The Marquards iteration is adopted to get the parameter values,meanwhile the model is obtained.A polymorphic SI table of Chinese Cryptomeria forest is gained by spreading out the model.Test shows that this model has a high precision. |
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| Keywords: | Richards equation polymorphic SI curves Chinese Cryptomeria site index polymorphism |
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