杉木人工林优势高生长模拟及多形地位指数方程

采用差分法构建以Korf等 6种理论生长方程为基础的多种多形地位指数方程 ,探讨它们的多形表达涵义 ,并对其模拟性能进行了较为全面的分析 ,得到结论 :(1)基于理论生长方程 ,通过差分法可以构建具有良好生物学基础的多形优势高方程 ;(2 )理论生长方程的拐点取值情形对其模拟优势高生长的精度具有至关重要的影响作用 ;(3)差分方程较方程原型更适合于大范围数据的拟合 ,如数据基础为地区或产区层次时 ,其拟合效果明显要好 ;(4 )多形优势高方程展现出了较高的模拟精度 ,其中以Korf、Richards、Weibull方程的 2参数多形表达式及Sloboda方程的 3参数多形表达式为佳 ,采用优良的多形优势高生长模型可以构建说理性完备的多形地位指数方程。

Modeling of Dominant Height Growth and Building of Polymorphic Site Index Equations of Chinese Fir Plantation

The paper adopted difference methods to build the polymorphic site index equations based on six theoretical growth equations such as Korf, further explored their polymorphic meaning, and analyzed their modeling qualities, finally got several main conclusions: (1) Based on theoretical growth equations, through difference methods the polymorphic dominant equations can be built and have good biological basis; (2) The inflection points of theoretical growth equations have very important effect on their modeling precision of dominant height; (3) Difference equations have better modeling effect on the big range of region; (4) The polymorphic dominant height equations, such as the two-parameter polymorphic forms of Korf, Richards, Weibull and three-parameter polymorphic form of Sloboda, showed higher precision, the polymorphic site index equations with good theoretical basis can be built when excellent polymorphic dominant height growth models are adopted.