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选择Richards生长函数作为吉安地区湿地松林林分优势高和林龄导向曲线建模的基本模型,采用标准差法、变动系数法、相对树高法、比例法、差分方程法和多形曲线等展开成地位指数曲线.通过拟合精度检验,结果表明:①将单形导向曲线方程展开成地位指数表的几种现行方法,其结果差异较大:②由于不同地位指数优势高的生长过程曲线簇存在多形特征,多形模型的预估精度明显高于单形模型,因此,在一般情况下,应以建立多形模型为宜.
The Richards growth function was selected as the basic model of Pinus elliottii plantation superiority and age-dependent curve modeling in Ji’an. The standard deviation method, coefficient of variation method, relative tree height method, proportional method, difference equation method and polymorphic curve were used to develop Richards growth function The results show that: ① Several monopod-oriented curve equation developed into the status index table of several current methods, the results vary greatly: ② due to the different status index of the growing advantage of the high growth process curve clusters There are polymorphic features, and the prediction accuracy of polymorphic models is obviously higher than that of simplex models. Therefore, in general, it is appropriate to establish polymorphic models.