A New Method for Establishing Richards Polymorphic Site Index Model:Parameter Replacement

HUI Gang-ying; ZHANG Lian-jin; HU Yan-bo; ZHAO Zhong-hua

A new method for establishing Richards polymorphic site index model was developed. And the Cunninghamia lanceolata was taken as an example. Data from stem analysis of 164 trees were used. It shows that the Richards polymorphic site index model can be directly derived by using the difference equation. This model has no systematic error when the base-age(T) is relatively low (T=4), therefore, be selected as the final model, and its parameter values are close to the parameter values of the guide curve. So parameters of this model were replaced by the parameters of guide curve. The five indicators: mean absolute error(MAE), mean relative error(MRE), root mean squared error(RMSE), coefficient of determination(R2) and adjusted coefficient of determination(R2adj) were selected to analysis the validity of this parameters replacement. The results showed that they were almost identical among the various indicators before and after replacement. Hence, the method for using the parameters of guide curve to directly replace the parameters of polymorphic curve model is feasible. This result provides a possibility for the site quality evaluation by using the investigation data of age-height about temporary sample plot or interval data without site index table in advance. And it also provides a method for establishing polymorphic site index model directly through the guide curve.

1. Research Institute of Forestry,Chinese Academy of Forestry

Abstract: A new method for establishing Richards polymorphic site index model was developed. And the Cunninghamia lanceolata was taken as an example. Data from stem analysis of 164 trees were used. It shows that the Richards polymorphic site index model can be directly derived by using the difference equation. This model has no systematic error when the base-age(T) is relatively low (T=4), therefore, be selected as the final model, and its parameter values are close to the parameter values of the guide curve. So parameters of this model were replaced by the parameters of guide curve. The five indicators: mean absolute error(MAE), mean relative error(MRE), root mean squared error(RMSE), coefficient of determination(R2) and adjusted coefficient of determination(R2adj) were selected to analysis the validity of this parameters replacement. The results showed that they were almost identical among the various indicators before and after replacement. Hence, the method for using the parameters of guide curve to directly replace the parameters of polymorphic curve model is feasible. This result provides a possibility for the site quality evaluation by using the investigation data of age-height about temporary sample plot or interval data without site index table in advance. And it also provides a method for establishing polymorphic site index model directly through the guide curve.

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A New Method for Establishing Richards Polymorphic Site Index Model:Parameter Replacement

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