基于树高-年龄分级的广东木荷生长模型研究

Growth Model of Schima superba in Guangdong Based on Tree Height-Age Classification

摘要: 以广东90株不同径阶木荷伐倒木(其中40株树干解析木)为研究对象，采用Logistic、Gompertz、Richards、Korf 4种经验生长模型对树高-年龄进行分级，并对未分级和分级的广东木荷单木胸径、树高和材积进行建模，通过调整后拟合优度、平均误差、平均绝对误差和均方根误差4个指标对2类模型进行评价和比较，并从中选出最优模型。结果表明：木荷胸径、树高、材积未分级最优的拟合方程都为Gompertz模型。采用分级方法的模型与未分级方法的模型效果不尽相同，分级方法构建的木荷胸径、树高、材积模型的拟合效果优于未分级方法构建模型的效果。

Abstract: Based on the material of 90 strains of different diameter Schima superba felled in Guangdong, the growth model of different site grade of Schima superb was constructed. The site quality classification was determined by using the tree height-age model. A total of 4 empirical growth models were used to model the DBH, height and volume and the optimal model was selected by evaluating and comparing R_adj², ME, MAE and RMSE. The results showed that the best equations to simulate the growth process of DBH, tree height and volume were the equations of Gompertz. The optimal model of classified and unclassified method is different, the fitting models of using classified method in DBH, tree height, volume model were better than unclassified method.