海口市10种行道树最优生长模型研究

行道树是城市园林植物的重要组成部分，研究其科学合理的种植密度对于城市园林植物的规划设计和管理养护具有重要意义。以海口市建成区椰子等10种行道树为研究对象，分别进行“树高?胸径”和“冠幅?胸径”相关性分析，并通过SPSS软件对调查数据进行回归分析，比较决定系数R2，P值等相关数据后，通过拟合精度检验值（总误差、平均误差、平均相对误差）检验拟合效果，最终从8个预选模型中选出各树种的“树高?胸径”和“冠幅?胸径”最优生长模型。结果表明，10种行道树的“树高?胸径”和“冠幅?胸径”相关性显著，各自的“树高?胸径”和“冠幅?胸径”最优生长模型准确度较高，20个最优模型中，幂函数模型和S模型居多。

Establishment of Optimal Growth Models for 10 Species of Street Trees in Haikou,Hainan

Street trees are an important part of urban garden plants. Study of planting density of the street trees is of great significance to the planning, design, management and maintenance of urban garden plants. Ten species of street trees in Haikou, Hainan were selected to measure their height, crown diameter and DBH, and their correlation between tree height and DBH and between crown diameter and DBH was analyzed. The measurement data were used for regression analysis by SPSS software in eight common growth models. The correlation data such as determination coefficient R2 and P value from the growth models for each tree species were compared, and then the model fitting effect was tested by the fitting accuracy test value (total error, average error, average relative error) to select the optimal growth models for the height and DBH and for the crown diameter and DBH of each tree species from the eight common growth models. The results showed that there was a significant correlation between the tree height and DBH and between the crown diameter and DBH of the 10 species of street trees. The optimal growth models for the tree height and DBH and for the crown diameter-DBH were high in accuracy, and most of them were listed as power function model and S model.