Study On Quantitative Evaluation System Of Plant Landscape In Urban Park

This research is based on the theory of landscape ecology, establishing the quantitative evaluation system by using projection pursuit clustering analysis, and a quantitative study on 12 plots of four urban parks which including Xuanwu Lake Park, Bailu Zhou Park, Xiama Fang Park and Boai Yuan, results are as follows:(1) Urban park plant landscape evaluation system:exploration introducing the calculation methods in landscape ecology landscape diversity into the analysis calculation of plant landscape characteristics. Totally selecting 11 quantitative indicators which include the proportion of color leafed plants (C1), index of leaf color diversity (C2), the proportion of flower ornamentals(C3), index of flower color diversity (C4), the proportion of fruit ornamentals(C5), index of fruit color diversity (C6), the proportion of main texture (C7), index of the texture diversity (C8) seasonal ornamental diversity (C9), the average plaque area (C10) and the index of the landscape plant diversity(C11); analyzing the date of 12 plots by using the projection pursuit method, sorting the importance of indicators according to the best projection direction:C5>C1>C6>C3>C9>C8>C4>C10>C7>C11>C2.(2) Scientific classification of plant texture by trying to use the cluster analysis method: Dividing the plants of the investigation into trees and shrubs to study the texture, taking the ratio of the height of the trees, crown width, leaf length and width, leaf area and the crown area, the ratio of the leaf length and width and the height as the index of the tree texture classification, taking the height of the shrubs, the length and width of leaf, the radio of the length and width of the leaf and the height of the shrubs as the index of the shrubs, classifying the plant texture of the plots. Totally, dividing the trees into 9 types, and dividing the shrubs into 10 types.(3) There were 68 plants in the 12 plots of the survey in this study,33 kinds of the color leaf plant, the red-leaf plant shad 22 kind which were most, and the complex color leaf plants were least which just had 3 kind. There were 42 kinds of flower ornamentals, the application of the white-flower were most which were 18 kinds, there was just one kind of the blue flower ornamentals. There were 41 kind of fruit ornamentals, there were 26 kinds of red-fruit which were the most, there was only one kind of white-fruit which was the least. The layers of the plant landscape texture were rich, after classifying the texture of the plant landscape and analyzing the application, finding that the species of the rough texture were much more than the species of the delicate texture in the plots.(4) Based on the evaluation index system that based on projection pursuit method which had been established, marking the 12 plots in the four parks from 1# to 12#, quantitative analyzing the quality of the merits of the plant landscape, obtaining the merits sorting of the plant landscape as 4#> 8#> 11#> 10#> 2#> 5#> 6#> 7#> 9#> 3#> 12# > 1#, the best plots were the 4# plot in Bailu Zhou Park, the worst plot were the 1# plot in Xuanwu Lake Park.Evaluating the plant landscape by using cluster analysis and projection pursuit method in this study, this method reducing the subjective influence in the evaluation of plant landscape, providing a scientific, objective basis for the optimization of city park landscape.