Research On Plant Landscape Diversity Evaluation Of Urban Parks In Hangzhou

This paper studied on the plant community of park green space in Hangzhou, took field survey on 58 samples of plant community and measured the ecological index. The plant diversity, landscape plant diversity, human comfort of plant communities and plant landscape evaluation were discussed, 8 natural communities were selected for comparison. The research results were as follows:(1) Sample survey showed that, there were 44 families, 79 genera and 120 species in park green space of Hangzhou, The species index richness of ground shrub layer were the biggest, and the herb was lowest. The type of arbor-small arbor and shrub-shrub-herb has highest species diversity. Natural communities surrounding park has 49 families, 81 genera and 99species, the species index richness of the herb was the biggest, and the arbor was lowest. Evergreen and deciduous broadleaved forest has highest species diversity. The species index richness of park green space were anywhere near that of natural communities,but had different on species.(2) Based on the collocation structure of evergreen trees and deciduous of plant community, 58 samples were divided into 11 types, for example, evergreen/deciduous arbor +evergreen /deciduous small arbor, evergreen arbor + lawn or deciduous trees + lawn, evergreen arbor + evergreen small arbor, plant landscape presented diversity.(3)Questionnaire survey showed that visitors had paid great attention to evergreen trees and deciduous trees. Generally plant communities in park should firstly meet the ecological effect, and given priority to the arbor and evergreen plant, at the same time pay attention to seasonal variation and plant morphology, properly plant deciduous and modelling plants, and so on.(4) Human comfort of spring, summer and fall negatively correlated with the ratio of spices of evergreen to defoliation and crown closure, opposite in winter, the summer is not obvious. Human comfort had some relationship with community structure types and forest type, but not obvious.(5)Using AHP method to build evaluation system of three levels by visual quality, species composition structure and social service, then in 58 samples, comprehensive evaluation index of community gradeâ… was 5, gradeâ…¡was 29, and gradeâ…¢was 24.