| CBD (Central Business District) is the modern cities which is the main business office tertiaryindustry gathering area, which has already been urban hub of economic activity, the basic depending ofurban economic growth and the symbol of urban prosperity. The faction and statue of CBD make it abeautiful landscape of a modern city. Recreational plant landscape carries CBD to improve theecosystem, ornamental leisure, disaster prevention and other functions, and it should become the core ofits beautiful landscape construction goals. This article takes Qianjiang New City CBD in Hangzhou asthe study object, and conducts research on how to build a plant landscape to make recreation function tomaximize the effectiveness of play.30enterable typical samples of Qianjiang New City CBD areinvestigated through the analysis of ecological characteristics,spatial characteristics, recreation behaviorand building PPC model. On basis of the above, optimization strategies of plant landscape are proposed.The results showed that:(1) The existing seed plant has70families114genera155species (including species followinglevels) in CBD of Qianjiang New City. The species richness and species diversity index are in thegeneral level, but which can basically meet the need of recreational plant landscape construction.91kinds of native plants were involved, accounting for58.71%of the total species investigation. Althoughthe range of application is relatively less, the application number is more. Evergreen and deciduousspecies is about4:3, the seasonal landscape is rich. The vertical space is given priority to with "treer+bush+grass", and the sample areas of crown density between0.6and1.0account for73.33%, whichcan provide enough forests recreation space for visitors.(2) The recreational plant space in Hangzhou CBD shows five types and6kinds of combinations,including open space, half-open space, closed space, covering space, vertical space, mouth type, U type,L type, parallel lines type, fuzzy type, focus type. The Tourists’ overall perception of CBD recreationalplant landscape is quite high. The recreational open space types are the most, with an average of4.5.The highest rate by half open space is0.03/m2.(3) The article applied the PPC model based on particle swarm optimization algorithm to buildevaluation system to evaluate the recreation of plant landscape of Qianjiang New City CBD. It is concluded that spatial heterogeneity, plant space boundary, space utilization, community stability,activity type diversity, spatial accessibility of the six indexes weight of plant landscape recreationdegree of impact have the more important influence. According to different types of samples, theaverage of recreation degree is calculated. Half-open space of5kinds of plant space is the highest, for1.60, followed by closed space of1.51, open space of1.41, vertical space of1.32, covering space of1.09.(4) According to the evaluation result, the influence degree of plant landscape recreation factorfrom big to small is respectively recreation suitability, visual beauty, ecological environment quality,and show that activities requirement is more important than landscape visual and ecological effects atthe plant landscape recreation space activities. Consequently, Whether open space, half-open space orclosed space, covering space, vertical space, plant spatial structure is optimized from the landscapeecological characteristics, spatial characteristics, functional requirements to meet the needs of differentgeographical locations, landscape spaces and recreational projects. |
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