| The comprehensive park is an important type of urban parks, whose plant landscape is important carrier of safeguarding populace's demand for the urban public green area and of improving the city ecological environment. The characteristics and disposition of plant community is the basis of plant landscape quality, which with plant landscape quality together determines the quality and ecological service function of the comprehensive park green.In the paper, by taking six typical comprehensive parks located at different position in Chengdu city as the research entity, the floristic composition, the species diversity, the vegetation type and the community structure as the characteristic of community were studied. Based on this, it established the plant community landscape evaluation system with the method of AHP(Analytic Hierarchy Process), and determined evaluation factor and its weight, and quantitatively evaluated plant community landscape. At the same time, it chooses different groups to evaluate the photos of plant communities with the method of SBE(Scenic Beauty Estimation Procedure) would get the value of the scenery aesthetic quality of plant community landscape, and then carried on the relevance and the difference analysis. The results showed that:1. In the 102 plant communities belong to 6 comprehensive parks in Chengdu city investigated, there are 238 species plants belonging to 109 genera in 89 families, the plant families and genera applied are relatively rich, but the species are not many. In the spatial structure of plant community disposition, the vertical structure of community is simple, the quantity of arbor shrub herb type communities are more than other types, so it is lack of multiform. The main types of the plant communities are evergreen deciduous broad-leaf forests and evergreen broad-leaved forest, although it has reflected the characteristic of zonal vegetation, it is not beneficial to the formation of diversified plant landscape.2. Through evaluation and analysis, the results showed that the quality of plant community landscape in comprehensive parks in Chengdu city were lower than the middle level, and the quantity of landscape with high quality is limited, so is the species of most used. The quality of plant community landscape were different among parks, it is with high quality in Cultural Park and Park Xin Hua, medium quality in Park Bai Huatan and Park Huan Huaxi, but low quality in Park Ta Zishan and the Dong Hu Park. Meanwhile, there are common problems those are extensive management in open park and serious artificial destruction in comprehensive parks in Chengdu city, which have a biggish influence on plant landscape.3. On the construction and renewal of plant community landscape in comprehensive parks in Chengdu city, it could use species composition and structural characteristics as well as zonal plant community for reference, develope and apply native species vigorously, choose and introduce exotic plant species, to build plant communities with integrity structural, variety of types which similar to the nature forest, therefore enrich the type of plant landscape and improves the quality of plant landscape. Meanwhile, it should take care of the existing plant landscape community in each park. The basic forms of plant landscape of diverse function district in comprehensive parks are discriminatory, which is reflected in the difference of space type build and shape of plant landscape. Through reasonable choice of plant material and disposition pattern as well as reasonable plant expenetration and fusion, it could make the function of plant landscape in function district more perfect.4. The evaluation system was established through AHP, it determined the weights of landscape evaluation factors, then obtained the quality grade of plant landscape. The value of the scenery aesthetic quality of plant community landscape, obtained by the method of SBE, can really reflect the quality of plant community landscape and the consistency as well as difference of different group's preference to plant landscape. The method of AHP evaluates the plant community landscape objectively and quantitatively by using all evaluation indices studied out by experts, while the method of SBE evaluates the photos of plant community landscape by means of subjective feeling of different groups and then obtaines the value of the scenery aesthetic quality of plant community landscape by using mathematical method. Although the foundation and form are different between AHP and SBE, the appreciation results were agreeable, it shows that the two methods of evaluating plant landscape could be used together to evaluate the landscape qualitatively and quantitatively. |
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