| The green space in city belong to typical artificial vegetation, the practices of ecological niche related theory has important guiding significance in the city green space construction. The configuration of road green plant should fully consider the impact of plant growth momentum from ecological niche characteristics and factors, rationally allocate species of plants, simulation Reasonable structure, functioning, relatively stable populations naturally stratified community structure. This article is based on green space reality environment of Xiangfu Road in Changsha, researching green plant road landscape from reality niche perspective, measuring ecological factors related parameters through the investigation of plant species, community structure and function, status analysis of landscape plants, then making reference by combining with garden aesthetics, quantitative, qualitative improvement of the road to the green plant status.1. In each segment of road survey, pants were involved a total of 33 plant families,41 genera and 46 species. Include 19 kinds of Arbor,23 kinds of Shrub and 4 kinds of Herb. They accounted for 41.30%,50% and 8.70% of the total.2. In each study of road greenbelt, there are 4 kinds of Arbor using frequency more than 20% which are Cedar, laurel, crape myrtle and cycads.9 kinds of Shrub have more 20% application frequency, Loropetalum chinense var and lobular privet even up to 80%. Based in descending order, they are Azaleas, hibiscus, Photinia, shells holly, Pittosporum, Fatsia and Euonymus. But Magnolia, ginkgo, Elaeocarpus sylvestris, the understory lobular Gardenia,Buxus bodinieri and other plants have less than 10% usage.3. For this study, there are different functional plant communities corresponding Xiangfu East Road, Xiangfu mid Road and Xiangfu West Road.20 Data acquisition quadrats. Picking climatic factors and soil factors as measurement object which include temperature, humidity, wind speed, air CO2 content, light intensity and soil salt content. They include,(1)Temperature measurement shown the four green spaces decreasing order are middle driving separate greenbelt, sides driving separate greenbelt, roadsides greenbelt and traffic island greenbelt. Middle driving separate greenbelt has the most obvious cooling effect but traffic island worst. For same type of road greenbelt, the cooling effect depends on Hierarchical structure of plant communities. Richer hierarchy has more obvious effect.(2)Humidity measurement shown that both air humidity inside the plant community and bare surface humidity changes significantly. From single sample, bare surface moisture and humidity is generally lower than in the plant community.(3)Anemometry shown plant community can help to block the wind base on lower wind speed in these 20 samples. Comprehensive analysis shows larger density has more obvious blocking effect.(4)Determination of CO2 content shown CO2 concentration has variance between Internal and External plant communities.Therefore, the photosynthetic capacity of tall Arbor trees is significantly stronger than Low shrubs and herbaceous.(5)Light intensity measurement shown shading effect of tall Arbor trees is significantly better than low shrubs. Rich plant community has stronger shading effect. Magnolia and Osmanthus tall Arbor trees have stronger shading effect but it was not used widely. Except Xiangfu Mid Road, there are few medium and large Arbor trees in others. They have poor ability to block the sunshine injection since small crown, strong permeability and monotonous level.(6)Soil salt content measurement shown that the content is generally low. Soil salt content is basically in a relatively stable and low value. There is little effect to plant growth.4.Analysis of ecological factors, plant species and community structure optimization suggestions are put forward,including configuration model and related plant selection of Xiangfu Road plant landscape investigation and reconstruction. |
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