| The research on plant species composition and landscape optimization of urban green space plays an important role in eco-city greening,biodiversity balance and urban sustainable development.The research has become an important way to study the diversity of urban green space.The present situation of plant resources of urban green space in Dexing city was investigated in this study,and the plant diversity,geographical floristic composition and quantitative characteristics of community in urban green space of Dexing city were analyzed from the view of landscape ecology.The plant landscape of Dexing city was evaluated based on AHP method and SBE method.The main research contents are as follows:The composition of plant species,families,genus diversity and life forms of urban green space in Dexing city were identified and analyzed statistically.The results show that there were 251 species of plants belonging to 202 genus of 94 families in Dexing city.Among them,7 families,8 genus and 8 species of ferns,8 families,14 genus and 19 species of gymnosperms,80 families,180 genus and 224 species of angiosperms.There are 34 species of monocotyledon,belonging to 11 families,30 genus,190 species of dicotyledonous plants,belonging to 69 families and 150 genus in urban green space of Dexing city.As far as the family composition is concerned,the family containing 1specie is the main family,and the genus containing 1 specie is the main component of the urban green space plants.The genera of 2-4 species are the second.There are 26 species of fruit plants,81 species of flower plants,126 species of leaf plants and 18 species of ornamental plants in urban green space,mainly flower-viewing plants and leaf-viewing plants,in terms of ornamental characteristics of the plants,there are 26 species of fruit plants,81 species of flower plants,126 species of leaf-viewing plants and18 species of view-type plants.The distribution of artificially cultivated community plants of Dexing City is diverse in type and complicated in geographical composition.The families of tropical elements form the main part of the family of plants in Dexing City.The distribution of the genera of plants is also dominated by tropical and temperate elements,both of which are prominent in the geographical flora.According to the characteristics and functions of urban land use in Dexing city,the green space was divided into different types of green land by typical sampling method.111 typical plant landscape plots were selected from Dexing city,and a total of 111 typical plant landscape plots were selected from Dexing city.The plant landscape density,quantitative characteristics and plant diversity were measured by the method oflandscape ecology.AHP analytic hierarchy process(AHP)was used to establish an evaluation model consisting of four fields: visual,ecological,service and cultural quality with 5 quantitative indexes and 11 qualitative indexes,and the comprehensive evaluation of plant landscape in 58 sample plots was carried out.According to the score of each evaluation index analyzed and studied,the results indicated that there were 22 plant landscapes in grade Ⅰ,35 in grade Ⅱ and 1 in grade Ⅲ.Take advantage of the beauty of SBE,The SBE value of 58 plant landscape photographs was calculated by degree evaluation method,and the quality order of plant landscape was obtained.The results showed that there were 31 positive and 27 negative SBE values in the plant landscape of 58 sample plots,which indicated that the space of plant landscape development in urban green space of Dexing city was larger than that of urban green space in Dexing city.AHP analytic hierarchy process(AHP)was used to establish an evaluation model consisting of four fields: visual,ecological,service and cultural quality with 5 quantitative indexes and 11 qualitative indexes,and the comprehensive evaluation of plant landscape in 58 sample plots was carried out.Based on the score of each evaluation index analyzed and studied,the result indicates there were 22 plant landscapes in class Ⅰ,35 in grade Ⅱ and 1 in grade Ⅲ.According to the above data,the overall level of plant landscape is not high,but in environmental protection,the intensity of greening is great,so the majority of plant landscape is at the level of grade I and grade II.The SBE beauty degree evaluation method was used to calculate the SBE value of58 plant landscape photos in the sample plots,and the quality order of the plant landscape in the sample plots was obtained.The results showed that there were 31 positive and 27 negative SBE values in the plant landscape of 58 sample plots,which indicated that the space of plant landscape development in urban green space of Dexing city was large enough.On the basis of the research and landscape evaluation,the characteristics of the landscape plants are analyzed.The variety of the native plants is not so abundant and the aquatic plants are scarce,with serious damage of the plants and little efforts of preserving landscape.Therefore,the suggestions for optimizing landscape are put forward,finally,the plant sample with a poor evaluation are selected and optimized. |
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