Objective Zhoushan Archipelago has abundant plant resources with the typical island geographical pattern and geomorphic features in Zhejiang Province of eastern China. This study investigated the natural vegetation of the main islands in Zhoushan Archipelago and the local colorful plant resources in the urban green space, built an evaluation model to screen out the suitable plant resources for the colorization green space in Zhoushan Archipelago. This paper summarizes the application status by analyzing the problems of colorful plants in green space of Zhoushan Archipelago, puts forward relevant countermeasures and suggestions, in order to provide a relatively scientific basis for Zhoushan Archipelago plant resources for the construction of ecological civilization with the development and utilization of garden plant resources in Zhoushan Archipelago and even in China.
Method In this study, AHP (analytic hierarchy process) was used to make a relatively objective quantitative evaluation of the local colorful plant resources in Zhoushan Archipelago. From the perspective of landscape architecture and ecology, the evaluation model of four index systems, including aesthetic value, ecological adaptability, cultivation and management characteristics and ecological value (benefit), was established. On the basis of soliciting the opinions and suggestions of relevant professional and technical personnel, according to the climate and environmental characteristics of Zhoushan Archipelago, 18 evaluation indexes of the local colorful plants were determined, and the weight assignment and model evaluation were carried out.
Result On the basis of detailed investigation of urban green space and natural vegetation in Zhoushan Archipelago, according to six principles, 66 local colorful plants with color changes in flowers, leaves, fruits or branches (skins) were screened out, belonging to 38 families and 56 genera. Among them, there were 15 species whose comprehensive evaluation results were class Ⅰ (Tj ≥ 3.5); 24 species of class Ⅱ (3.5 > Tj ≥ 3.0); 27 species of class Ⅲ (Tj < 3.0).
Conclusion Due to the shortage of local land resources in Zhoushan Archipelago, 66 kinds of local colorful plant resources with relatively high comprehensive evaluation can be developed and produced. It is suggested to focus on the development, utilization and popularization of 15 kinds of local colorful plant resources with comprehensive evaluation of class Ⅰ; the 24 kinds of local colorful plants, which are comprehensively evaluated as class Ⅱ, can be developed and utilized as enriching the urban color and plant diversity of Zhoushan Archipelago; the 27 kinds of colorful plant resources, which are comprehensively evaluated as class Ⅲ, can be popularized, developed and utilized in the Yangtze River Delta region, which is rich in land resources in China.