关键词: 高原城市湿地, 湿地生态安全, DPSIRM模型, 主成分分析, 灰色关联法

Abstract: As a special ecosystem in plateau cities, urban wetland plays an important role in maintaining socio-economic development and ecological security. The evaluation of wetland ecological safety in plateau cities is the key to comprehensively understand ecological security status of wetland, which would provide scientific basis for protecting wetland and ecological security. With Xining section of Huangshui Basin as an example, we evaluated the ecological security of wetland from 2000 to 2019, through establishing ecological security index system of wetland based on DPSIRM model and the principal component analysis to determine the index weight. Further, the factors influencing wetland ecological security were analyzed using the gray correlation method. The results showed that the ecological security of wetland in Xining section of Huangshui Basin from 2000 to 2019 gradually improved, the comprehensive index of security increased from 0.338 to 0.781, and the level of security increased from unsafe to relatively safe. For the six subsystems, the security level of driving force, state and management had risen to relatively safe level, while pressure, impact and response had increased to safe level. Mean annual precipitation, per capita GDP, per capita water resources, water quality index, proportion of tertiary industry and wetland management level had the highest correlation scores, with the greatest influence on their ecological security. Climate and human activities were the critical factors affecting the ecological security of plateau urban wetland, mainly including mean annual precipitation, urbanization rate, water quality index, the proportion of tertiary industry, population density, the proportion of days with good air quality, per capita water resources, wetland management level, and mean annual temperature.

Key words: plateau urban wetland, wetland ecological security, DPSIRM model, principal component analysis, gray correlation method.