抚仙湖流域土地生态安全评价与优化

Assessment and Optimization of Land Ecological Security in the Fuxian Lake Basin

采用PSR模型构建抚仙湖流域土地生态安全评价指标体系,结合综合指数法计算区域土地生态安全指数,利用耦合协调度模型探讨压力、状态、响应系统间的耦合协调程度.结果表明:抚仙湖流域土地生态安全综合指数整体偏低且各乡镇间差异明显,流域北部建城区及南部农业生产区生态安全差,东部山区生态安全较好,西部旅游开发区生态安全呈现稳中向坏的特征,生态不安全重心有南移和西扩的趋势;不同子系统表现出不同的特征,经济发展加速和持续的生态环境治理使流域响应安全指数呈增长趋势;土地压力安全指数整体较高,且各年变化不大,状态安全指数东西高、南北低,安全响应指数呈现出区域分化和圈层特征;压力、状态、响应系统间的耦合度虽然较高,但协调性不足.

An index system for evaluating the ecological security of the land in the Fuxian lake basin was constructed with PSR model.The regional land ecological security index was calculated with comprehensive index method and the degree of coupling coordination among pressure system,state system and response system was explored with coupling coordination degree model.The results show that:(1)the comprehensive index of land ecological security in the Fuxian Lake basin is low and the differences among townships are obvious.The ecological security in the built-up areas of towns in the north and the agricultural production areas in the south of the basin is poor.The ecological security in the eastern mountain areas is better.The ecological security in the western tourism development zones is stable,moderate and deteriorating.The focus of ecological insecurity tends to move southward and expand westward.(2)Different subsystems show different characteristics.The response security index shows a trend of growth because of the development of economy and continuous ecological improvement.The pressure safety index is higher and has little change each year.The state safety index is higher in the East and west,lower in the North and south.The safety response index shows a regional differentiation and circle characteristics.(3)The coupling degree between pressure system,state system and response system is high,but the coordination is insufficient.