基于遥感和PSR模型的城市景观生态安全评价——以福建省龙岩市为例

Urban landscape ecological security assessment based on remote sensing and PSR model: A case study in Longyan City,Fujian Province

为了解福建省龙岩市景观生态安全程度及空间分布规律,运用"压力-状态-响应(press-state-response,PSR)"概念模型构建了城市景观生态安全评价体系。结合多时相遥感数据、GIS技术和景观生态学理论,通过空间叠加分析得到2001年和2008年龙岩市景观生态安全综合指数分布图。研究结果表明:2001—2008年间,龙岩市景观所承受的外界压力增加,各类景观结构稳定,景观活力、生态状态处于良好水平;2001年景观生态安全均值为7.27,处于较高安全水平,2008年平均值为6.65,处于中等安全水平。因此,研究时段内龙岩市景观生态安全状况处于好中临降的趋势,建议在今后的城市规划与建设中优化土地利用格局,以提高城市景观生态安全指数值。

In order to explore the degree and spatial distribution of landscape ecological security in Longyan City, the authors constructed the ecological security assessment index system of Longyan City based on the ＂pressure - state- response＂ conceptual model. And the landscape ecological security comprehensive index distribution in 2001 and 2008 was overplayed by means of multi - temporal remote sensing images, GIS techniques and landscape ecological theory. The results showed that, with the increasing of the outside pressures, landscape structure was stable, and landscape vigor and ecological status were both at a good level. The mean value of landscape ecological security index was 7.27 in 2001, which was located at the high level, while in 2008 the index was 6.65, which was at a medium level. Therefore, it is concluded that the landscape ecological security of Longyan City experienced a slight deterioration during the study period. In order to improve the urban landscape ecological security, the authors suggest optimizing the land use pattern in the future urban planning and construction.