Regional Ecological Security Assessment of the Yellow River Delta Based on Landscape Index and "3S" Techniques

Using the TM remote sensing images and the social and economic statistics data of 1987a, 1997a and 2007a of the Yellow River Delta, established the ecological security assessment index system based on the "Pressure-Stats-Response (P-S-R)" framework and the Analytical Hierarchy Process (AHP) method, and then assessed the ecological security based on the ecological principle and "3S" techniques. The results showed that the land use changes were rapidly in the Yellow River Delta in the past twenty years, and the changes of landscape structures and functions induced the ecological security index decrease directly. The comprehensive assessment showed that the ecological security index of the study area was 0.8401, 0.7918 and 0.6030 in 1987a, 1997a and 2007a respectively, these results also demonstrated that the ecological security of the Yellow River Delta was continuous decreasing during the study period.