[Landscape ecological security assessment of Beijing City based on RS and GIS].

By using RS, GIS, and landscape ecology methods, and based on the landscape structure, function, vitality, ecological sensitivity, and landscape pressure, an evaluation index system of landscape ecological security was constructed to analyze the landscape ecological security level and its spatiotemporal distribution pattern in Beijing City in 1988-2004. During the study period, the ecological service value of Beijing City was on a relatively high level, while the landscape vigor index and landscape pressure were on a relatively low level. The stability of landscape structure dropped, and the ecological sensitivity was also on a relatively low level. In 1998 and 2004, the landscape ecological security index of Beijing City was on a medium level, with the average value being 0.410 and 0.403, respectively, suggesting a slight deterioration in the landscape ecological security during the study period.