Abstract: Due to the coupling interaction of rapid urbanization and ecological civilization construction, the ecology and environment of karst cities are becoming more and more fragile and vulnerable, with consequences on ecological security and landscape sustainability. Taking Guiyang, a typical city with karst landscape in Guizhou Province, as an example, we applied Morphological Spatial Pattern Analysis (MSPA) method to identify ecological sources, used the minimum cumulative resistance model to evaluate the landscape connectivity of Guiyang in 2008, 2013, and 2017, and analyzed the temporalspatial change features of landscape connectivity. The results showed that from 2008 to 2017, the landscape types of Guiyang were characterized by enhancement of area of forests, construction lands and unused lands, but reduction in the area of cultivated lands. Within the study period, the core area of Guiyang landscape pattern continued to increase, the landscape connectivity increased slightly, the isolated island area increased significantly, and the degree of landscape fragmentation was serious. The overall connectivity of Guiyang landscape was good, with more than 74% of the study area being middle or high connectivity. Within the 10 years from 2008 to 2017, the level of landscape connectivity in Guiyang showed a trend of weakening first and then strengthening in the central city, and gradually strengthening in the surrounding area. The length and the number of landscape ecological corridors in Guiyang first decreased but then increased. Our results can provide reference to further optimizing the spatial pattern of karst mountain cities and constructing ecological security network.

Key words: landscape connectivity, resistance surface, minimum cumulative resistance model, Morphological Spatial Pattern Analysis (MSPA), Guiyang City.