Spatial-temporal characteristics of ecological sensitivity in Guangdong-Hong Kong-Macao Greater Bay area

The evaluation and analysis of ecological sensitivity is an important method to study the potential problems of regional ecology, and plays an important role in regional ecological planning and management of the region. In this paper, the study area was divided into extreme sensitivity area, high sensitivity area, moderate sensitivity area, mild sensitivity area and non-sensitivity area. Using the GIS and RS technology, 7 sensitive factors were selected from three aspects: natural ecology, urban expansion and ecological service, and relevant grade index system was built according to sensitive factors. Finally, the analytic hierarchy process (AHP) and multi factor weighted superposition method are used to obtain the results of comprehensive ecological sensitivity evaluation and analysis in the study area. The results showed that: from 1997 to 2007, the proportion of non-sensitivity area and mild sensitivity area increased by 3.91%, the proportion of moderate sensitive area decreased by 0.57%, the proportion of extreme and high sensitivity area decreased by 3.31%, the overall ecological sensitivity of the region is decreasing; from 2007 to 2017, the proportion of non-sensitivity area and mild sensitivity area increased by 2.38%, the proportion of moderate sensitive area decreased by 3.71%, extreme and high sensitivity area proportion increased by 1.32%, the overall ecological sensitivity was still declining trend. According to the ecological sensitivity characteristics of temporal and spatial variation in recent 20 years in Guangdong-Hong Kong-Macao Greater Bay Area results, further puts forward the ecological management and ecological protection development and management measures, provide scientific basis for the ecological economic coordination and sustainable development of green.