Abstract:

Bashang area in Hebei Province is the core area of the "two-district" construction for the capital city Beijing,its establishment and optimization of ecological security pattern is of great significance for sustainable ecological development in local area and region of Beijing,Tianjin and Hebei.Ecological sources were extracted from habitat quality index calculated by InVEST model based on the land use data of 2018.The minimum cumulative resistance model was selected to build the minimum cumulative resistance surface.This paper divided ecological security zones into different levels,extracted ecological corridors,and developed ecological security pattern of Hebei Bashang area.The results showed that(1) The habitat quality in Bashang area was generally low,with over 50% of the area at a low level and 46% at medium and high level,presenting the characteristics of polarization of habitat quality,and imbalance in type and distribution,etc.;(2) The ecological source area accounted for 17.50% of the total area of Bashang,and more than 40% of the ecological source area was distributed in Weichang Manchu and Mongolian Autonomous County;(3) The total length of the ecological corridor was 640.86km,and there were 53 ecological nodes.The ecological security zones of high quality in Bashang area accounted for 25.92%,and the ecological security zones of low quality were mainly distributed in Zhangbei County and Kangbao County.The quality of ecological security in Bashang was not very high,the diversity of ecological system was low,the distribution of ecological resources was not balanced in space,and the difference of ecological quality between counties and districts was obvious.In the future,the ecological quality of low-grade ecological regions should be further improved,and a more stable ecological security pattern should be established.

Key words: Bashang plateau ecological protection zone, ecological source area, ecological security pattern, habitat quality, ecological corridor