Abstract: Aiming at the ecological problems such as soil erosion, desertification, and sal inization in the Jingnanxia-Heishanxia reach of Yellow River, the single-facto rial ecological problem’s sensitivity and the comprehensive ecological s ensitivity of the reach were analyzed by GIS spatial analysis, grid computing an d superposition, and RS image feature extraction. The results showed that the re gions with medium- and high ecological sensitivities almost covered the whole s tudy area, including the Wufo Town of Jingtai County, the Beiwan Town, Wulan Tow n, Mitan Town, Dongwan Town, and Santan Town of Jingyuan County, and the area be tween Doucheng and Hongliutan of Pingchuan District. The high, medium, and low s ensitive areas should be accordingly programmed as forbidden, medium, and deep c onstructing areas. During the development process of regional hydropower, effect ive measures should be adopted to protect the ecological environment to achieve the sustainable development of the drainage area.

Key words: hotspot analysis, abundance, spatial-temporal pattern, Antarctic krill