关键词: 土地利用, 山地灾害, 敏感性, 小江流域, 长江上游

Abstract: In China, the mountainous upper reaches of Yangtze River Basin is the densely distributed area of maintain hazards, and the most important sediment supply region resulting from their intensive occurrence. For hazards mitigation, sediment control, soil and water conversation in this area, much research has been conducted on the influence of physical factors on the occurrence of mountain hazards, but relatively little attention has been paid to the study of the integrated and quantitative influences of physical and human activities factors, especially the impact of human activities. Currently, as one of the important factors influencing the occurrence of mountain hazards, land use has been recognized as the joint core field of the mutual action of natural process and human activities, and it supplies a new method to study the relations between mountain hazards and their physical and man\|made causes. In this paper, sensitivity coefficient and its quantitative calculative method were introduced on the basis of GIS and RS technologies, and the sensitivity value of different kinds of mountain hazards on land use was systematically calculated through a case of Xiaojiang Basin in the upper reach of the Yangtze River. From this research, the most vulnerable land use types to mountain hazards are built\|up for mining, road and railway construction, dry land at the slope larger than 15 degree, lowcover (5%~20%) grassland and reservoir at the slope larger than 15 degree, urban land, barren land at the slope larger than 8 degree, highcover (>50%) grassland at the slope larger than 35 degree. The insensitive land use are forestland, farmland at the slope lower than 15 degree, brush and sparse wood land and highcover (>50%) grassland at the slope less than 25 degree.

Key words: land use, mountain hazards, sensitivity, Xiaojiang Basin, upper reaches of Yangtze