代表作3基于GIS的我国水蚀区侵蚀危险度抽样调查.docVIP

基于GIS的我国水蚀区侵蚀危险度抽样调查 李智广1，罗志东1，任洪玉2 （1.水利部水土保持监测中心，100053，北京；2.长江水利委员会长江科学院，430010，武汉） 摘 要 在中国水土流失与生态安全综合科学考察中，开展了全国水蚀区水蚀后果危险度抽样调查研究。在6个类型区中，选择26个1:10000地形图图幅大小范围的5个主要指标，在地理信息系统（GIS）支持下，综合评估了不同类型区调查样区的水蚀后果危险度。结果表明：西南石漠化区、北方土石山区处在极险-毁坏型等级区，长江上游及西南诸河流域区属危险型等级区，南方红壤丘陵区属于轻险-危险型等级区，西北黄土高原区和东北黑土区属于轻险型等级区。 关键词 水蚀；危险度；GIS；调查 Sample survey for hazard degree of water erosion region in China based on GIS Li Zhiguang1，Luo Zhidong1，Ren Hongyu2 (1. The center of water and soil monitoring, 100053, Beijing 2. Yangtze river scientific reseach institute,430010,Wuhan：China) Abstract During the integrated scientific investigation of soil erosion and ecological safety in China, the potential hazard degree evaluation of water erosion region was studied. The investigation regions include Black Soil Region in Northeast China, Earthy-Rocky Mountainous Region in North China, Loess Plateau Region of Northwest China, Upper Reaches of Yangtze River and Rivers of Southwest China, Red Soil-Hilly Region in South China and Rocky Desertification Region in southwest China. 26 sample plots corresponding to realistic map of 1:10000 were set. And the indexes of land-use type, slope, vegetation coverage, effective thickness of soil layer, and soil bulk?density were selected. Based on GIS, the final hazard degree of water erosion in different investigation region was synthetically evaluated. The results show that Rocky Desertification Region and Earthy-Rocky Mountainous Region are in Extremely Hazard to Destroying Region, Upper Reaches of Yangtze River and Rivers of Southwest China is in Hazard Region, Red Soil-Hilly Region is in Light Hazard to Hazard Region, and Loess Plateau Region and Black Soil Region are in Light Hazard Region. Key words water erosion; hazard degree; GIS; Sample survey 土壤侵蚀危险程度，；，[1-3]。侵蚀危险度研究对于保护土地资源及土地经营、农业开发、经济建设都具有预防预警的重大意义。随着土壤侵蚀研究的深入及其对农业生产等相关产业可持续发展的支撑作用的进一步加强，土壤侵蚀危险度的研究愈来愈显得重要而迫切。 为了掌握全国土壤侵蚀状况，在2005年开展的“中国水土流失与生态安全综合科学考察”项目中，开展了水蚀区水蚀后果危险度抽样调查研究。按照国家技术标准，开展全国范围水蚀区的侵蚀后