甘肃白龙江流域主要生态风险源危险度综合评价  

Evaluation of the hazard scale for the main ecological risk sources in the Bailong river watershed

作　　者：谢余初[1,2] 齐姗姗[1] 张影[1] 巩杰[1] 陈冠[1] 

机构地区：[1]兰州大学资源环境学院,西部环境教育部重点实验室,兰州730000 [2]广西师范学院北部湾环境演变与资源利用教育部重点实验室,南宁530001

出　　处：《兰州大学学报（自然科学版）》2016年第5期634-638,643,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(41271199);中央高校基本科研业务费专项资金项目(Izujbky-2014-265,1zujbky-2014-117)

摘　　要：以中国典型生态环境过渡带甘肃白龙江流域主要生态风险源为评价对象,在充分考虑多等级多重风险源作用强度的差异性以及风险源发生频率、强度及作用范围等的基础上,构建白龙江流域滑坡、泥石流、地震、土壤侵蚀和干旱等主要生态风险源的危险度评价指标体系,并运用层次分析法和地理信息系统空间分析等方法定量评价白龙江流域单要素及综合生态风险源危险度.结果表明:流域内生态风险源的分布存在明显的空间分异规律,高生态风险源危险区集中分布在舟曲-武都-文县段白龙江两岸及以北区域,低生态风险源危险区域集中在自然保护区、林业发展区等.不同区域的主导生态风险源组成也不尽相同,约60%以上的区域是以滑坡、泥石流和土壤侵蚀为主导的生态风险源,且集中在人类活动相对频繁的土石山区河谷地带.Taking the main ecological risk sources of Bailong river watershed as the evaluation objects, this study established the hazard index system of major ecological risk sources such as earthquake, landslips, debris flow, soil erosion and drought by considering the difference of risk source intensity, incidence and occurrence scope in different types. Anglytic hierarchy process was used to determine the weights of index and GIS tech- nology was applied to analyze the spatial distribution of comprehensive risk sources. The results showed that the spatial variation in the main ecological risk source was obvious. Higher risk source areas were mainly con- centrated in the valleys of Bailong river watershed between Zhouqu, Wudu and Wenxian, while low risk source areas were located in nature reserves and forest districts. In different regions, the main composition of ecologi- cal risk source and the dominant source were different. In 60% of Baliong ricer watershed, the main risk sourc- es were debris flow, soil erosion and landslips, and were concentrated in the region of human activities inten- sively and frequently, located in the ecotone between Loess Plateau areas and mountainous areas.

关 键 词：风险源 危险度 空间分布 白龙江流域 

分 类 号：X171.1[环境科学与工程—环境科学]