甘肃白龙江流域主要生态风险源危险度综合评价

发布时间：2017-12-31 00:38

本文关键词：甘肃白龙江流域主要生态风险源危险度综合评价　出处：《兰州大学学报(自然科学版)》2016年05期 　论文类型：期刊论文

【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.
[Abstract]:The main source of ecological risk to ecological environment Chinese typical ecotone of Gansu Bai Longjiang Valley as evaluation object, considering the difference of multi class multiple risk sources and risk source strength of the frequency, intensity and scope based on the construction of landslide, Bai Longjiang Valley debris flow, earthquake, the main source of soil erosion and ecological risk drought risk assessment index system, and using AHP and GIS spatial analysis method for quantitative evaluation of Longjiang basin and the comprehensive ecological risk source risk factors. The results show that the distribution has obvious spatial distribution of ecological risk sources in the basin, the high ecological risk sources are mainly distributed in the danger zone Zhouqu - Wudu - Wenxian section of white on both sides of Longjiang and north of the regional ecological risk sources, low risk areas concentrated in the nature reserve, forestry development in different regions of the main area. The composition of the ecological risk sources is also different. About 60% of the areas are landslides, debris flows and soil erosion dominated by ecological risk sources, and they are concentrated in the valley area where human activities are relatively frequent.

【作者单位】：兰州大学资源环境学院西部环境教育部重点实验室;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;
【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)
【分类号】：X826
【正文快照】： 随着社会经济的不断发展,流域生态系统和资源环境受到越来越多的外界胁迫,自然灾害频发、人类活动扰动不断增强、资源结构性短缺矛盾逐渐加剧,使得流域成为区域人地关系最为紧张和复杂的地理单元[12].全面认识流域内主要风险源及其危险度,不仅是灾害科学研究的重要内容之一,也

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