摘要
以渭河下游河流沿线区域为研究区,基于风险度量的基本原理和区域生态风险评价的流程框图,构建了综合生态风险值的计算模型,即综合生态风险值是综合风险概率、综合生态损失度和综合社会经济易损度的叠加。在研究区历史资料考证和2002年ETM+遥感影像景观分类的基础上,通过选取干旱、洪水、污染和水土流失,利用地理信息系统和现代地理学中的大量数学方法,按照评价步骤和计算模型,将研究区4种生态风险源综合评价结果划分为低风险区,较低风险区,中等风险区,较高风险区和高风险区5个级别。研究结果为环境管理和生态风险决策提供数量化的理论依据和数据支持。
Taking the catchment area along the Weihe River in Shaanxi Province as a study area,and on the basis of elementary principles of risk and the theoretical framework on regional ecological risk assessment,calculative model was established to obtain integrated ecological risk value which was computed by the integrated risk probability,integrated eco-damage,and integrated socio-economic vulnerability.Based on the historical data in study area and landscape classified image of ETM＋ in 2002,by selecting four risk sources of drought,flood,pollution and soil erosion,using GIS and a variety of mathematical models and methods,according to assessed steps and calculative model,this paper divided general risk assessed results mainly into five grades,that is,the lowest risk region,lower risk region,moderate risk region,higher risk region,and the highest risk regions.The results can provide quantitatively theoretic basis and data support for environmental management and ecological risk decision-making,and it has an important reference value.
出处
《生态学报》
CAS
CSCD
北大核心
2009年第10期5523-5534,共12页
Acta Ecologica Sinica
基金
国家教育部人文社会科学重点研究基地重点资助项目(YRCSD08A05)
陕西省重点实验室基金资助项目(08JZ05)
关键词
地理信息系统
综合生态风险值
区域生态风险评价
渭河下游
GIS
integrated value of ecological risk
regional ecological risk assessment
lower reaches of the Weihe River
