基于变异系数法的北京市山区小流域生态环境质量评价

以北京市山区小流域为研究对象，综合考虑自然环境、生态健康、人类活动等因素的影响，构建了北京市山区小流域系统的生态环境质量评价模型。采用变异系数法，以小流域为评价尺度，对北京市山区的房山、平谷、密云、昌平、怀柔、延庆、门头沟7个区县551条小流域的生态环境质量进行定量评价。结果表明，北京市山区小流域整体生态环境质量良，综合指数6.83，各区县间生态环境质量差异不大，以密云县生态环境质量最优，其余6区县生态环境质量较好。使用变异系数法进行评价的结果与现状基本相符，说明该研究方法具有科学性、可行性，能用于区域生态环境质量研究。

Small Watershed Eco-environmental Quality Appraisal of Beijing Mountain Area Based on Coefficient Variation

Regarding the small watershed of the mountainous region in Beijing as the research object,considering the nature environment,ecology health,human activity and other effects synthetically,an evaluation model of ecological and environmental quality of small watershed system in Beijing mountain region was established.Variation coefficient method with high accuracy and strong objectiveness was adopted to quantitatively evaluate ecological and environmental quality of Being Mountainous region,including 551 small watersheds in seven districts,such as Fangshan,Pinggu,Miyun,Changping,Huairou,Yanqing,and Mentougou.It showed that the ecological environmental quality in Beijing mountainous region geneally was good,with the comprehensive index of 6.83,and the environmental quality variations among districts were small.The ecological environmental quality in Miyun was the best.Those of the rest six districts were within the level of good.The result measured by coefficient of variation method was roughly in line with actual situation,indicating the scientificity and feasibility of the method,which could be used to study regional eco-environmental quality.