摘要
水土流失是一种类型的生态风险,因此将水土流失与生态风险评价相结合,定义水土流失生态风险评价的概念,提出评价的方法和步骤,构建水土流失生态风险评价模型,并以北京市为例进行了应用实践。结果表明,北京市水土流失生态风险等级分布有如下特点:山区高风险区域主要位于怀柔与密云交界处、平谷东北部极少部分区域,面积占0.28%;中度风险区域主要位于房山、怀柔南部、密云西部和平谷东北部,面积占6.50%;剩下大部分区域为轻度风险或较安全,面积占78.48%;城区为安全,面积占14.74%。用典型灾害点对生态风险评价结果进行验证,验证结果表明评价模型的可靠性较高,基本符合实际情况。
Soil erosion is a type of ecological risk. The study combined soil erosion and ecological risk evaluation, defined the ecological risk assessment of soil erosion, put forward the method and steps of evaluation, and established the model of soil erosion and ecological risk assessment, by taking Beijing City as an example. The results showed that ecological risk level distribution of soil erosion in Beijing had the following characteristics. Mountain high risk areas were mainly in junction of Huairou and Miyun, a few areas in northeast of Pinggu, area of 0.28 percent. Moderate risk zones were mainly in Fangshan, south of Huairou, the west of Miyun and northeast of Pinggu, area of 6.50 percent. The left was the mild risk or safety, area of 78.48 percent. Urban district was safety, area of 14.74 percent. With the typical hazards evaluation on ecological risk, results were verified, showing that the evaluation model was reliable and consistent with the actual situation.
出处
《生态科学》
CSCD
北大核心
2014年第6期1100-1105,共6页
Ecological Science
关键词
水土流失
生态风险
指标
分级
soil erosion
ecological risk
index
classification
