摘要
本文以漓江各子流域作为基本评价单元,在土地利用的基础上,利用构建的多风险源、多受体、多风险效应因子的区域综合生态风险评价模型对漓江流域进行土地利用生态风险评价,结果表明:①高生态风险区主要集中分布在人口密集、工业集中的桂林市主城区周边的各子流域,这些流域内的风险源强,受体暴露度和生态风险效应的值均比较高,区域人类活动是区域生态风险加剧和蔓延的主要影响因素;②低生态风险区主要集中在流域上游溶江周边,这些子流域内的植被覆盖度和水面率都比较高,而人类活动干扰相对较弱,应加强土地资源的合理有效利用和生态环境保护,在防止生态环境进一步恶化的同时有效改善当前环境状况;③生态风险总体水平较低,其中较低生态风险区占44.09%,流域总体可降低生态风险潜力很大。
This paper,based on land use,and taking sub-basin of Lijiang river as evolution unit,uses an integrated regional ecological risk assessment model which contain multiple risk source ,multiple receptors and multiple risk effect to evaluate the ecological risk of Lijiang river basin. The results showed that.l） high-risk areas are mainly distributed along Lijiang river around central Guilin city,where there is a concentration of population and industries. The strength of risk sources and the exposure degree of risk receptor,as well as the risk effect of these sub-basins are all in a highvalue. Human activities are the main causes affecting the ecological risk increasing and diffusion. 2） Low risk areas are those sub-basins around Rongjiang river in the upstream where there are high vegetation coverage and surface water ratio with little human impact. In these regions,the land resources should be reasonablly and effectively used, and the ecological environment protection should be reinforced. 3） General ecological risk of the area is low and the proportion of sub-basin with lower ecological risk is up to 44.09%,which suggests the potentiality of reducing ecological risk in the studied area is great.
出处
《广西师范大学学报（自然科学版）》
CAS
北大核心
2012年第4期172-178,共7页
Journal of Guangxi Normal University:Natural Science Edition
基金
国家自然科学基金资助项目(40971280
30870345)
中央分成水资源费资助项目(2010-2011)
关键词
生态风险评价
漓江流域
土地利用
空间分异
ecological risk assessment
Lijiang river basin
land use
spatial differentiation
