关键词: 生态风险评价, 漓江流域, 土地利用, 空间分异

Abstract: This paper,based on land use,and taking sub-basin of Lijiang river asevolution unit,uses an integrated regional ecological risk assessment model which contain multiple risk source,multiple receptors and multiple risk effect toevaluate the ecological risk of Lijiang river basin.The results showed that:1)high-risk areas are mainly distributed along Lijiang river around central Guilincity,where there is a concentration of population and industries.The strengthof risksources and the exposure degree of risk receptor,as well as the risk effect ofthese 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 thereare high vegetation coverage and surface water ratio with little human impact.In these regions,the land resources should be reasonablly and effectivelyused,and the ecological environment protection should be reinforced.3) Generalecologicalrisk 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.

Key words: ecological risk assessment, Lijiang river basin, landuse, spatial differentiation