水土保持研究2017，Vol.24Issue(3)：198-205,8.
基于GIS和几何平均数模型的流域生态安全评估及在各因子中的分异特征——以星云湖流域为例
An Assessment on Basin Ecological Security and Its Variation Characteristics in Factors Based on GIS Technique and Geometric Mean Model——A Case in Nebula Lake Basin
摘要
Abstract
The 10 factors includes elevation,slope,soil erosion intensity,prone to geological disasters,land use types,vegetation coverage,distance from the natural ecological protection zone,the distance of construction land,population density and the distance from the water were selected to evaluate the ecological security of Nebula Lake Basin.The spatial distribution and formation mechanism of regional ecological security was analyzed by using the geometric mean model and 3S technology tentatively.The study showed that the average ecological security index was 2.33 in Nebula Lake basin.From the aspect of area proportion of all security levels,the area of moderate security zone accounted for 42.34％,high security for 22.84％,the low security for 26.43％,the unsafe for 8.39％ of the total basin area,which illustrated that ecological security was mainly moderate security in the basin;from spatial distribution aspect,the zone of higher ecological security mainly distributed in the northern,eastern and southern and built-up zones in Nebula Lake basin where the slope gradients of land are great,terrain was undulated,the forest landscape was fragemental,land use was not reasonable,soil erosion was severe,and geological disasters has happened except that the city building intensive area was disturbed by the human,these regiions are the key areas of ecological protection and construction;there is a big difference between the two results that the regional ecological security is affected by multiple factors,single factor evaluation is difficult to accurately reflect the characteristics and mechanism of spatial differentiation of the regional ecological security through the comparison and analysis between the results of comprehensive evaluation and single factor evaluation.There is the relationship of mutual promotion and inhibition among each factor.The factors such as slope,water resource environment,soil and water loss and disturbance factors of human activities such as land use pattern,distance from construction land are the main factors to form the ecological security pattern of the basin.关键词
几何平均数模型/GIS技术/生态安全格局/空间分异/星云湖流域Key words
geometric mean model/GIS technique/ecological security pattern/spatial differentiation/Xingyun Lake Basin分类
管理科学引用本文复制引用
李益敏,朱军,余艳红..基于GIS和几何平均数模型的流域生态安全评估及在各因子中的分异特征——以星云湖流域为例[J].水土保持研究,2017,24(3):198-205,8.基金项目
云南省高原湖泊流域污染过程与管理重点实验室开放资助项目“高原湖泊流域关键生态用地识别技术及空间优化研究”(KH100992) （KH100992）
