榆林市脆弱生态空间分异特征及脆弱度分析  

Spatial Differentiation Character of Fragile Ecology and Fragility Analysis in Yulin City

作　　者：王宏伟[1] 张鑫[1] 邱俊楠[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨陵712100

出　　处：《水土保持研究》2010年第3期184-188,共5页Research of Soil and Water Conservation

基　　金：国家"863"计划项目(14110209);国家重大科技支撑项目(10712);西北农林科技大学博士科研启动基金资助项目(01140504);科研专项(08080230)

摘　　要：生态环境的脆弱性是自然因素和人为因素共同作用的结果。采用干旱指数、人口集中指数、系统熵等指标与方法,对榆林市的气候、人口、经济以及人均水资源等脆弱因子的空间分异特征进行定量分析研究。结果表明,榆林市的干旱指数由东向西逐渐增大,为半湿润半干旱型气候;人口分布趋于均匀并继续分散;经济发展不平衡,主要集聚在神木县、榆阳区和府谷县;人均水资源西多东少并且整体上逐年减少。基于统计资料,建立评价指标体系,结合主成分分析法和聚类分析法,构建数学模型计算脆弱度并进行等级划分。分析表明,将榆林市生态脆弱性划分为五个等级,脆弱度以榆阳区为中心向四周减弱。The fragility of ecological environment results from natural factor and human factor. The spatial differentiation character of climate,population,per capita water resources and economy are analyzed quantitatively by indicators and methods including drought index,population concentration index,system entropy,etc in Yulin city. The results are as follows：Yulin city whose drought index increases gradually from east to west belongs to semi-humid and semi-arid climate; the distribution of population tends to be uniform and decentralizes continually; the economy develops unevenly and mostly concentrates in the Shenmu county,Yuyang region and Fugu county; per capita water resources is more in the west than in the east and decreases every year as a whole. Based on statistical data,this paper calculates and assorts the fragility through combination between principal component analysis and cluster analysis and mathematical model after the evaluation index system is structured. Analysis indicates that the ecological fragility in Yulin city is divided into five levels and Yuyang region is the center weakened to all around.

关 键 词：空间分异 主成分分析 聚类分析法 脆弱度 

分 类 号：X826[环境科学与工程—环境工程]