基于主成分分析的土地生态安全评价实证研究--以陕西省10个省辖市为例

依据P-S-R模型,从土地自然资源现状、土地社会经济环境压力和人文影响3方面出发,选取与土地资源利用密切相关的25个因子构建指标体系,运用主成分分析法对陕西省西安市、铜川市、宝鸡市、咸阳市、渭南市、延安市、汉中市、榆林市、安康市、商洛市等10个省辖市的土地生态安全进行了定量研究.结果表明,延安市和榆林市的土地生态安全处于良好状态;汉中、安康和商洛市的土地生态安全处于预警状态;铜川市和宝鸡市的土地生态安全处于中警状态;西安、咸阳和渭南市的土地生态安全处于重警状态.针对各省辖市的土地生态安全状态特征,提出相应的对策和建议.

Land Ecological Security Evaluation Based on Principal Component Analysis-Take Examples of 10 Provincial Cities in Shaanxi Province

The P-S-R model is used for building index system consist of the 25 factors, which are from three areas: the status quo of natural resources for the land, the socia-leconomica-lenvironmental pressure of the land and the human impact, are closely related to the use of land reso urces. It. s made by the principal component analysis that the quantitative researches on the land ecological security of Xi.an, To ngchuan, Baoji,Xianyang, Weinan, Yan.an,Hanzhong,Yulin,Ankang,Shangluo City etc. in Shaanxi Province. The analytic results showed that Yan. an and Yulin are good condition of the land ecological security; Hanzhong, Ankang and Shangluo are warning state of land ecological security; Tongchuan and Baoji are the medium warning state of the land ecological security; Xi.an, Xianyang and Weinan are serious warning state of the land ecological security. For the characteristics of the land ecological security status of the provincial cities,the corresponding countermeasures and suggestions are proposed.