基于DPSIR模型的云南省土地生态安全评价

A DPSIR Model Based Assessment of Land Ecological Security in Yunnan Province

以云南省129个县(市、区)为基本单元,2000年、2003年、2006年、2009年、2012年和2015年为研究时段,采用DPSIR模型构建评价体系,以熵权法为各指标赋权,利用综合安全指数模型计算区域土地生态安全综合值。结果表明:在时间变化方面,2000—2015年,土地生态安全综合值整体上逐年提高,其中126个县(市、区)土地生态安全综合值呈上升趋势,主要原因是驱动力和响应2个变量的快速提高;官渡区、西山区和红塔区的降低。综合动态度呈先增后减的变化趋势,表明人类活动对土地生态安全的综合影响强度呈下降趋势。在空间分异方面,2000—2015年,滇东北、滇西北、滇西南和滇东南边界上土地生态安全等级为临界安全(Ⅳ)的区域提高为较安全(Ⅲ)或安全(Ⅱ),滇中大部分区域安全等级由较安全(Ⅲ)向安全(Ⅱ)发展,昆明周边较少的区域向理想安全(Ⅰ)演变。云南省土地生态安全状况整体呈现以昆明为中心,向曲靖、玉溪、红河、楚雄、大理等区域发展。

Taking 129 counties(cities or districts)in Yunnan Province as the study area,based on the statistical data and vector data(2000,2003,2006,2009,2012 and 2015),the evaluation system is constructed by using the improved DPSIR model,and the entropy weight method is used to determine the weight of indexes,and the comprehensive value of regional land ecological security was calculated by the comprehensive security index model.The study results are as follows:Change in time,from 2000 to 2015,the overall value of land ecological security increased year by year.Among them,the comprehensive value of land ecological security in 126 counties(cities,districts)showed an upward trend,the main reason is that the 2 variables of driving force and response increase rapidly,and Guandu District,Xishan District,and Hongta District decreased.The comprehensive dynamic degree increased at first and then decreased,indicating that the comprehensive impact of human activities on land ecological security showed a downward trend.Spatial differences,from 2000 to 2015,the ecological security level of land in Northeast Yunnan,Northwest Yunnan,Southwest Yunnan,and the borders of southeastern Yunnan increased from critical safety(Ⅳ)to safer(Ⅲ)or safe(Ⅱ),most areas of central Yunnan have developed from safer(Ⅲ)to safe(Ⅱ),and the areas around Kunming have evolved to ideal safe(Ⅰ).The overall situation of land ecological security in Yunnan Province is centered on Kunming and developing towards Qujing,Yuxi,Honghe,Chuxiong and Dali.