摘要
收集澄江县2000~2015年各类用地的数据,利用"压力-状态-响应"模型建立澄江县生态安全21项指标体系,运用主成分分析方法求取指标权重,通过土地生态安全度计算模型评价分析出2000~2015年的生态安全等级.分析结果表明:澄江县不存在牧草地利用类型,其至2015年土地利用类型增加的分别有耕地、园地、居民点及工矿用地、交通用地,土地利用类型面积减少的有林地、水域和未利用地.从土地生态安全等级变化情况看,澄江县2000~2005年土地生态安全为Ⅰ级(很不安全),2006~2011年为Ⅱ级(不安全),2011~2014年为Ⅲ级(临界安全),2015年为Ⅳ级(较安全),其生态安全状态呈上升趋势,土地生态安全和土地利用结构有所改善.
An ecological security system consisting of 22 indexes was established for Chengjiang County by using the "pressure-state-response" model and its ecological security level between 2000 and 2015 was evaluated through the land ecological safety calculation model and the index weight obtained from principal component analysis.The results based on the data of land uses in Chengjiang County between 2000 and 2015 show that there was no land use type of grassland before2015,and there was an increase in land for cultivation,gardening,resident housing,mining sites and transportation,and reduction in land for forest,water and unused land.The ecological security level indicates a trend on rise and the change shows an improvement in land ecological security and land use structure:at Level I(very unsafe)between 2000 and 2005,level II(unsafe)between 2006 and 2011,level III(critical safe)between 2011 and 2014,and level IV(relatively safe)in2015.
出处
《玉溪师范学院学报》
2017年第12期37-43,共7页
Journal of Yuxi Normal University
基金
云南省应用基础研究计划项目"基于RS与GIS的抚仙湖流域土地利用/覆被变化及其生态安全评价与优化"
项目编号:2015FD090
关键词
土地利用
生态安全评价
PSR模型
主成分分析
land use
ecological safety evaluation
P-S-R model
analysis of principal components
