典型喀斯特峰丛洼地土地利用生态风险评价——以平塘县为例  

Ecological Risk Assessment of Land Use in Typical Karst Peak Cluster and Depression——A Case Study of Pingtang County

作　　者：易武英[1] 周文龙[1] 苏维词[1,2] 代丽华[1] 

机构地区：[1]贵州科学院贵州省山地资源研究所,贵阳550001 [2]重庆师范大学地理与旅游学院,重庆400047

出　　处：《湖北农业科学》2017年第4期797-800,共4页Hubei Agricultural Sciences

基　　金：贵州省科技计划课题项目(黔科合SY字[2015]3018);贵州省科技计划项目(黔科合基础[2016]1528-3号);贵州科学院青年基金项目[黔科院J合字[2014]08号]

摘　　要：以喀斯特峰丛洼地发育典型黔南平塘县为研究对象,以2000、2005、2013年三期TM遥感影像为基础数据源,基于"3S"技术手段,结合景观生态学理论,利用土地利用程度指数、耕地垦殖指数、植被覆盖指数、景观多样性指数、景观优势度指数等指标,构建土地利用生态风险评价指标体系,运用改进的TOPSIS模型与变异系数法相结合的方法 ,计算土地利用生态风险综合指数,对研究区不同研究时期土地利用风险进行综合评价。结果表明,研究期间平塘县土地利用生态风险呈增大的变化趋势,土地利用生态风险综合指标从2000年的24.819上升到2013年75.181,主要由于平塘县生态本底极其脆弱敏感,随着人口增长、社会经济发展,大规模不合理的土地开发利用活动给当地造成了极大的生态风险隐患。Taking Pingtang county in typical karst peak and depression as the research object, with Landsat TM of three pe- riods（2000, 2005, 2013） as basic data source, based on ＂3S＂ technology, and combined with theory of landscape ecology, the evaluation index system for ecological risk assessment of land use was established with land use degree index, land recla- mation index, vegetation cover index, landscape diversity index, landscape dominance index and other indexes. Applying the improved Topsis model and combined with variation coefficient method, the ecological risk comprehensive index of land use was estimated to synthetically evaluate the ecological risk of land use at different research period in study area. The results showed that, the ecological risk of land use in Pingtang county indicated the increased change tendency during the study pe- riod, and the ecological risk comprehensive index of land use increased from 24.819 to 75.181 from 2000 to 2013. Mainly because of fragility and sensitivity of ecological background in Pingtang county, and with population growth, the large scale and unreasonable exploitation and utilization of land resulted in huge ecological potential risks to the area.

关 键 词：土地利用生态风险 改进TOPSIS模型 喀斯特峰丛洼地 平塘县 

分 类 号：P964[天文地球—自然地理学]