摘要
基于ALOS遥感影像,采用10m×10m的栅格精度,以乡镇行政区划作为综合评价单元,在G IS的支持下,获取了18种评价因子信息。通过建立生态安全指数模型,计算出每个栅格和每个乡镇区域的生态安全指数并将其划分为6个等级,即Ⅰ级到Ⅵ级(生态安全状况由非常安全到极不安全)。结果表明,新丰江流域内的生态安全状况整体上较好,但安全等级分布不平衡,具有明显的区域性特征,生态堪忧地区为居民及工矿用地密集区,主要分布在流域的北部、东南部和中部的采矿区,如上坪镇、元善镇和上莞镇等;生态较为安全的区域主要分布在流域中部,如新丰江库区附近的锡场镇、半江镇等。该方法为流域的生态安全评价、预警、保护及管理提供了有效手段,具有积极的实用价值。
In this paper,a method of ecological security evaluation in Xinfengjiang River Valley was studied,and a theoretic framework was set up with RS and GIS technology.Based on ALOS image,10m？？0m grid was taken as basic unit,while township as comprehensive unit.Then Pressure-State-Response（PSR） framework was improved and GIS was used to acquire 18 evaluation factors information,such as settlement pressure,road pressure,mining pressure,water quality,vegetative cover index,rivers density index,land deterioration index and so on.Ecological security index was calculated next by different models in every grid and every town in order to make ecological security classification maps.According to the study,ecological security index is divided into six levels.level？？？ns very safe,and level ？？ans very unsafe.From level？？？level ？？e ecosystem services become less and less perfect,the ecosystem structure become less and less complete,and the capacity of ecological restoration and reconstruction reduce gradually,while the destruction degree of ecological environment and the possibility of ecological disaster increase gradually.The results show that（1） Ecological security in Xinfengjiang River Valley is good from global aspect.It accurately reflects the status of ecological security in Xinfengjiang River Valley.（2） Security level distribution in was not balanced,which has evident regional characteristics.The worried status of ecological security were in residential？？industrial and mining area,while states of Xinfengjiang reservoir area were better.（3） 82.43% of this area is in safe,while about 17.57% of the area is in warning.Despite the overall relatively good situation,insecurity has also reached an area of about 217.600 8km2,which accounted for 3.8% of the watershed area.Of the 41 towns in the river valley,there are 35 towns are safe,5 towns are in warning,with only one town unsafe.The study also shows that RS and GIS technology has positive significance for protecting and improving the ecological security in Xinfengjiang River Valley.
出处
《地球信息科学学报》
CSCD
北大核心
2010年第2期301-308,共8页
Journal of Geo-information Science
基金
广东省自然科学基金项目(602030)
广东省现代信息服务业发展专项资金扶持项目(2009316)
关键词
生态安全评价
生态安全指数
RS
GIS
新丰江流域
ecological security evaluation ecological security index RS GIS Xinfengjiang River Valley
