Assessing the regional ecological security:Methodology and a case study for the western Jilin province,China
Ecological security can be investigated in both broad sense and narrow sense.Because of the wide area and regional discrepancy in influencing factors and ecological background,the investigation on regional environment hasnt been done systematically.Assessment on regional security in fragile region is important content of sustainable development.The western Jilin Province is located in the semi-arid agro-pastoral interweaving belt (APIB),within which agriculture and animal husbandry interplay or frequently alternate with each other.Study on the regional ecological security of this region can be the scientific sport for protesting the regional environment and sustainability.This article sets up the Stress-Feedback-Control model according to the interaction between human and environmental system,and assesses the ecological safety degree in the western part of Jilin Province in year 2000,using compound model and Grid method based on GIS and RS.The Ecological Security Index (ESI) was calculated by multilayer synthesis with liner weighting function method,which divides the area into the following four different conditions:absolutely secured,secured,risky and unsecured,regarding the change of environmental key point as the threshold value that varied under the stress of human activity.The results show that most part of the investigated area belongs to the secured condition while the risky and unsecured area distributed in the middle and western part of the investigated area.Furthermore,the condition in the eastern part is better than that of the western part.When talking about the ten counties in the region,absolutely secured condition accounts for a very small percentage.The county that has the widest area of secured condition is Qianan,while the smallest is Daan.Taonan is the county that has the largest area of risky condition,which accounts for 43.08 ％ of the whole county area;while Qianan has the smallest area of risky condition,accounting for 1.56 ％ only.The areas in unsecured condition in Tongyu,Zhenlai and Daan have exceeded 10 ％ and they become the region requiring urgent treatment.The sequence of the regions regarding average security is Qianan,Qianguo,Zhenglai,Songyuan City,Changling,Baicheng City,Fuyu,Taonan,Daan and Tongyu,with the first one the highest and the last one the lowest.In study we also analysis the relationship between ESI and landuse change from 1980 to 2000 in order to find an improving method from landscape.The studying show that decreasing of grassland is most import factor influencing the condition of the western Jilin province.
Regional ecological security Pressure-Feedback-control model multilayer synthesis method the western Jilin province China
Xiaoyan Li Linfu Xue Xikui Wang
College of Earth sciences,Jilin University,Changchun,China,130061
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）