| The Chongqing section of the Three Gorges Area is the ecological sensitive area for its special geographical position,and the natural geographical conditions and geological conditions are special too.Since the completion of the Three Gorges hydropower project,it had a profound impact on the natural ecological environment and social and economic changes in the reservoir area.In order to reveal the Three Gorges ecosystem health status and to realize the sustainable development,it's significant to study the ecosystem health of 22 districts and its visualization.Based on multi-source data from 2005 to 2015,this paper discussed the state and change trend of ecosystem health in the Three Gorges reservoir of Chongqing section from three aspects of social and economic development,ecological landscape and agriculture in the towns of the reservoir area.Combined the normal cloud model,the ecosystem health problem of each district is diagnosed,compare with traditional entropy weight model evaluation method for conclusion and further discussion.And this paper discusses the health status of ecosystem health in Chongqing Three Gorges Reservoir area from 2005 to 2015 by using emergy analysis which was compared with the longitudinal evaluation conclusion of the entropy model,the change trend and law of ecosystem health in Chongqing Three Gorges Reservoir area are obtained.The result shows that:(1)The normal cloud model is good at diagnosing the health status of ecosystem in each district,but while coupling weighted average principle method,the study result is homogenization.The traditional entropy weight evaluation method can reveal the health status of the comprehensive ecological system in each district,but can't get the crux of the specific ecosystem.The evaluation results show the development status of urban and rural dualization in Chongqing section of the Three Gorges Reservoir area.Yuzhong district,Jiangbei district,Yubei district Shapingba district in the evaluation of ecological town economic subsystem,the evaluation level is higher than in the ecological agriculture subsystem.Wanzhou district,Yunyang district,Fengjie district and Jiangjin district's evaluation level is higher than urban districts in ecological agriculture subsystem.Ecological landscape subsystem is mainly analyzed the land use ratio imbalance,and the characteristics of the ecological landscape parameters and soil erosion,Wulong district,Shizhu district and Wuxi district evaluation level is low,which is easily to receive the threat of natural geological disasters.The results of the comprehensive assessment of ecosystem health showed that the ecological system of the Three Gorges Reservoir area of Chongqing section was higher than that in the west,while the central and eastern regions were weak.(2)The application factor analysis and the improved grey prediction method were used to construct a total of 22 indicators of the ecosystem health longitudinal monitoring and diagnosis index system.The forecast results show that the health status of the ecosystem in Jiangjin district and Wanzhou district has obviously increased,while the Yuzhong district,Dadukou district and Beibei district have deteriorated.Wushan,Shizhu and Wuxi evaluation level rise,the ecosystem health status has improved.In Fengdu district,Zhongxian district and Yunyang district,the changes were small,and there were fluctuations in the evaluation level of the open state,and there was no change in the Banan district,Fuling area.Using emergy analysis with eight parameters,it can reveal the ecosystem health status of the research area in 2005~2015.Additionally,this paper combines with normal cloud model to accomplish the systematic assessment.The results reveal that: during 2005~2015,the total emergy value of the research area have increased;The NEYR was the largest in 2005 and declined in each research year.The EMR decreased year by year which indicates a gradual reduction in GDP earned by using local natural resources;The ELR was the largest in the 2006,and it decreased during 2013~2015,and in 2015 it was slightly higher than 2014.The EUEHI increased year by year,and the ESI reached its maximum in 2007.The health status of ecological system in the research area was turning bad before 2013,it has been increased year by year since 2013.The ecosystem health of reservoir area gradually reached dynamic stable.Moreover,the emergy analysis and normal cloud model effectively reduce the accidental error in the assessment process.It realizes the binary fuzziness of the energy value index in different evaluation grades.(3)Coupling Matlab and.net,this application method has been applied to realize the technical process of the combination of the metrological model and the development of geographic.It take the advantage of the easy model building of Matlab and the visualization of the.net.Matlab in the development of the product not only realizes the geographic information system software of data input,editing,storage,processing,output,and other functions,more combined with normal cloud model,as the core of this system is presented. |
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