Research And Establishment Of Ecological Stress Evaluation System For Human Activities In Longmenshan Area

The Ms8.0 magnitude earthquake occurred in the Longmen Mountain area of Sichuan Province on May 12,2008 has attracted wide attention of scholars both at home and abroad.After the earthquake,the natural environment in the Longmen Mountain area has destroyed,and brought about a series of environmental problems.The ecological environment problems as human unreasonable behavior has been a serious threat to water,soil,the atmosphere and other resources,the environmental problems caused by the earthquake and post-disaster reconstruction have caused serious threat and damage to the living environment,ecosystem and biodiversity of the disaster areas,thus posing a great threat to the regional environmental security.This paper takes the longmen mountain areas as the research object,and takes the ecological stress of human activity in longmen mountain areas as the research content,under the background of remote sensing survey and assessment of the national ecological environment(2000-2010).From four aspects:the intensity of social and economic activities,intensity of development,construction activities,and intensity of agricultural activities to build index system of human activity ecological stress of the longmen mountain areas.The paper has constructed the ecological stress and evaluation system of Longmen mountain area by using the theory and evaluation of geographic information system technology,computer technology and ecological stress combined with the object-oriented programming language,embedded component technology and database technology.Using principal component analysis to determine the comprehensive index,with GIS strong spatial analysis ability,according to ARCGIS geometric interval classification and regional actual situation to determine the comprehensive index classification criteria,and calculated the Longmen mountain area human activities comprehensive evaluation index to achieve the human activities ecological stress comprehensive evaluation zoning map of Longmen mountain area.The main conclusions as follows:In the study area,the ecological stress and evaluation system of human activities is constructed the index system with four aspects of intensity of social and economic activities,strength of development activities,intensity of agricultural activities and intensity of pollutant discharge.The system is realized by GIS secondary development technology,and combined the principal component analysis method and ArcGIS spatial analysis method to abtain the comprehensive evaluation of the ecological stress of human activities and the distribution of the score map in study area.The system of human activities stress in Longmen mountain area adopts C/S mode,takes the Microsoft Visual Studio 2010 as the development platform.C~#is the programming language,using ArcGIS Engine 10.2 component GIS development tool,useing SQL server 2008 to organize attribute database,using ArcGIS Engine 10.2library extension function.From the database design and management module,user management module,GIS basic function module,attribute information query module,thematic map query module,ecological stress index evaluation module and other aspects to achieve the system design and function achieve.From 2000 to 2015,the human activities stress in Longmen mountain area was decreasing.The maximum impact of human activities stress highest in Shifang in 2000,2005,2010 and 2015,with the highest stress index of 1.92 in 2000;followed by Chongzhou is 1.47 in 2000;the smallest combination affected of human stress area distributed in Longmen mountain western region such as:Maoxian,Baoxing,Wenchuan and Pingwu etc.From 2000 to 2015,the ranking of index in the Longmen mountain area from high to low as a whole were:Shifang,Chongzhou,Pengzhou,Mianzhu,namely,the country of the east of Longmen mountain,followed by Mianxian,Guangyuan,Ya'an;Ningqiang County,Lushan and Hanyuan relatively small;Qingchuan to the days of the whole area of the smallest HPI.The results of ArcGIS clustering analysis show that the comprehensive stress index of human activities stress in Longmen mountain area is relatively stable in 2000to 2010.The high value gathering area is mainly located in the city of Mianzhu,Shifang Pengzhou,Dujiangyan and Chongzhou,other cities in the local clustering analysis is not significantly related;2010-2015 high value of the gathering area is mainly located in the city of Mianzhu,Shifang,Pengzhou,other cities in the local clustering analysis is not significantly related.The results show that the center of gravity is the same as that of Shifang.The radius range is basically the same as that of Shifang,Pengzhou and Chongzhou.The Longmen mountain human activities ecological stress evaluation system realized the Longmenshan area ecological stress index data management,it can be combined with the study area of human activity factors for its spatial analysis,and obtained the HPI in Longmen mountain area and its score diagram according to the analysis results.The system will help to realize the county government to achieve information management,and provide the basis for the government's scientific management and decision-making.