The Ecological Security Assessment Of Qinghai Lake Basin By RS Technology

Based on the study of ecological environment quality, according to theecosystem service function for the human as well as the protection of human societyeconomy and agriculture sustainable development and certain standards, assesses theecological security condition of the ecological environment factors and the wholeecosystem, it is the ecological security assessment.In this study, sets the Qinghai Lake basin ecological environment system as theresearch object, analyses the ecological environment problems, establishes evaluationindex system, assesses the basin ecological security, according to the evaluationresults, provides decision-making basis for the maintenance of the ecologicalenvironment security. This research mainly includes the following sections:(1) Analyzed the ecological environment problems and reasons, selected15evaluation indexes from natural resources, economic and the environment, based onthe “P-S-R" framework model, established the Qinghai Lake basin ecological securityevaluation index system.(2) Take advantage of the technology of RS, extracted land use, vegetationcoverage, soil erosion intensity factor information, Application of GIS technology andcombined with the meteorological data, terrain data and social statistics to obtainother ecological safety evaluation factor information.(3) Application of range standardization and expert points method todimensionless processing the index factors, using AHP method to calculate the weightof each index, use the comprehensive index assessment model calculate the QinghaiLake basin ecological safety comprehensive index.(4) Classified the calculation results by the histogram segmentation method,From the single factor ecological safety index, based on grid of ecological securityindex,based on administrative areas and the ecological security index,analyzes theQinghai lake basin ecological condition in2010. The results show: the ecologicalsecurity of Qinghai Lake basin belongs to the alert level. According to some of early warning and unsafe township of ecological safety condition of Qinghai Lake basin,analyzes the main factors that influence, putting forward the ecological managementmeasures.