Study On Ecological Security Early Warning Evaluation Of Maduo County In The Source Region Of The Yellow River

Maduo County of Qinghai provinceis an important source of water conservation in the Yellow River source area.It has an irreplaceable strategic position in safeguarding national ecological security and building ecological civilization.Due to the fragile ecological environment and the interference of strong human activities,the ecological security situation where is extremely severe.Carrying out the research on the ecological security early warning evaluation of Maduo County has important indications for the entire Sanjiangyuan area,which can effectively guide the local ecological environmental protection and governance policy formulation.Firstly,this research basis on the P-S-R model and selects 13 early warning factors from three aspects:pressure,state and response,and constructs the ecological security early warning evaluation index system of Maduo County;using remote sensing geoscience analysis method and GIS spatial analysis method,combining the social economic statistics,meteorological data,traffic data,topographic data,satellite data and various thematic data of every township in Maduo County to establish the spatial database of ecological security early warning and evaluation of Maduo County.Secondly,the paper evaluates the ecological security by the analytic hierarchy process,and determines the warning situation of the ecological security in maduo county.All factors are classified and graded by absolute determination method.relative determination method and expert classification method;the evaluation factors are dimensionless in combination with the standardization method.Then determining the ecological security warning alert of Maduo County.The result shows that by order of the ecological security warning distribution area: moderate area > severe area >slight area > enormous area,the area occupied is 15227.65km2,5441.53km2,2283.29km2,and 1271.69km2,counting for 61.45%,21.96%,11.45%,and 5.13%.Finally,combing systematically the reasons which are environmental factors and human factors for affecting the ecological security alert of Maduo County.Environmental factors mainly refer to the fragile ecological environment caused by high and cold;human factors mainly include overloading and grazing,excavating sand gold,building roads,placing rodent drugs,and excavating cordyceps.The research results of this project can promote the ecological early warning evaluation research of alpine ecological fragile areas.Exploring the ecological security early warning evaluation system under special geographical environment.Forming the ecological security early warning evaluation experience that can be replicated and easily promoted.Providing intellectual support for the pilot project of Sanjiangyuan National Park and the ecological environment management of the Yellow River source area of Sanjiangyuan National Park.