Remote Sensing Dynamic Diagnosis And Repairability Research Of Alpine Wetland In Zoige County

Alpine wetland is located southeast of the qinghai-tibet plateau is the zoige county,as a representative of the domestic typical alpine wetland ecosystem of the sensitive area of climate change,is a great active regulating climate in sichuan basin natural functional areas.Marsh peat resources abundant,is also a variety of rare wild animals and plants ideal survival and reproduction,ecological service value is extremely high.At present,the integration of the world,especially the accelerating economic integration development speed and the global warming trend obviously,zoig alpine wetland ecological environment are threatened,such as marsh plaque decline,degeneration and atrophy,cattle clutches the lake dried up,disappear,meadow landscape(bog)broken degree deepening,ecosystem function decline.Based on the rational utilization of the wetland environment,the quality and efficiency of the ecological restoration security needs,is very necessary to effectively monitor the wetland evolution,find the scope of the local wetland changes and trends,ascension can repair the evaluation accuracy and objectivity.The author supported by/OLI Landsat TM data,using mixed spectrum solution algorithm(SMA)to extract wetland elements from the seven periods of remote sensing data in the study area from 1990 to2020.From the perspective of elements,the change vector model(CVA)is used to analyze the change intensity of the alpine wetland ecosystem and the mutual transformation of elements.From two aspects(social environment,natural environment)to evaluate factor extraction,on the basis of repairable alpine wetland overall assessment model design,alpine wetland in ruoergai county of repair has carried on the science evaluation.On this basis,based on bayesian network model,from the Angle of probability analysis can repair the sensitivity of the appropriate level of each evaluation factor,identify different repairable under the appropriate level of key state subset,the alpine wetland repairable zoige sexual appropriate level optimization,optimization area,should be put forward optimization strategy,from the theoretical level to promote the repair of regional resources and rational development and utilization.Papers analysis to explore the main achievements the following aspects:(1)The alpine wetland ecosystem in Zoige County had the smallest change intensity during 1990-1995,with an average change intensity of 0.17;the most dramatic changes during 1995-2000 and 2000-2005,with an average change intensity of 0.38 and 0.28,respectively.In 2005-2010,2010-2015,2015-2020,the intensity of changes in the swamps distributed in Huahu,Haqiu,Cuolajian,and Heiqingqiao was relatively large,while the changes in other regions were relatively small.(2)The water element,vegetation element,and soil element of the alpine wetland ecosystem in Zoige County show a trend of mutual transformation.There are 12 types of changes in the three elements of the wetland in Zoige County.With 2000 and 2015 as the time node,the water component shows a decrease→ increase → increase,the vegetation component shows a decrease → increase → decrease,and the soil component shows an increase → decrease → increase.(3)Relative humidity,water percent and habitat suitability of black-necked cranes have a greater impact on the repairability of alpine wetlands,with the weights being 0.250,0.143,and 0.125.The area that is basically suitable for restoration is the largest in the study area,accounting for 29.07% of the total area of the study area.The areas suitable for restoration are generally characterized by well-developed river systems or humid climate.The soil types are mostly peat soil,swamp soil and meadow soil,with low soil erodibility;vegetation types are mostly swamp vegetation and meadow vegetation.(4)The appropriate level of repairability of alpine wetland in Zoige County is more sensitive to natural environmental factors than social environmental factors.Among natural environmental factors,relative humidity is the most sensitive,with a variance reduction value of 0.02575,followed by soil factors.The subset of key states changes in sequence as the appropriate level of repairability rises.The changing elements are climate and animal habitat,topography,soil,hydrology,vegetation,and landscape in sequence.(5)Among the 11 towns and towns in Ruoergai County that need to be optimized,there are 2 firstlevel optimization areas(Nenwa Township,Dazhasi Town),and 5 second-level optimization areas(Xiaman Town,Xiaman Sheep Farm,Tangke Town,Yellow River Prairie and Banyou Township),4 threelevel optimization areas(Maixi Township,Heihe Ranch,Hongxing Town and Axi Township).The optimal area priority should be restored.Suggested that local governments to strengthen the ecological protection of these areas,limiting its development,to ensure the harmonious development of economy,society and ecological environment.