Coynty Environment Quality And Ecological Assessment Based On Multitechnolog

The ecological environment has great impact on human health and social development.Its quality is related to the construction of a harmonious society and the realization of the goal of sustainable development.The quantitative evaluation of the regional ecological environment quality and development trend,which provides scientific basis and theoretical basis for regional environmental governance and planning,has become one of the most popular research topics.This paper,taking Kuche County of the Xinjiang Uygur Autonomous Region as the research object,obtains the environmental quality monitoring data and historical data of Kuche county through field survey,field sampling,sample testing and data collection,and evaluates the water environment quality,atmospheric environment quality and soil environmental quality status of Kuche county respectively.With the two remote sensing images of 2006 and 2015 as the basic data,the remote sensing index of desertification status,vegetation growth,salinization status and humidity condition was selected as the index to construct the evaluation of the ecological condition of Kuche County by remote sensing ecological distance index（RSEDI）.The evaluation results of environmental quality in Kuche county showed that:（1）the quality of water environment in Kuche county was better.In 2015,the water quality of surface water in Kuche county was in line with the standard of surface water environmental quality（GB3838-2002）class II,and the quality of surface water environment was up to the standard.In the period of 12th Five-Year,the water quality of the surface water in Kuche county was better.There was no significant change in the concentration and water quality of the main pollutants in each river,and all the water quality categories reached the class II water quality standard.In 2015,the annual average value of the single factor of groundwater source reached groundwater quality standard（GB/T14848-2017）class III standard,the standard rate of water quality was 100%,and the water quality level was good.Through dynamic analysis,the quality of 2015 water environment is better than that of 2005.（2）the environmental air quality in Kuche County in 2015 was poor.In 2015,the average annual concentration of SO₂and NO₂ in Kuche County reached the level of national air quality grade II,and the annual mean of inhalable particulate matter exceeded the national level II standard.The main pollutants are inhalable particles.The air quality in 2006 was better than that in 2015,but the dust weather decreased.（3）in 2015,the soil environmental quality of Kuche County monitoring area was moderately salinized,and the cultivated soil was strongly alkaline.（4）the disposal capacity of domestic waste and industrial solid waste can meet the current development needs of Kuche County,but there is no special hazardous waste disposal site for hazardous solid waste,and there is a huge hidden danger.The evaluation results of ecological conditions in Kuche county showed that:（1）the index of desertification index（DI）,salinization index（MSI）,vegetation index（GI）and humidity index（WI）selected in the construction of RSEDI model can accurately reflect the ecological situation in Kuche county.（2）the ecological status of Kuche County in 2006-2015years was in the middle level,the change of each grade and area was small,and the ecological condition tended to be stable.It showed that the economic development of Kuche county had little influence on its ecological condition in the last ten years,and the oasis had a certain effect on the preservation of the ecological condition of Kuche county.（3）the spatial distribution of the ecological environment in Kuche county was not obvious in the 2006-2015year.The ecological condition is excellent and the good grades are mainly distributed in the oasis and mountainous areas with high vegetation coverage,high soil moisture,salinization,low desertification level,and low remote ecological distance index in the periphery of oasis,which is mainly medium.And poor grades.