Study On The Ecological Quality Of The Eastern Part Of Yuxi City Based On Improved Remote Sensing Ecological Index

A good ecological environment is a necessary condition for building a good and happy life.At present,human activities are frequent and social,and the global socio-economic development and natural climate are changing rapidly,and their impact on the ecological environment cannot be ignored,resulting in increasingly prominent ecological and environmental problems.How to analyse the dynamic change trend of ecological environment quality in the region,as well as scientifically evaluate the ecological environment quality,has gradually become one of the popular topics of current research.In this paper,Jiangchuan District,Chengjiang County,Tonghai County and Huaning County in the eastern part of Yuxi City are taken as the research objects.Based on their actual natural environment,soil erosion indicators are introduced to construct Improved remote sensing ecological indices(IRSEI)model,combined with Sen+MK trend analysis and geographic probes,etc.This paper analyses the characteristics and mechanisms of changes in the ecological environment of eastern Yuxi during 2000-2020,and captures the ecological environment at multiple scales,in a comprehensive manner and over a long time series.The main conclusions of this paper are as follows:(1)According to the current situation of the study area and with reference to relevant research and evaluation technical specifications,the results of IRSEI calculations are divided into five ecological grades.In 2005,the study area had the largest area of "poor" ecological quality among all years,with an area of about 46,291.410 hectares,accounting for 14.258% of the total area of the study area;In 2015,the study area had the largest area of excellent ecological quality of all years,with an area of about 40,469.940 hectares.In general,the ecological condition of most areas in the study area showed a trend of deterioration followed by improvement over the 20 years,but the overall ecological level was not high,with the average IRSEI value generally around 0.48.(2)The spatial and temporal analysis of the ecological quality of the study area shows that there is an obvious shift in the ecological quality level every five years,and the distribution direction of the ecological level in the 20-year period follows a stable direction of "northeast to southwest",which is basically the same as the distribution direction of the "three lakes".This direction is generally consistent with the distribution direction of the three lakes.The ecological quality in the study area is spatially significantly positively correlated,and the trend of change over the years shows alternating improvement and deterioration,with the future ecological quality in the eastern part of Yuxi accounting for19.770% of the total area of the study area,mainly in the northern part of Fuxian Lake,the eastern part of Huaining and the southern part of Tonghai,where the distribution of woodlands is relatively concentrated.(3)Exploring the driving factors affecting changes in ecological quality using geographic detectors.The probing factors,in descending order of influence on IRSEI,are:land use > population density > GDP > slope > elevation > density of land hazard sites.The two-factor and non-linear relationships between the two combinations of detection factors on ecological quality indicate that changes in ecological quality are not influenced by a single factor,but by a combination of natural and human-induced factors that interact with each other to enhance each other.This study is a reference for the analysis of the mechanism of ecological quality change and the formulation of ecological environmental protection measures,and provides a scientific basis for the protection and comprehensive management of the ecological environment in the eastern part of Yuxi.