Land Use Change And Evaluation Of Ecological Environment Quality The Horqin Sandy

With the support of ENVI5.3 and Arc GIS10.2,the spatial analysis model of dynamic land use change,spatial change rate index and spatial autocorrelation were used to classify land use in the image,and the spatial structure change and utilization.The spatial and temporal succession patterns of land use in the study area were analyzed in terms of spatial structural changes and degree change;four ecological indices of greenness(NDVI),humidity(WET),dryness(NDSI)and heat(LST)were calculated based on four phases of remote sensing data,and the RSEI ecological index model was constructed use principal component analysis,and the changes in ecological environment quality in the study area were monitored and evaluated dynamically by means of mathematical statistic.Finally,the ecological response to land use change was systematically analyzed by studying the land use transfer pattern under different ecological environment change levels and the intensity of land use change types on ecological environment change.The main research results and conclusions obtained are as follows.(1)Among the land use change types in Naiman Banner from 2000 to 2018,desertified land as a whole showed a reversal trend,and cultivated land,forest and grassland and construction land showed a development trend;among them cultivated land and forest and grassland showed an expansion type of spatial change,and land with different degrees of desertification were all in decline;the transformation magnitude of cultivated land and forest and grassland and other land use types in the same period risen every year since 2000,and the spatial change rate index increasing year by year,and desertified land the spatial change rate indexes all decrease year by year;the land use degree is highly spatially autocorrelated,and the aggregation area is fixed in space,with high-high values aggregated in the southern loess area,and the area decreases year by year,and low-low values aggregated in the central sandy area,and the area decreases to a lesser extent.(2)Greenness and humidity play a positive role in the ecological environment quality of Naiman Banner,and dryness and heat play a negative role;the average increase of RSEI from 2000 to 2018 is 0.2326,an increase of 76.49%;the area of poor and poorer ecological environment quality decrease by a total of 1654.06 km~2,and the area of excellent grade increases by to 1048.17 km~2,of which poor and poorer the area of improved ecological environment quality during the study period is larger than that of degraded areas,and the improved area peaked between 2000 and 2006,with an area of5327.60km~2,accounting for 65.77%of the total area,and the degraded areas were mainly concentrated in the central sand area;the overall ecological environment of Naiman Banner was reversed and stabilized,but degradation still occurs locally.(3)The change of desertified land,forestland and cultivated land had a significant impact on the ecological environment quality in Naiman Banner,When desertified land tends to shift a lot of forest and grassland and cultivated land,the ecological environment was improved most significantly.When other land use types tended to shift a lot of Heavily and Extreme desertified land,the ecological environment is deteriorated most seriously.Therefore,in order to continue to improve the ecological environment of Naiman Banner in the future,it is necessary to continue to increase the control of desertification,as well as the protection of forest and grassland and arable land.