Temporal And Spatial Change Characteristics And Driving Factors Of Desertification In Aksu Region From 2009 To 2019

Desertification is a dynamic process.In the context of forestry engineering construction,its temporal and spatial distribution is important information for the restoration and reconstruction of fragile ecological environment.This thesis takes Aksu region as the research area,based on"3S"technology,selects from climate,vegetation,soil and other aspects The index builds a desertification degree evaluation system,analyzes the temporal and spatial evolution characteristics of desertification type and degree;combines geographic detectors and correlation analysis to explore the relationship between various driving factors and desertification,and further predicts the future development trend of desertification in Aksu area;Suggestions on desertification control in Aksu area provide important scientific basis for the construction of desertification control projects.conclusion as below:(1)Wind erosion desertification was the most widely distributed in Aksu area,and the spatial and temporal changes of desertification were significant from 2009 to 2019,and the desertification area showed a trend of decreasing year by year,with a total decrease of 4.4×10~5 hm~2 and a decrease of 3.69%in the proportion of desertified land to the total area of the study area.Saline desertification was mainly distributed in the cultivated land and its surrounding areas,and wind erosion and saline desertification shrank at a transfer rate of 0.49%and 1.11%in Aksu city and Wensu county,respectively.Water erosion desertification shows a trend of increasing first and then decreasing,and the change area is mainly located in Kucha County.The increase of non-desertification area is absolutely dominant,the ecological environment is gradually improved,and desertification control forestry and grass measures such as the Three North Protection Forest Project and the Returning Cultivated Land to Forest Project play a vital role in the treatment process.(2)From the perspective of desertification degree,light desertification is mainly transformed into non-desertified land,and the transfer rate of light desertification is higher than other degrees,among which the transfer rate of light water erosion desertification is the highest(8.07%)and its transfer occurs mostly around the oasis area;under the influence of afforestation area and continuous increase of forest coverage,the reversal of very heavy and heavy desertification occurs to different degrees,and the new rate of medium desertification is higher than the transfer The new rate of moderate desertification is higher than the transfer rate,and the overall desertification degree shows an improvement,but the very severe desertification still accounts for more than 20%of the area of Aksu region.(3)The results of the factor detector show that desertification in the Aksu region is highly influenced by temperature under the effect of a single factor,with a q value of 0.55;The interaction effect of multiple factors in the evolution of desertification in the study area is stronger than that of single factors,and the mode of action is two-factor non-linear enhancement and linear enhancement,and the interaction between mean temperature(0.57～0.77),vegetation cover(0.51～0.63)and other factors affects the development of desertification;the correlation distribution results show that the effect of changes in driving factors on different areas The correlation distribution results showed that the effect of the change of the driving factors on different regions differed.(4)Based on the relationship between desertification and vegetation cover and other driving factors,transfer probability matrix and transfer area matrix to establish desertification transfer suitability atlas and redistribute the desertification degree,the prediction finds that the future desertification degree in Aksu region keeps reversing trend,mainly showing the decrease of very heavy desertification and local area will experience land desertification,and prevention and control measures should be formulated based on desertification driving factors.