| In karst rocky desertification areas,the ecological environment is fragile,the economic development lags behind,and the relationship between human and land is tense and the contradiction is prominent.In response to the "big ecology" and "poverty alleviation" strategy,to accomplish the National Development and Reform Commission goals of “The 13 th five-year plan for the comprehensive control of rocky desertification in karst areas”,in a canyon karst plateau moderate-intensity of rocky desertification comprehensive demonstration zone--Huajiang demonstration zone as the center.The research area is selected as a demonstration area of huajiang river,which is located in guanling and zhenfeng state-level poverty-stricken counties,a typical rocky desertification area in southwest guizhou province.Based on the theoretical basis of landscape ecology and physical geography,RS and GIS technologies were adopted to obtain and process the image data of the research area,and FRAGSTAT landscape analysis software and SPSS statistical analysis software were used to calculate and analyze the landscape pattern changes and main driving factors of the research area.In order to expound the land use structure,land use space change,landscape pattern change,and analyze the main driving factors.In order to promote the implementation of the13 th five-year plan for the comprehensive control of rocky desertification and provide theoretical basis and technical reference for the analysis and research of landscape pattern changes and driving forces in karst rocky desertification areas.(1)Using RS and GIS technology to classify the landuse types in the research area,and divide Guanling county and Zhenfeng county into eight types: other forest land,forest land,shrub,cultivated land,grassland,water body,construction land and unused land.The dominant landscape,secondary landscape and drastic fluctuation landscape types of Guanling county and Zhenfeng county in the research area were distinguished by Arcgis10.2 calculation of different geographical areas.Research shows that: From 2005 to 2015,the main landscapes of Guanling county and Zhenfeng county were other woodlands,cultivated lands and grasslands,and the secondary landscapes were shrubs and woodlands,respectively.The landscapes that accounted for the violent fluctuation of the whole county area were water bodies and construction lands.(2)Through the land use transfer matrix,the dynamic transfer of various landscape types in the research area was calculated from 2005 to 2015,and the specific quantitative information of land transfer amount and land transfer amount in Guanling county and Zhenfeng county was obtained,providing a powerful data reference for further analysis of the land structure change and the interrelationship between land types in the research area.The research shows that from 2005 to 2015,the land transfer amount and the maximum land transfer amount in Guanling county and Zhenfeng county were all cultivated land,and the land with the highest activity of cultivated land landscape and the land with the least transfer amount was water.(3)Through Fragstat landscape pattern analysis software for the landscape pattern index in the studied area from the type level and landscape level on calculation and analysis,respectively,it is concluded: from 2005 to 2015,among all landscape types in Guanling county and Zhenfeng county,cultivated land landscape fragmentation degree was the highest,other woodland landscape dominance is highest,construction land and the lowest water landscape shape complexity,closer to the simple geometric shapes.From the macro perspective of the whole region,the distribution of dominant landscape in Guanling county is unstable,the landscape diversity and evenness fluctuate,and the landscape pattern is in the adjustment transition period.The landscape pattern of Zhenfeng county shows a stable and diverse and even development trend,and the system environment is in good order.(4)With the help of SPSS statistical analysis software,principal component analysis method was adopted to identify the main driving factors for the evolution of landscape pattern in Guanling county and Zhenfeng county,which can be summarized into two categories:?Social and economic development;?Population size and productivity development.The main driving factors of Guanling county and Zhenfeng county in the research area were analyzed,and the following conclusions were obtained: social and economic development,population change and productivity progress,promoting the comprehensive development of the region.Different land use types are affected by these driving forces,and also change to some extent.The most obvious ones are cultivated land landscape,construction land landscape and water landscape,which are greatly affected by human factors.In particular,the increase of construction land and water landscape area,the large amount of transferring andtransferring of cultivated land landscape and the high dynamic attitude are reflected. |
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