The Research On The Spatial Evolution And Driving Forces Of Rural Residential Land Use In Karst Regions

Rural residential land is a basic rural land use type.Its spatial evolution can profoundly reflect the local natural environment,economic development and social and cultural changes.The rural residential land in Karst regions were studied,analyzing the evolution characteristics and reveal the internal driving mechanism,to guide the ecological fragile regions formulate scientific and reasonable government poverty alleviation policy,promote the optimization of regional spatial layout,and has important significance.This paper takes Huanjiang Maonan Autonomous County as the study area,taking the comparison and analysis of Karst area and non Karst area as the main line,from aspects of scale and form,describe the characteristics of the spatial evolution of rural residential land in Huanjiang county from 1999 to 2015 and division of land type;and contains natural economic and social policy and the four categories of 14 single driving factors were analyzed one by one;on the basis of geographical weighted regression model,the main driving mechanism and the internal mechanism of the evolution of urban land use comprehensive analysis of county rural residents of the regional intermal point,finally put forward the countermeasures and suggestions of the layout of rural residents point.The main conclusions are as follows:(1)The spatial evolution of rural residential land in Huanjiang county mainly showed the following characteristics:?The spatial distribution characteristics of the rural residents ' land are "the South dense north sparse",the spatial distribution of which is transformed from "the low value flake distribution of the county" to the "medium high value block agglomeration" to form a massive high-density area in the non Karst regions.?The total amount of land use scale is significantly increased and regional difference is present,and the high value transfer area of land scale is mainly distributed in the central non-Karst regions and the potential rocky desertification regions in the county.The average land scale is increasing,but it is still small scale.The irregular degree of land use in rural regions has been higher and the irregular degree continues to increase,from the shape of the Karst village to the whole area irregular change,and the transition degree of the non-Karst village is more obvious.The degree of spatial agglomeration increased significantly,but the overall distribution was still more diffuse.?The change of rural residential land types in Karst villages and non Karst villages is obviously different.(2)The impact of single driving force factors on the spatial evolution of rural residential land in Huanjiang is different:?The influence of elevation,slope,terrain fluctuation and the natural environment of rivers on the spatial evolution of rural residential land is tending to low value.?Economic technology is the dominant factor at this stage.The rural road has a significant impact,while the influence of the main roads is slightly weakened;the influence of the town center is mainly within 6000 meters;the level of agricultural science and technology also affects the spatial evolution of land use in rural regions.?In addition to the driving force of population quantity and population quality,minority ethnic group identity also indirectly affects the spatial evolution of land use of Huanjiang County rural residents.?During the study,the government's guiding role is very significant due to the ecological migration policy and the development of ecological construction projects such as "returning farmland to forest".(3)Through the establishment of geographically weighted regression model(GWR),and the role of driving force mechanism of land spatial evolvement of rural residents in different regions of internal research on Huanjiang's results shows that:?Compared with the traditional OLS method,difference GWR model can better reveal the rural residential land change driving force factors of space.?spatial evolution of rural residential land use and distance from township-level roads distance from the urban center,farmers per capita income is mainly positive correlation,the scope of action of a large number of "South High North Low" spatial distribution characteristics;the slope low value area has the most notable influence on the central Karst regions;the influence of elevation low value area is opposite from north to South positive negative effect,the influence of the driving force of the river is most significant in the Huanjiang birthplace area.?The leading driving force of the village changes with the geographic location.The natural conditions still play a leading role in most of Karst area.The economic level and location conditions are the main driving force that affects the non Karst area.