| The rapid development of multi-source data provides a more multidimensional analysis angle for studying the law of land use evolution.The space carrier carried by land resources is the basis for the rapid development of society and economy.Under the background of the prominent contradiction between economic development and land use,studying the characteristics and driving forces of land use evolution based on multi-source data will help to deepen the understanding of the causes of land use evolution.It is necessary to study and formulate countermeasures for efficient utilization of land resources from various aspects.At present,there are many theoretical and empirical studies on land use evolution at home and abroad,but few studies have conducted in-depth analysis of land use evolution from the perspective of multi-source data fusion.Based on this,on the basis of related research at home and abroad,this paper collects multi-source data and processes the data,including the spatialization of nonspatial data,the integration of traditional data and emerging data,and selects Chang-Zhu-Tan cities with dramatic land use evolution.As the research area,the ArcGIS fusion database for land use evolution research was constructed,and the GIS-Logistic model was established to simulate the independent variabledependent variable factors of different grid scale data,and to quantify the characteristics and driving forces of land use evolution in the past 25 years.Analysis to reveal the characteristics of regional land use evolution and the role weights of different driving factors on land use evolution.The research found that:(1)Cultivated land and forest land are the main components of the land space of Changsha-Zhuzhou-Xiangtan Urban Agglomeration,and the sum of the two accounts for about 90%.From 1995 to2018,the land use evolution of Changsha-Zhuzhou-Xiangtan Urban Agglomeration showed steady to dramatic changes,And it is dominated by the rapid expansion and change of towns and other construction land.The expansion types were the combination of extensional mode and internal filling-extensional mode respectively.From 1995 to 2018,in the Changsha-Zhuzhou-Xiangtan Urban Agglomeration,the area of cultivated land decreased by 579.63km~2,the area of forest land decreased by 469.99km~2,the area of land used for building increased by 976.67km~2,the area of water area increased by 68.94km~2,and the area of unused land and grassland did not have obvious changes.(2)In terms of spatial transfer of land use,during 1995-2005 and 2005-2018,land use transfer was mainly the conversion of cultivated land and forest land to land used for building,and the degree of this transfer was more severe during 2005-2018.During the two change periods,the areas of cultivated land and forest land converted to land used for building were 84.33 km~2,89.45 km~2 and 488.36 km~2,397.98 km~2 respectively.The increase in land used for building was mainly distributed in Changsha County and Yuelu District,Ningxiang County and Wangcheng District.(3)The action type of driving factor of land use change in the two phases changes with the data grid scale of independent variable and dependent variable.When the scale is 500 m×500 m,the land used for building,cultivated land,forest land and water body evolution model fitting degree are the highest.(4)The driving factors affecting the changes of cultivated land,forest land,land used for building and watershed during 1995-2005 and 2005-2018 are different,but the driving factors of natural environment dimension and location and transportation dimension are the fundamental conditions for the changes of land used for building,cultivated land,forest land and watershed,and the social economy,industrial drive and population growth accelerate the rate of changes of these sites.Based on the research results,this paper puts forward corresponding countermeasures and suggestions for land resource utilization in Changsha-Zhuzhou-Xiangtan Urban Agglomeration. |
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