Study On Spatial Evolution And Layout Optimization Of Land-use System In Hunan Province

Based on the theory of system theory and in accordance with the research idea of"land natural system-land use-land use system",this paper uses 3S technology and related analysis methods,and uses remote sensing image data of two time points in 2000 and 2016to study the evolution characteristics and driving machine of land use system for 2000-2016years in Hunan province.The structure trend of future development is forecasted by dynastic model,the characteristics and change process of land use system are analyzed by the ecological safety evaluation method,and the ecological function zoning of land use in Hunan province is carried out,and the optimized development measures are put forward.The main conclusions are as follows:(1)the change of land use in Hunan Province in the past 2000-2016 yearsIn the past 2000-2016 years,woodland has been the largest land use type in Hunan Province,and cultivated land is the second largest land use type.The area of woodland was reduced from 13.21in 2000 to 13.2 million hm~2,the area of cultivated land was reduced from6.13 to 5.93 million hm~2,the area of grassland was reduced from 757.3 to 689.5thousand and 500 hm~2,and the area of construction area was 289.9thousand hm~2,which was rapidly increased to 541.2 thousand hm~2.The water area increased from 715.1 to 723.9 thousand hm~2,and the unused land increased from 74.8 to 99.8 thousand hm~2.The spatial variation of cultivated land and construction land is the largest.The construction land is mainly converted from the cultivated land and woodland,and the cultivated land is mainly converted into construction land,woodland and water area,mainly from woodland and water area.The larger change of land use style of 14 cities in Hunan province are construction land and cultivated land in 2000-2016 years.The area of cultivated land decreased,and the area decreased from 300 hm~2 to 31300 hm~2.The area of construction land is increasing,with an increase of 3700 hm~2 to 32800 hm~2.The total change speed was faster for comstructed land,the dynamic degree of construction land in each area increased significantly,and the largest growth rate was Changsha.There are obvious differences in the change of land use types in Hunan Province,of which the biggest difference is Z=1707.09,the smallest difference is Z=1.98,the rest are water,woodland,construction land and cultivated land in turn.(2)spatial evolution of land use in Hunan province in 2000-2016 yearsIn the past 2000-2016 years,the distribution pattern of land use in Hunan has changed little,and local changes are still very significant.The woodland mainly distributed in the eastern,southern and western mountainous areas of Hunan,and the area of Huaihua,Zhangjiajie,Xiangxi,Yongzhou and Chenzhou increased,the largest increase was Xiangxi,and the land area of other areas declined.Cultivated land is mainly distributed in Yueyang,Yiyang,northeast Changde,Changzhutan area and Loushaoheng area.It is located in the gentle terrain and central region of Dongting Lake and Xiangziyuanli River Valley flat terrain and central area,the area of cultivated land is obviously reduced.The construction land is distributed by point form transform by punctuate in the eastern region and in various regions and the urban system with the core of Changzhutan Urban Agglomeration is formed.The water area decreased significantly in Yiyang and Yueyang,and converted to cultivated land.However,the water area in some hilly areas increased considerably.(3)evolution of land use level in Hunan Province in 2000-2016 yearsThe distribution of cultivated land in Hunan Province in 2000 was widely distributed in Hunan province.In 2000,the cultivated land was mainly distributed in two and first places,which accounted for 59.1%and 26.51%of the cultivated land,the rest mainly in three and other places,the proportion was 14.4%,the quality of cultivated land was higher and the structure was reasonable.In 2016,the cultivated land in Hunan province was mainly distributed in two and three places,which accounted for 66.49%and 17.37%of the cultivated land area respectively.The proportion of the first land in Hunan province was16.15%,and the first grade decreased obviously in the 16 years,and the quality of cultivated land decreased.(4)comprehensive evaluation and optimization of land use.According to the driving mechanism of land use type evolution to determine the main driving factors,the system dynamics simulation of three land use structure changes to determine the future of Hunan province,it must adhere to the route on ecological protection of the land use.On the basis of land ecological security evaluation and ecological function zoning study,the land ecological security index system of Hunan province was constructed.The dynamic evaluation of land ecological security status of 14 cities and states in 2000 and2016 in Hunan Province found that the comprehensive evaluation value of land ecological security in most cities in 2016 should be lower than that in 2016.In 2000,the situation of land ecological security in 2016 was worse than that in 2000.The land ecological function of Hunan province is divided into two first level ecological functional areas and seven ecological functional subregions,and the direction of the optimization and control of land use in different functional areas is put forward in combination with the results of land ecological environment problems,land use types and land ecological safety assessment in Hunan province.