安徽省城镇用地时空格局演变研究

RESEARCH ON THE EVOLUTION OF URBAN LAND USE PATTERN OF ANHUI PROVINCE

基于1995年、2005年、2015年三期遥感数据,通过GIS空间分析工具,综合选用土地转移矩阵、城镇用地扩展速率和强度、扩展差异指数等指标,定量测度安徽省近20年城镇用地时空格局演变。研究发现:(1)各市城镇用地面积明显增加,地区层面占比上呈现皖中、皖南增长而皖北减少趋势,总体呈皖北>皖中>皖南的分层格局;(2)各市城镇用地转入源中耕地和林地贡献最大,其来源趋于多元化,但转出量极小;(3)1995~2005年,除合肥外各市扩展速率和扩展强度基本相当,2005~2015年各市差异显著,除省会外芜湖扩张明显,整体上皖北市从中快速转向中低速扩张,皖中、皖南城市从中低速转为中高速扩张;(4)江北城市不同程度向省会偏移,而江南城市未表现出此特征。

Based on the remote sensing data of Anhui Province in 1995,2005 and 2015,land transfer matrix,urban land use expansion rate,land use expansion intensity,expansion difference index and other indicators were comprehensively selected by GIS spatial analysis tool to quantitatively measure the spatial and temporal pattern evolution of urban land use in Anhui Province in recent 20 years. The result shows that:(1)Area of urban land of each city increased significantly,while the proportion of the regional level showed a trend of increase in the middle and southern Anhui and decrease in the north of Anhui,which generally showed a stratified pattern of the northern region of Anhui > the middle region of Anhui > the southern region of Anhui.(2)The contribution of farmland and forestland to urban land transfer is the largest in each city,whose source tends to be diversified. Meanwhile the amount of urban land transfer is very small showing strong irreversibility.(3)From 1995 to 2005,the land-expansion-rate and extension-strength of all cities are basically similar while the advantages of the provincial capital are quite prominent. From 2005 to 2015,the differences between the cities are obvious. Except for the provincial capital,the expansion of Wuhu is obvious. Overall,characters of cities show from rapid growth to low expansion in the northern region of Anhui,while low speed to high speed expansion in the middle region of Anhui and the southern region of Anhui.(4)Cities on the north bank of the Yangtze river were attracted by Hefei and showed the existence of different degrees to its deviation,while cities on the south bank of the Yangtze river did not occur obvious to the provincial capital deviation.