中文摘要：

城市发展到一定时期就会产生城乡结合部,城市的不断发展,必然导致土地利用数量、土地利用结构和城乡布局的变化。基于GIS及ENVI技术的支持,对长沙市城乡结合部1991年、2004年及2013年三个时间的TM遥感图像进行解译并分类,从土地利用的数量变化、速度变化、类型变化及空间分布变化等方面分析长沙市城乡结合部的时空格局变化特征,并探讨影响其变化的因素。分析结果显示：1、1991-2013年长沙市城乡结合部土地利用变化较大,且不同类型用地的变化情况有较大差异。具体表现为：耕地面积不断减少,且其所占各地类面积总和的比例也呈现减少趋势,且减少的幅度较大;林地面积持续减少,且其所占各地类面积总和的比例也随之持续减少;建设用地面积持续增加且增加幅度较大,但研究后期增加速度有所放缓,且耕地和林地向建设用地转移较多,城乡结合部土地利用变化明显;水域面积所占比例减小,而未利用地所占比例有所增大。2、影响长沙市城乡结合部的因素归纳为自然因素和人文因素两部分,人文因素又包括体制决定、人口与经济驱动、政府引导、交通牵引、生态建设等五个方面。

英文摘要：

Integration of town and country was the products of city development to a certain stage. Continuous development of the city can certainly lead to the restructuring and substitution of land-using state an structure in ruralurban fringe. With the technical support of GIS and ENVI, this article reached a conclusion that the range of ruralurban fringe had been changing in Changsha. At the same time ,with the help of the ENVI in year 1991, 2004 and 2013, the changing characters of rural-urban fringe in Changsha were analyzed and the reasons were discussed through observing the area ratio of the land-using types and transfer matrix. The results showed that the changes of land-using in rural-urban continuum of Changsha presented the characteristics as following： cultivated area decreased continuously, and the proportion of the sum decreased. But the range of decreasing became small. Woodland area also decreased continuously, and the proportion of the sum continued to decrease. Construction land area increase by a large margin, but the growth rate of the sum decreased in the later study. Moreover, a large amount of arable land and woodland changed to Construction land. The change of using rural-urban continuum land was obvious. The proportion of water area, but the proportion of unused land increased. The natural factor and human factor contributed to irffiuencing the rural- urban continuum. What＇ s more, human factor includes system decision, population and economic driver, government guidance, transportation traction and ecological construction.