【摘要】 讨论了从计划经济到转型期中国河谷盆地型城市空间扩展与土地利用发展趋势及理论设想,并以兰州市为例进行了实证。在GIS技术支持下,以不同年份兰州市建成区土地利用现状图以及2004年卫星遥感图为基础,在总结城市空间扩张特征、用地结构转变等整体特征的基础上,利用弹性指数、转移矩阵和动态模型等若干方法,分析了1949～2005年城市土地利用扩张、结构特征和动态变化,得出了城市新增用地扩展经济弹性指数由4.29上升到5.02,1976～2001年道路广场开发度高达19.30%,耗减度仅为1.37%,2001～2004年建成区内公共设施用地开发度跃至19.39%,农业用地耗减度高达13.66%,用地扩展弹性系数远超过1.12的合理范围,转型期城市用地信息熵值升高,建设用地向滩地、山地扩张趋势显著等结论。更多还原

【Abstract】 On the basis of hypotheses,this paper has established the theoretical assumption which is urban spatial expansion and land inner structure transformation of valley-basin cities in China by taking Lanzhou city as a case.On the basis of the present land use map of built-up area in Lanzhou and remote sensed images in 2004 by GIS,the paper picks up pertinent datum and analyzes the characteristics of urban spatial expansion and land inner structure transformation of Lanzhou from 1949 to 2004.In other words,on the basis of summarizing the total characteristic of urban spatial expansion,land-use structure transformation,land use expansion and industry driving forces,the paper thoroughly analyzes the temporal changes,spatial process and structure characteristic of urban land expansion,using a lot of indices,such as annual expansion contribution rate,annual expansion speed,population elastic index,economic elastic index,compactness index and so on.During the transitional of period,large cities’ spatial expansion of the Chinese river valley-basin city will be inevitable,the proportion of land using for services increased,the expansion trend from urban traditional centre to periphery is powerful although the central tendency is obvious.The expanding trend to high-level terraces and beach is obvious because of the land shortage.Some of the functions of the urban "spill-over"(from the basin in the bounce) effects enhanced,and land development intensity improved rapidly.An empirical study of Lanzhou City,confirmed the basic theoretical assumption that is from planned economy period to transformation period,the space expansion and land-use changes in the structure of the Lanzhou City factors can be summarized as natural conditions,planning management and the guidance of development strategy,policy changes,the changes of system environment and social and economic condition,historical culture and so on.Some of the characteristics of urban spatial expansion are identified as follows: the expansion form changed from a single external expansion to a combination form of external and internal expansion,but also with rationalization and proper order as well as structural feature and the dynamic change from 1949 to 2005.The rapid growth periods of urban land expansion are during 1949-1959 and 1989-2004,and the slow increase period is 1959-1989,the economical elastic index of the newly added urban land expansion rises from 4.29 in 1976 to 5.02 in 2001,and path square development reaches as high as 19.30% and the depletion is only 1.37% from 2001 to 2004.The built-up district reaches as high as 13.66% as well as the land expansion elasticity coefficient of the public utility land development leaps to 19.39% and the agricultural land depletion far surpasses 1.12,a reasonable scope.In transformation period,the benefit of newly increased land is relatively high,but also rose gradually during urban land expansion.On the whole,urban construction land mainly comes from agricultural land,and during transformation period,the urban construction land expansion tends to occupy beach land and high grade terraces(tsubochi,platform,mountain).更多还原