摘要
目前,各国学者往往使用各类指数模型来研究土地利用及其变化,本文试图采用一种新的方法——空间罗伦兹曲线——更为直观、简洁地显示土地利用的集散分布及其变化。运用遥感与GIS技术,绘制了西藏拉萨市城关区1991年、2000年及2005年的土地利用随高程带分布的罗伦兹曲线,并在此基础上计算了各土地利用类型的集中化指数。研究结果表明,罗伦兹曲线直观地展示了研究区1991-2005年的土地利用随高程带分布的集散程度变化不大。其中,草地的分布最均匀,林地和建设用地分布最为集中。基于罗伦兹曲线计算的集中化指数进一步准确地显示了土地利用集散程度的变化:耕地和草地的集中程度经历了先降后升的过程;水域的集中程度先升后降;未利用地在高程带上的分布逐渐趋于集中;林地和建设用地的集中与分散程度不变。
At present,scholars tend to use many kinds of index models to study land-use,this article attempts to adopt a new approach-space Lorenz curve-to display the distribution of land-use and its changes more intuitive and more concisely.In this paper,remote sensing and GIS technology are used to map the Lorenz curve of land-use distribution on elevation bands of 1991,2000 and 2005 in the Chengguan District of Lhasa,Tibet.On the basis of that,we calculate Centralization Index of each land-use type.The results show that the Lorenz curve demonstrates intuitively that in study area,there are little changes in distribution degrees of land-use on elevation bands from 1991 to 2005.Among these,the most uniform distribution is grassland,and the most concentrated ones are woodland and construction land.Centralization Indexes based on the Lorenz curve show further and more accurately the degree of distribution of land use changes：the concentration degrees of arable land and grassland experienced the process of first dropped and then raised;the concentration degree of water first increased and then decreased;the distribution of unused land on elevation bands becomes more and more concentrated;the degrees of distribution of forest land and construction land were unchanged.
出处
《水土保持研究》
CSCD
北大核心
2010年第1期228-231,共4页
Research of Soil and Water Conservation
基金
国家科技支撑项目(2008BAK49B02)
国家863重点项目(2007AA120306)
国家自然科学基金(40972225)
中国地质大调查项目(1212010818085)
