近25年嘉峪关城市景观格局变化及人文驱动力分析

Landscape pattern changes and their human-dimensional driving factors in Jiayuguan City in the last 25 years

基于RS和GIS技术及社会经济统计资料,以嘉峪关市1986,1996,2006,2010年Landsat TM/ETM+影像为数据源,分析了嘉峪关城市景观格局动态变化及其人文驱动力.结果表明:1986-2010年嘉峪关城市景观格局变化显著;土地利用强度大、土地利用系统复杂性增加;建设用地、城市绿地和水体的优势度增加明显,未利用地优势度减少.研究期间嘉峪关城市景观破碎度和复杂性增加,景观多样性和异质性增强.城市整体景观分离程度下降,聚集度增加、城市生态系统自然性下降.近25年来,政策和城市规划是嘉峪关城市景观变化的根本因子,城市化进程则是直接的诱因,人口和经济发展是主要的驱动因子,工业用地及基础没施用地需求是城市土地扩展的重要动力.

Based on the socioeconomic statistics data and four TM/ETM＋ images from 1986, 1996, 2006 and 2010, the landscape pattern changes and their human-dimensional driving factors in Jiayuguan City in the last 25 years were analyzed with RS and GIS techniques. The results indicated that the temporal landscape patterns of Jiayuguan City changed obviously and its urban areas also changed apparently from 1986 to 2010. Along with the unused land being decreased, the residential land, urban greenland and water area increased apparently. The whole landscape fragmentation was increased, and heterogeneity and diversity were enhanced. While the total aggregation of landscape pattern increased, urban ecosystems naturally decreased. Policy and urban planning were the dominant factors, urbanization was a direct factor, and population and economy were the main factors which have caused the landscape pattern changes in Jiayuguan City in the last 25 years. Expansion of land for industry and urban infrastructure was the most important factor to induce the urban land change in Jiayuguan.