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《Urban Environment & Urban Ecology》 2012-02
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Urban Expansion and Landscape Characteristics of Land Cover of Jiayuguan City during 1986-2010

XIE Yu-chu1,LIN Xing-zhou2,GONG Jie1,XIE Yao-wen2,YU Jian2(1.Key Laboratory of Western China's Environmental Systems(Ministry of Education),Lanzhou University, Lanzhou 730000,China;2.College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)  
On the basis of the Landsat TM/ETM+ images of Jiayuguan City in arid area of China in 1986,1996,2006 and 2010,the change of urbanization and land cover were detected by the main road network and urban expansion index,and the spatial and temporal changes of landscape pattern were analyzed.The result indicated: 1) While the main road expanded obviously,the area of city increased rapidly.The length of main road of Jiayuguan City increased 100.20 km,urban area grew at an average annual rate of 5.10% and increased from 2 220.03 hm2 in 1986 to 5 048.22 hm2 in 2010.2)The temporal landscape patterns of Jiayuguan City changed differently from 1986 to 2010.The areas of construction land,urban greenland and water area increased 2 003.74 hm2,655.30 hm2 and 169.15 hm2,however,the unused land decreased 2 828.19 hm2 during the past 25 years.The fragmentation of urban greenland and construction land increased,but the fragmentation of unused land decreased.3) The patch types and distribution were becoming more balance,the total diversity and heterogeneity were increased.4) The whole landscape of Jiayuguan City was strongly affected by human activities.Urban green land and water area played an important role in maintaining and improving urban environment,and urbanization caused the increase of urban green land.
【Fund】: 国家重点基础研究发展计划(973计划)——干旱区绿洲化荒漠化过程及其对人类活动、气候变化的响应与调控(2009CB421306);; 国家自然科学基金委创新群体科学基金项目——西部环境变化(41021091)
【CateGory Index】: TU986
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