Abstract
Based on Landsat TM/ETM+ images in 1990,1999,2006 and 2009 of Jinta and RS and GIS technique,oasis change models(change trend,dynamic model,change trend indexes,oasis-desert transition matrix) were used to analyze the spatio-temporal change of Jinta oasis in the latest 20 years.The results showed that:(1) the area of oasis increased continuously and desert decreased correspondingly,and the oasis area increased by 199.49 km2 from 1990 to 2009.(2) Jinta oasis was in an unbalanced status,and the area extent degrees of different oasis were different in the latest 20 years.The extent of oasis area of different township were ranked as Yangjingziwan townPrecinct of Jinta countyDongba town Sanhe town Gucheng town Jinta town Zhongdong town Dazhuangzi town Xiba town.(3) The whole landscape fragmentation of Jinta oasis was decreased,the contagion was increased,and the matrix component was reduced.The oasis which expanded apparently were mainly located in Yangjingziwan town,Precinct of Jinta county,Dongba town,Jinta town,Gucheng town,and Sanhe town.(4) The human-dimensional factors were the major cause of the spatio-temporal change of Jinta oasis in the latest 20 years.Water resources development and utilization was the prerequisite of oasis expansion,and oasis change were co-effected by human activities,immigrate,economic development and regional policy and scientific and technological advance.
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