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《Arid Zone Research》 2016-04
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Spatiotemporal Change of Oasis/desert Land and Its Landscape Response in Linze County in Recent 35 Years

GONG Jie;QIAN Da-wen;ZHANG Ling-ling;XIE Yu-chu;GAO Yan-jing;Key Laboratory of Western China's Environmental Systems of the Ministry of Education,Institute of Arid Environment and Climate Change,Lanzhou University;  
In this paper,a case study on the spatiotemporal change of the oasis/desert land and its landscape response in the townships and towns,Linze County,Gansu Province in the middle reaches of the Heihe River watershed in an arid area in northwest China,was carried out on the basis of interpretation and analysis of multi-source remote sensing images in 1977,1986,1993,2002 and 2012,landscape expansion index and GIS techniques. The results showed that there were both the aggregation and differentiation of spatiotemporal change of the oasis/desert land and its landscape response in Linze County on township/town scale. The change of the oasis/desert land in the north of the county and the townships and towns neighboring the sand desert was relatively stable and was gradually slowed down,where the expansion scale of the oasis patches was smaller than that in the townships and towns in the central part,and the desert landscapes were stable. In the townships and towns in the central part,the area of oasis/desert land change,trend and expansion scale of oasis patches were smaller than those in other townships and towns,and the desert landscapes were trended to fragmentization. There was no desert land in the townships and towns in the south neighboring the Qilian Mountains,and the scale and change rate of the oasis were small. The study results revealed that there was an internal differentiation of spatiotemporal change of oasis/desert land on the township scale,and the measures should be worked out for the oasis development and the desertification control based on the local conditions.
【Fund】: 国家科技支撑计划“气候变化对沙漠化影响与风险评估技术”(2012BAC19B09)
【CateGory Index】: P901
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