Study on the oasis landscape fragmentation in northwestern China by using remote sensing data and GIS: a case study of Jinta oasis |
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Authors: | Guo Ming Yu Wenbing Ma Mingguo Li Xin |
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Institution: | (1) Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China;(2) State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou, Guansu, 730000, China |
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Abstract: | The purpose of this study is to investigate the oasis landscape fragmentation in northwestern China’s arid regions. Landscape
maps of Jinta oasis were compiled by using GIS based on Landsat TM data of 1990 and 2000. Landscape indexes for evaluating
fragmentation are patch area, patch density, corridor density and split index. Results indicated many difference. First, between
the years 1990 and 2000, the landscape fragmentation in Jinta oasis decreased slightly. Second, the area of the matrix decreased
at the class level. The landscape fragmentation of the matrix (bare soil) increased as a result of increased influence of
human activities on matrix and was opposite to the irrigated farmland whose area is larger and more aggregated in 2000 than
in 1990. Third, dense corridor system is one of the most prominent characteristics of the arid regions. It is one of the key
factors resulting in the landscape fragmentation; especially the fragmentation within the same patch types. The corridor density
of irrigated farmland, residential area and forestland were quite large in Jinta oasis both in 1990 and 2000. The pattern
of Jinta oasis is characterized by agricultural oasis embedded in Gobi and in the desert, where the ecosystem was disturbed
strongly by the intense human activities. |
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Keywords: | Landscape fragmentation Remote sensing GIS Arid region Human activities Ecosystem |
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