Analysis of patterns and ecological security trend of modern oasis landscapes in Xinjiang, China |
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Authors: | Junfang Huang Ranghui Wang Huizhi Zhang |
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Institution: | (1) Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China;(2) Graduate School, Chinese Academy of Sciences, Beijing, 100049, China |
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Abstract: | Ecological security has become so important that it will affect the national security and social sustainable development.
In this paper, a case study on the ecological security indexes of modern oasis landscapes in Beitun Oasis, Xinjiang, was carried
out. The spatial neighbouring parameters, such as the contiguous length, measure of area and patch quantity of oasis landscape
patches, affected by desert landscape patches were calculated by using GIS-based buffer analysis, the method of calculating
ecological security indexes of oasis landscape was developed, and the dynamic changes of patterns and ecological security
indexes of the oasis landscapes since recent 30 years were analyzed. The results showed that soil salinization or alkalization
and paludification were major factors affecting the ecological security in Beitun Oasis. Therefore, measures should be taken
actively to prevent and control secondary salinization and paludification. The ecological security indexes of the oasis landscape
in 1972, 1990 and 2005 were 78.91, 82.28 and 83.86, respectively, which showed the degree of security is improving, and the
environment was developing harmoniously between human and nature. The methods of evaluating ecological security based on the
spatial neighbouring relations between landscape patches can be used to reflect preliminarily the ecological security patterns
of landscapes. |
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Keywords: | Oasis landscapes Ecological security Patch Secondary salinization Paludification Beitun Oasis China |
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