| 沙漠与沙漠化 |
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| Evaluation of Ecological Security Pattern based on the Desertification Degree |
ZHANG Ning, CHANG Xue-li, LI Xiu-mei, SUN Xiao-yan |
| Geography and Planning College, Ludong University, Yantai 264025, Shangdong, China |
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Abstract Using the method of synthetical evaluation index and taking township for research-scale, this article has comprehensively evaluated the ecological security pattern based on the desertification degree in Naiman County. Evaluation procedure was divided into two levels. For the first level there were desertification land and un-desertification land, their weight values were 0.7 and 0.3 respectively. The second level included twelve land use/cover types such as mobile dune, woodland etc. These weight values were determined by the dynamic degree of land use/cover types during evaluation periods. The evaluation results showed that the ecological security situation had undergone alternation from extremely unsafe to safe and to slight safe during period from 1975—1985, to 1985—1995, and to 1995—2005, respectively, and the ecological security synthetic indices were -4.06, 2.56 and 1.06 respectively. The situation of ecological security pattern was worse between 1985—1995 and 1995—2005, but was improved during 1975—2005 in Naiman County.
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Received: 21 May 2009
Published: 20 March 2010
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2010, Vol. 30 
