| 生物土壤与生态 |
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| Extraction of Precautious Line and Analysis on Ecological Environmental Change in Oasis Desert Transitional Belt—A case study of Hetian oasis,Xinjiang |
| LI Xie hui; TIYIP Tashpolat |
| 1.Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China; 2.College of Resource and Environmental Sciences, Xinjiang University, Urumqi 830046, China |
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Abstract Taking the Hetian oasis in arid area as an example, the paper firstly applied the time series of MODIS data to classify the SMVC-NDVI (Seasonal Maximum Value Composite NDVI) images of 2002 and 2004, then computed the multi-degree of land-cover change types, the important degree and the evaluation grade, lastly identified that the region of violent ecological environmental change in arid oasis is the boundary between low-grass and mid-grass. From classified images the precautious lines on ecological environmental change of transitional belt was extracted. The result shows that the area within the precautious line generally shrunk from 2002 to 2004, which expressed that the ecological environment of oasis was degraded in the three years. After quantitatively analyzing the reasons of oasis degradation, they are the human activities and the natural factors with climatic factor as main, the authors think that the precautious line has good indicative significance for continuous monitoring on vulnerable ecological environment and researching on sustainable development of oasis-desert transitional belt.
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Received: 16 October 2006
Published: 20 January 2008
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2008, Vol. 28 
