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JOURNAL OF DESERT RESEARCH  2011, Vol. 31 Issue (5): 1267-1272    DOI:
生物土壤与生态     
Vegetation Coverage Change of Tsagan Us Oasis in DulanCounty, Qinghai Province, China
CAO Yong-xiang1, LIU Xiao-dan2, ZHANG Ke-bin3, CHEN Ming3
1.Hydrochina Xibei Engineering Corporation, Xian 710065, China; 2.MCC Capital Engineering and Research Incorporation Qinhuangdao Co. Ltd., Qinhuangdao 066004, Hebei, China; 3.Ministry of Education Key Laboratory of Soil and Water Conservation and Desertification Combating, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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Abstract  In order to study variation of vegetation coverage of Tsagan Us oasis in Dulan county in Qinghai Province of China, the grade map of vegetation coverage in Tsagan Us oasis during different period in 1990—2006 was extracted basing on normalized NDVI data, then the interannual variation of the vegetation coverage was quantitatively analyzed. The result showed that the vegetation coverage of Tsagan Us oasis presented a fluctuating increase trend during the 16 years, and the change range of the vegetation coverage of every grade from 2001 to 2006 was greater than the one from 1990 to 2001. Generally, the vegetation coverage had a restoration trend from 1990 to 2001, and there was 50 017.50 hm2 very low coverage vegetation which was transformed to high coverage vegetation. From 2001 to 2006, there was a increase of 6 026.85 hm2 of very low coverage vegetation and a decrease of 4 048.47 hm2 high coverage vegetation, indicating local degradation of vegetation coverage. The main factors influencing vegetation coverage included: ecological recovery measures, climate change and water resource change. The research can provide a theory support for vegetation restoration and desertification combating of the research area.
Key words:  NDVI      oasis      vegetation coverage      Dulan county     
Received:  11 January 2010      Published:  20 September 2011
ZTFLH:  Q948  

Cite this article: 

CAO Yong-xiang;LIU Xiao-dan;ZHANG Ke-bin;CHEN Ming. Vegetation Coverage Change of Tsagan Us Oasis in DulanCounty, Qinghai Province, China. JOURNAL OF DESERT RESEARCH, 2011, 31(5): 1267-1272.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2011/V31/I5/1267

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