| 生物土壤与生态 |
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| Vegetation Coverage and Its Relation with Climate Change in Qinghai Lake Area |
Chen Xiao-guang1, Li Jian-ping1, Li Zhi-jun2, Han Ying-juan1, Chen Bao-de3
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| 1.Key Laboratory of Meteorological Disaster Prevention of Mitigation of Ningxia, Yinchuan, 750002, China; 2.Ningxia Meteorological Bureau, Yinchuan 750002, China; 3.SAIC/NASA/Global Modeling and Assimilation Office, Shanghai 200030, China |
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Abstract Based on the monthly AVHRR NDVI (Normalized Difference Vegetation Index) data during 1981—2003, the change of vegetation fraction in the Qinghai lake area and its relation with temperature and precipitation evolution were studied. It was found that the vegetation fraction anomaly generally showed an increasing trend, particularly, the anomaly was positive and the annual mean increment was about 1.07×10-3 from 1996 to 2003. In the recent 23 years, the seasonal vegetation fractions also showed increasing trend and the largest trend was in summer. Furthermore, the monthly mean temperature showed a marked positive correlation with the monthly vegetation fraction; spring and summer precipitation also showed a marked positive correlation with summer and autumn vegetation fraction. Therefore it is deduced that the quantity of heat and precipitation of spring and summer are key factors impacting vegetation growth.
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Received: 13 June 2006
Published: 20 September 2007
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2007, Vol. 27 
