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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (2): 574-582    DOI: 10.7522/j.issn.1000-694X.2013.00079
    
Response of NDVI to Groundwater Level Change in the Lower Reaches of the Heihe River, China
XI Hai-yang, FENG Qi, SI Jian-hua, CHANG Zong-qiang, SU Yong-hong
Alxa Desert Eco-hydrology Experimental Research Station/Gansu Hydrology and Water Resources Engineering Research Center, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

The core oasis in the lower reaches of Heihe River is selected as a study area. Through long-term monitoring the oasis vegetation change and the oasis groundwater level, the relationship of vegetation cover and the groundwater level in the lower reaches of Heihe River oasis is analysed. The surface analysis and spatial analysis methods are used to discuss how the groundwater level change influenced the distribution pattern of the oasis vegetation. Results showed that NDVI values in 2009 were wholelly smaller than in 1990 in the lower reaches of Heihe River. The vegetation growth in 2009 as a whole was worse than in 1990. The local NDVI values near river increased in 2009, but most of the NDVI values were still less than in 1990. Compared with that in 2001, the vegetation near West River upper and mid reaches significantly improved in 2009, but the vegetation in West River lower reaches still showed a degradation trend. The vegetation cover near upper reaches of East River presented significant improvement, vegetation cover changed little in the mid reaches of East River, vegetation cover area showed a slight increase in the lower reaches of East River, but vegetation cover had not yet reached the level in 2001. The vegetation cover surrounding East Juyanhai Lake in 2009 was better than in 2001. Comparison of the relationship between groundwater depth and vegetation cover in 1990, 2001 and 2009 showed that the suitable groundwater depth for vegetation was still at 2-4 m. There were direct relations between groundwater level falling and vegetation degradation.

Key words:  the lower reaches of Heihe River      oasis vegetation      groundwater      response     
Received:  03 May 2012      Published:  10 July 2012
ZTFLH:  Q948.2  

Cite this article: 

XI Hai-yang, FENG Qi, SI Jian-hua, CHANG Zong-qiang, SU Yong-hong. Response of NDVI to Groundwater Level Change in the Lower Reaches of the Heihe River, China. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 574-582.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00079     OR     http://www.desert.ac.cn/EN/Y2013/V33/I2/574

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