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Journal of Arid Land
Journal of Arid Land  2017, Vol. 9 Issue (1): 98-108    DOI: 10.1007/s40333-016-0095-7
Orginal Article     
Groundwater evapotranspiration under psammophilous vegetation covers in the Mu Us northern China
Donghui CHENG1 *(), Jibo DUAN1, Kang QIAN1, Lijun QI1, Hongbin Yang1, Xunhong CHEN2?
1School of Environmental Sciences and Engineering, Chang’an University, Xi’an 710054, China
2School of Nature Resources, University of Nebraska-Lincoln, NE68583-0996, USA
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Abstract  

Groundwater is a significant component of the hydrological cycle in arid and semi-arid areas. Its evapotranspiration is an important part of the water budget because many plants are groundwater-dependent. To restore the degraded ecosystems, the need is pressing to further our understanding of the groundwater evapotranspiration (ETg) in arid and semi-arid areas. This study employed the White method to estimate ETgat four sites in the Mu Us Sandy Land in northern China, and the four sites are covered by Salix psammophila(SP site), Artemisia ordosica(AO site), Poplar alba (PA site), and Carexenervis(CE site), respectively. The depth of groundwater table and the duration of drainage were taken into account in calculating the specific yield (Sy) to improve the accuracy of the ETgestimats. Our results showed that from late May to early November 2013 the ETg were 361.87 (SP site), 372.53 (AO site), 597.86 (PA site) and 700.76 mm (CE site), respectively. The estimated ETg rate was also species-dependent and the descending order of the ETg rate for the four vegetation was: C. enervis, P. alba, A. ordosica, and S. psammophila. In addition, the depth of groundwater table has an obvious effect on the ETg rate and the effect varied with the vegetation types. Furthermore, the evapotranspiration for the vegetation solely relying on the water supply from unsaturated layers above the groundwater table was much less than that for the vegetation heavily relying on the water supply from shallow aquifers.

Key words： groundwater evapotranspiration      White method      specific yield      psammophilous vegetation      Mu Us Sandy Land     
Received: 15 September 2015      Published: 31 July 2017
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Donghui CHENG
Jibo DUAN
Kang QIAN
Lijun QI
Hongbin Yang
Xunhong CHEN
Cite this article:

Donghui CHENG, Jibo DUAN, Kang QIAN, Lijun QI, Hongbin Yang, Xunhong CHEN. Groundwater evapotranspiration under psammophilous vegetation covers in the Mu Us northern China. Journal of Arid Land, 2017, 9(1): 98-108.

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http://jal.xjegi.com/10.1007/s40333-016-0095-7     OR     http://jal.xjegi.com/Y2017/V9/I1/98

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