| Biology and Soil |
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| Determination of Water Sources of Gobi Plants by D and 18O Stable Isotopes in Middle Reaches of the Heihe River |
| YU Shao-wen1, SUN Zi-yong2,3, ZHOU Ai-guo2, ZHANG Xi4, DUAN Li-jun4, XU Shu-gang4 |
1.Wuhan Centre of China Geological Survey, Wuhan 430205, China;
2.School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;
3.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
4.Graduate School, China University of Geosciences, Wuhan 430074, China |
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Abstract The δD and δ18O values of rainfall, groundwater, soil water and water extracted from two Gobi plants were measured to analyze the sources of soil water at different depths in the Gobi area in Linze in the middle reaches of Heihe River, and to determine the soil layer in which two Gobi plants extract water and their dependence on rainfall and groundwater. Results show that: (1) Soil water at the layer above 130 cm in depth are mainly recharged by rainfall, and that below 130 cm are recharged by evaporation of phreatic water or the infiltration of earlier heavy rainfall; (2) δD and δ18O values of soil water decline with soil depth, and there is a typical exponential relation, and δD and δ18O values of soil water are influenced by both current soil water and infiltration of rainfall; and (3) Nitraria sphaerocarpa and Reaumuria soongorica extract soil water below the depth of 185 cm, but Nitraria sphaerocarpa extracts deeper soil water than Reaumuria soongorica does, which indicate that the growth of desert plants mainly rely on phreatic water which is more stably available.
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Received: 23 October 2011
Published: 20 May 2012
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2012, Vol. 32 
