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Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (5): 1024-1032.DOI: 10.7522/j.issn.1000-694X.2017.00015

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Water Sources of Dominant Plants in Haloxylon ammodendron Community at the Southern Edge of Gurbantunggut Desert

Fu Sihua1,2, Hu Shunjun1, Li Hao1,2, Wang Zefeng1,2   

  1. 1. State Key Laboratory of Desert and Oasis, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-12-11 Revised:2017-03-07 Online:2018-09-20 Published:2018-11-03

Abstract: In order to research the desert plant water use pattern and their mutual influence in arid regions. Five dominant desert plants, Haloxylon ammodendron, Erodium oxyrrhynchum, Sisymbrium polymorphum, Seriphidium santolinum and Suaeda glauca were selected in May 2016 at the southern edge of Gurbantunggut Desert. The oxygen sable isotope ratios (δ18O) of xylem water and soil water were measured by stable isotope technique. To investigate the dynamics of water usage of these plants, we used the direct comparison method, Iso-Source model and the mean depth of water uptake model. The results showed that there is dimorphism in H. ammodendron root. In May, the main water sources of H. ammodendron were shallow soil water (20-40 cm), deep soil water (100-350 cm), and groundwater. While in August, H. ammodendron tended to use deep soil water (160-350 cm), and groundwater. The main water sources of Erodium oxyrrhynchum, Sisymbrium polymorphum, Seriphidium santolinum and Suaeda glauca concentrated in the 8-65 cm lay soil water. The seasonal variation of soil water use pattern of Seriphidium santolinum and Suaeda glauca was obvious. Sisymbrium polymorphum, Seriphidium santolinum and Suaeda glauca under the canopy had a competition about soil moisture, while the plants outside the canopy had no competition.

Key words: Gurbantunggut Desert, water sources, stable isotope, dimorphism, competition

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