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| Effects of Irrigations on Photosynthetic Characteristic and Water Use Efficiency of Calligonum mongolicum and Hedysarum scoparium |
| Guo Zichun1,2, Zeng Fanjiang1, Liu Bo1, Luo Weicheng1, Song Cong1, Wang Huiti1, Guo Jingheng1 |
1. Cele National Field Science Observation and Research Station of Desert Grassland Ecosystem/Key Laboratory of Biogeography and Bioresource in Arid land/State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academic of Sciences, Uruiqi 830011;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Field experiment on the photosynthetic characteristic and water use efficiency of two kinds of desert shrubs was carried out under different irrigation amounts. The results showed that: (1) with increasing irrigation amounts, the photosynthetic rate of Calligonum mongolicum and Hedysarum scoparium increased, whereas the transpiration rate(Tr), stomata conductance(Gs) and intercellular CO2 concentration(Ci) did not alter notably. (2) the irrigation increased the predawn and midday water potential of the C. mongolicum, and only the midday water potential had a notable difference under the conditions between the irrigation and no irrigation(p<0.05), while only the midday water potential of the H. scoparium increased with increasing irrigation, and the difference between the sufficient irrigation and no irrigation is only distinct(p<0.05). (3) the δ13C did has little change under the conditions between the different irrigation conditions, the δ13C average value of C. mongolicum was -12.267, -12.147 and -11.958 respectively in the no irrigation, moderate irrigation and sufficient irrigation, while the δ13C average value of H. scoparium was -27.928、-28.068、-27.166, respectively. (4) the water use efficiency of no irrigation of C. mongolicum and H. scoparium was obviously higher than that of the irrigation. Moreover, one time irrigation did not alter their water use efficiency.
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Received: 27 January 2013
Published: 20 March 2014
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Corresponding Authors:
曾凡江（Email：fjzeng369@sohu.com）
E-mail: fjzeng369@sohu.com
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2014, Vol. 34 
