| Biology and Soil |
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| Analysis on the Factors Influencing Moisture Change in Broad-ovate Leaves of Populus euphratica Oliv. in Extremely Arid Region |
| FU Ai-hong, LI Wei-hong, CHEN Ya-ning, CHEN Ya-peng, MA Jian-xin |
| State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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Abstract The main object of this paper was to analyze the factors influencing moisture change in broad-ovate leaves of Populus euphratica Oliv. under the extremely arid environment distributed in the lower reaches of the Tarim River in Xinjiang, China. Measurements were conducted on gas exchange and water potential of P. euphratica leaf, climate factors and soil water and salt content. Results showed that: (1) the primary factors influencing moisture change in P. euphratica leaf in the extremely arid zone were climate factors, such as air relative humidity, air temperature, etc.; (2) air relative humidity of (48.19±1.06)% was a critical threshold value influencing the growth of P. euphratica leaf, but was not the indicating index reflecting the moisture state of P. euphratica. When relative humidity was from 10.69% to 48.19%, the gas exchange and growth of P. euphratica leaf were good in the lower reaches of Tarim River. This study will provide the theoretical basis on alleviating drought stress and maintaining the natural growth of Populus euphratica.
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Received: 17 May 2011
Published: 20 January 2012
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2012, Vol. 32 
