| 生物土壤与生态 |
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| Responses of Calligonum arborescens Photosynthesis to Water Stress in Tarim Highway Shelterbelt |
YAN Hai-long1,2, ZHANG Xi-ming1, XU Hao1,2, YAO Shi-jun1,2
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| 1.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011, China; 2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract Tarim highway is the longest high-grade desert road in the world. Shelterbelt was used to avoid moving sand and blowing wind along the Tarim highway. Calligonum arborescens is one of the important desert species in configuration of the shelterbelt. With the Li-6400 system we measured the diurnal change of net photosynthesis, transpiration and water use efficiency of Calligonum arborescens in different seasons under treatments of drought and irrigation. The following results have been obtained: ①The diurnal changes of photosynthesis rates of Calligonum arborescens under the two treatments were unimodal curves in different seasons, and that of transpiration rates were unimodal curves except the drought treatment in August. ②Drought stress could reduce the rates of photosynthesis and transpiration of Calligonum arborescens remarkably, and the influence would enhance with the continuance of drought stress treatment. ③Because of drought, the soil water content and plant water decreased, but the decrease didn't improve the water use efficiency of Calligonum arborescens. Nevertheless, Calligonum arborescens could live and grow in the very drought environment due to elementary accumulation of photosynthetic production through ways of reducing the respiration and the light compensation point, etc. The desert species, Calligonum arborescens, has strong ability to endure drought and adapt the most rigorous environment, which imply the possibility of saving water further in the management of shelterbelt along the desert high way.
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Received: 12 December 2005
Published: 20 May 2007
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2007, Vol. 27 
