| 生物土壤与生态 |
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| Water Relations of Different Parts of Artemisia ordosica |
LI Xiao-jun1,2, TAN Hui-juan1,2, ZHANG Zhi-shan1, LI Xin-rong1
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| 1.Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental & Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate School of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Water parameters of different parts (reproductive shoot, vegetative shoot, annual tress, biennial tress, trunk, roots) of Artemisia ordosica and their roles in water transfer of SPAC system were studied by using the plant pressure-volume technique. The results showed that different parts of Artemisia ordosica had the similar water physiology, but significant differences existed among these parameters. With the increase of lignification, the maximum osmotic potential at saturated point(Ψ100π), osmotic potential (Ψ0), relative water deficit (D0RW), relative osmotic water deficit at turgor loss point(D0ROW), bound water content(Vb) and bulk elastic modulus(εmax) of the tress (except for reproductive shoots) all increased, while free water content(Vf) decreased. The Ψ100π, Ψ0, D0RWand D0ROW of the reproductive shoot were higher than that of the other kinds of tress; the Ψ100π, Ψ0, D0RW, D0ROW, Vb and εmax of the root were higher than that of any kind of tress, while Vf and (ΔΨ of the root were lower than that of tress. In addition, the total hydraulic capacitance(C) of tress generally decreased with the increase of lignification, but for details, there were no obvious differences among different kinds of tress before turgor loss and gradually decreased after turgor loss. As a whole, the C of reproductive shoot was higher than that of other tress, and the C of root was the highest one. Under the condition of drought, new tress tended to lose its water and to keep low water potential and turgor because of its low bound water content, low bulk modulous and high hydraulic capacitance; while old tress could hold their water because of their high bound water content, stiffer and thicker cell wall. The root was characterized by high free water content and hydraulic capacitance, which showed a property of being prone to lose water easily and was beneficial to the water transfer in SPAC system.
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Received: 01 January 2006
Published: 20 May 2007
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2007, Vol. 27 
