| Biology and Soil |
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| Adaptation of Apocynum venetum to Saline Water Irrigation |
| HAN Wei1,2, CAO Ling2, Hamid·Yimit1, XU Xin-wen2 |
1.College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China;
2.College of Mathematics and Physics Sciences, Xinjiang Agricultural University, Urumqi 830052, China;
3.College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China;
4.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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Abstract The responses of chlorophyll fluorescence, leaf water potential and growth rate of Apocynum venetum seedlings to different saline water irrigation treatments were investigated. With the increase of saline water concentration, the leaf's chlorophyll content drops firstly and then increases, but the leaf water potential maintains stable basically; The absorption, assignment and dissipation of light energy reach equilibrium at saline water concentration of 10 g·L-1, and the growth rate of Apocynum venetum seedlings also reaches the highest value of 9.8 mm·d-1 at saline water concentration of 10 g·L-1. Along with the stress process extending, the greatest quantum yield Fv/Fm drops, and the absorption of metallic ion from the solution increases. In the 21st day after saline water irrigation, the non-photochemical quenching coefficient (NPQ) presents the maximum value; the energy absorption proportion parameter Y(Ⅱ) drops firstly and then restores again; the proportion of energy absorption to energy assignment and to energy dissipation parameters stabilizes at Y(Ⅱ):Y(NO):Y(NPQ) = 65%∶20%∶15% at saline water concentration of 10 g·L-1. In the A. venetum nursery process in the southern edge of the Taklimakan Desert, phase-difference nursing strategy should be adopted according to different seedling stage: 5~10 g·L-1 saline water should be used in irrigation in the seedling stage to maintain a higher leaf water potential, which could prevent the decomposition of chlorophyll. Besides, the 10 g·L-1 salt water irrigation treatment could maintain higher proportion of photochemical energy conversion, which is helpful to the restoration and construction of oasis-desert ecotone in southern margin of the Taklimakan Desert.
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Received: 16 September 2011
Published: 20 May 2012
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2012, Vol. 32 
