| 干旱胁迫对竹柳光合特性的影响 |
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| 引用本文： | 宋学贵,;王彬,;周光良,;胡红玲.干旱胁迫对竹柳光合特性的影响[J].四川林业科技,2014(5):40-44. |
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| 作者姓名： | 宋学贵 ;王彬 ;周光良 ;胡红玲 |
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| 作者单位： | [1]眉山市林业局,四川眉山620010; [2]四川农业大学林学院,四川雅安625014 |
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| 摘 要： | 采用盆栽控水的方法,设置5个处理对竹柳幼树进行干旱胁迫实验(分别为浇水到土壤田间持水量的80%后,依次停水16 d、12 d、8 d、4 d和0 d),分析了竹柳在不同干旱胁迫处理下的光合指标,并探讨了胁迫结束后复水对竹柳光合指标的影响。结果表明:(1)随干旱胁迫强度的增大,竹柳的净光合速率(Pn)显著降低(P0.05),气孔导度(Gs)和蒸腾速率(Tr)总体上呈下降趋势,胞间二氧化碳浓度(Ci)先降低后升高;(2)对胁迫后的竹柳恢复浇水,竹柳的净光合速率(Pn)、气孔导度(Gs)、胞间二氧化碳浓度(Ci)和蒸腾速率(Tr)显著增加;(3)竹柳通过叶片变黄,萎蔫卷曲,干枯脱落,顶芽萎蔫下垂的避旱策略来应对干旱胁迫。
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| 关 键 词： | 竹柳 干旱胁迫 复水 光合特性 |
Influcnces of Drought Stress on Photosynthetic Characteristics of Fragile Willow |
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| Institution: | SONG Xue-gui, WANG Bin, ZHOU Guang-liang, HU Hong-lin (1. Forest Bureau of Meishan District,Meishan 620010,China; 2. Forestry College of Sichuan Agricultural University,Ya＇an 625014,China) |
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| Abstract: | Pot experiments were conducted with 5 watering treatments （watering to 80% field capacity, then stopping watering,followed by drought stress of 16 days,12 days,8 days,4 days and 0 day） on fragile willow saplings. Photosynthetic indicators of fragile willow were determined and analyzed under different drought stress. And the change of photosynthetic indicators of fragile willow after re-watering were observed. The results showed as follows：l ） with the increase of drought stress, the net photosynthetic rate （Pn） of fragile willow saplings decreased significantly,stomatal conductance （Gs） and transpiration rate （Tr） overall decreased,and intercellular CO2 concentration （Ci） decreased at first and then increased. 2） After re -watering the sapling for 72 and 120 hours, the net photosynthetic rate （Pn）, stomatal conductance （Gs）, the intercellular CO2 concentration （Ci） and the transpiration rate （Tr） increased significantly. 3） Fragile willow adopted such a drought avoidance strategy as turning yellow, wilting, curling and drying Key w off of leaves and wilting and sagging of terminal buds to cope with drought stress. |
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| Keywords: | Fragile wiUow（ Salix fragilis L ） Drought stress Re-water Photosynthetic Characteristics |
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