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草业学报 ›› 2009, Vol. 18 ›› Issue (5): 25-30.

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苏打盐碱胁迫对羊草光合、蒸腾速率及水分利用效率的影响

黄立华1,2,梁正伟1,2*,马红媛1,2   

  1. 1.中国科学院东北地理与农业生态研究所,吉林 长春 130012;
    2.中国大安碱地生态试验站,吉林 大安 131317
  • 收稿日期:2008-12-07 出版日期:2009-10-20 发布日期:2009-10-20
  • 作者简介::黄立华(1974-),男,吉林梨树人,助研,博士。E-mail: huanglihua@neigae.ac.cn
  • 基金资助:
    国家科技部973项目(2007CB106800),国家科技支撑重大项目(2006BAC01A08),中国科学院知识创新工程前沿领域项目(KZCX3-SW-NA3-05)和中国科学院西部行动计划项目(KZCX2-XB2-13)资助。

Effects of saline-sodic stress on the photosynthesis rate, transpiration rate and water use efficiency of Leymus chinensis

HUANG Li-hua1,2, LIANG Zheng-wei1,2, MA Hong-yuan1,2   

  1. 1.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences,
    Changchun 130012, China;
    2.Da’an Sodic Land Experiment Station, Da’an 131317, China
  • Received:2008-12-07 Online:2009-10-20 Published:2009-10-20

摘要: 采用温室土培试验法,研究了羊草叶片光合速率、蒸腾速率和水分利用效率等对不同苏打盐碱胁迫的响应特征。结果表明,随着模拟光辐射的增强,羊草叶片光合速率、蒸腾速率、气孔导度和蒸汽压亏缺等表现为升高,胞间CO2浓度表现为降低,叶片水分利用效率则呈先升高后降低的趋势。同一光强下,随着土壤苏打盐碱胁迫程度的增大,羊草光合速率和蒸腾速率均有所下降,水分利用效率则有所升高。以光强1 500 μmol/(m2·s)为例,pH 9.78的盐碱胁迫处理的羊草光合速率和蒸腾速率分别比对照(pH 7.15)的处理降低了43.8%和51.3%。苏打盐碱胁迫下,羊草蒸腾速率的降低幅度大于光合速率降低幅度,保持了叶片较高的水分利用效率,可能是羊草适应苏打盐碱逆境的重要生理机制。

Abstract: Changes of photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) of L. chinensis were investigated under different saline-sodic stress conditions by culturing in soils of five pH values. Pn, Tr, Gs and VpdL increased and Ci decreased with increased simulated photosynthetic radiation, while the WUE first increased, then decreased. Under the same simulated photosynthetic radiation, Pn and Tr decreased and WUE increased as saline-sodic stress increased. For example, when the simulated photosynthetic radiation was 1 500 μmol/m2·s, Pn and Tr of L. chinensis growing at pH 9.78 saline-sodic stress were reduced 43.8% and 51.3% respectively compared with those of the CK (pH 7.15). Under saline-sodic stress, L. chinensis has a higher water use efficiency (WUE) since Tr is reduced more than Pn. This could be an important physiological mechanism of saline-sodic tolerance of L. chinensis.

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