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草业学报 ›› 2011, Vol. 20 ›› Issue (5): 49-56.

• 研究论文 • 上一篇    下一篇

不同盐碱化草地对披碱草光合生理特性的影响

杜利霞1,董宽虎1*,杨桂英1,陈立坤2,夏方山1,董秋丽1   

  1. 1.山西农业大学动物科技学院,山西 太谷 030801;
    2.四川省草原科学研究院,四川 成都 611731
  • 出版日期:2011-10-20 发布日期:2011-10-20
  • 通讯作者: E-mail:dongkuanhu@126.com
  • 作者简介:杜利霞(1978-),女,内蒙古武川人,讲师,在读博士。
  • 基金资助:
    国家“十一五”科技支撑计划课题(2007BAD56B01)资助。

Effects of different saline-alkali grassland on the photosynthetic physiological characteristics of Elymus dahuricus

DU Li-xia1, DONG Kuan-hu1, YANG Gui-ying1, CHEN Li-kun2, XIA Fang-shan1, DONG Qiu-li1   

  1. 1.College of Animal Science and Technology, Shanxi Agricultural University, Taigu 030801, China;
    2.Sichuan Academy of Grassland Science, Chengdu 611731, China
  • Online:2011-10-20 Published:2011-10-20

摘要: 用CI-340光合测定系统对不同盐碱化草地上的披碱草进行光合特性的测定,并在室内对脯氨酸、丙二醛、可溶性糖的含量进行了研究,以探讨披碱草的耐盐碱能力。结果显示,披碱草的净光合速率随着盐碱化程度的增加在降低,气孔导度、蒸腾速率、胞间CO2浓度也在下降;轻度区和中度区的净光合速率在7月份最大,重度区净光合速率在8月份最大,不同月份和不同盐碱化草地披碱草的光合速率受气孔限制和非气孔限制双重影响。丙二醛、脯氨酸和可溶性糖都是随着盐碱化程度的增加在增大。丙二醛的含量在苗期最高,随着植物的生长,含量降低;脯氨酸和可溶性糖含量在苗期和抽穗期较高,这样可以减缓盐胁迫对幼苗造成的伤害。

Abstract: The photosynthetic characteristics (using the CI-340 photosynthesis mensurate system) and other physiological indexes of Elymus dahuricus under different saline-alkaline grassland conditions were determined at different growth stages. With an increase of saline-alkaline concentration, the net photosynthetic rate, transpiration rate, stomatic conductance and intercellular CO2 concentration decreased. Net photosynthetic rate at light (L) and moderate (M) salinity was the largest in July, but the largest net photosynthesis at high (H) salinity was in August. At different months and different saline-alkaline grassland conditions, net photosynthesis was affected by both stomatal limitations and non-stomatal limitations. The content of soluble sugar, MDA and Pro all increased with increased saline-alkaline conditions. MDA content was largest at the seedling stage, but it reduced with the growth of E. dahuricus. The increase of Pro and soluble sugars of E. dahuricus at the seedling and heading stages can reduce seedling damage from salt stress.

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