草地学报

›› 2004, Vol. 12 ›› Issue (2): 103-106.DOI: 10.11733/j.issn.1007-0435.2004.02.006

• 研究论文 • 上一篇    下一篇

地毯草营养枝与生殖枝光合生理特性研究

郭力华1,2, 王立2, 刘金祥3, 杨允菲2   

  1. 1. 海南师范学院生物系, 海口, 571158;
    2. 东北师范大学草地研究所, 植被生态科学教育部重点实验室, 长春, 130024;
    3. 湛江师范学院生物系, 湛江, 524048
  • 收稿日期:2003-11-20 修回日期:2004-02-18 出版日期:2004-05-15 发布日期:2004-05-15
  • 通讯作者: 杨允菲,E-mail:yangyf@nenu.edu.cn
  • 作者简介:郭力华(1963- ),女,吉林人,副教授,博士研究生,E-mail:balancing@vip.163.com
  • 基金资助:
    国家自然科学基金项目(30070137)

A Study on Photosynthetic Physiological Characters of Vegetative and Reproductive Tillers of Axonopus Compressus

GUO Li-hua1,2, WANG Li2, LIU Jin-xiang3, YANG Yun-fei2   

  1. 1. Department of Biology, Hainan Normal University, Haikou, Hainan Province 571158, China;
    2. Institute of Grassland Science, Northeast Normal University, Key aboratory for Vegetation, Changchun, Jilin Province 130024, China;
    3. Department of Biology, Zhanjiang Normal College, Zhanjiang, Guangdong Province 524028, China
  • Received:2003-11-20 Revised:2004-02-18 Online:2004-05-15 Published:2004-05-15

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摘要： 研究地毯草营养枝与生殖枝的光合生理特性。结果表明:前者叶片的光合及水分利用效率均高于后者,而呼吸速率和光补偿点低则低于后者,其中生殖枝基部叶片光合能力较弱,呼吸强度居于营养枝与生殖枝旗叶之间;地毯草表观光量子效率高于一般植物,适合阴生环境条件;营养枝和生殖枝的叶面饱和水汽压亏缺是通过气孔导度对蒸腾速率所引起的水分散失进行反馈调节,在强光下气孔导度逐渐下降,但蒸腾速率和叶面饱和水汽压亏缺始终保持线性增加趋势,缺乏保水机制,更适合水分充足的环境条件。

关键词: 草原学, 毯草, 营养枝, 生殖枝, 构件, 光合生理, 草坪植物

Abstract: A study on the photosynthetic physiological characters of the vegetative tillers and reproductive tillers of Axonopus compressus reveal that the net photosynthetic rate (Pn) and the water use efficiency (WUE) of the former are higher than those of the latter, while the respiration rate and the light compensation point (LCP)of the reproductive tillers are higher than those of vegetative tillers. Moreover, the reproductive tillers’ basal leaves are weak in photosynthetic capacity and their respiratory intensity is intermediate-stronger than that of the vegetative tillers but weaker than the respiratory intensity of the flag leaves of the reproductive tillers. As the apparent quantum yield (AQY) of modules of the two tillers of Axonopus compressus are higher than those of plants in general, the lawn grass thrives in the dim light and adapts itself to a shady habitat. The vapor pressure deficit (VID) of leaves is mended through the stomatal conductance(Gs) to modulate the loss of water by the feedback of transpiration(Tr).in the intense light, the stomatal conductance of modules of the two tillers descend gradually, but their transpiration rate and vapor pressure deficit continue to increase linearly. The fact shows that Axonopus compressus lacks a water-retaining machanism and is more adaptable to a water-saturated habitat.

Key words: Grassland science, Axonopus compressus, Vegetative tiller, Reproductive tiller, Module, Photosynthetic physiology, Lawn

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