植物生态学报 ›› 2015, Vol. 39 ›› Issue (6): 593-603.doi: 10.17521/cjpe.2015.0057

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玛曲高寒沼泽化草甸51种植物光合生理和叶片形态特征的比较

任青吉1, 李宏林2,*(), 卜海燕2   

  1. 1甘南州草原工作站, 甘肃合作 747000
    2兰州大学生命科学学院草地农业生态系统国家重点实验室, 兰州 730000
  • 收稿日期:2015-03-03 接受日期:2015-04-14 出版日期:2015-06-01 发布日期:2015-07-02
  • 通讯作者: 李宏林 E-mail:lihl2009@lzu.edu.cn
  • 作者简介:

    *作者简介: E-mail:tanzh@xtbg.ac.cn

  • 基金资助:
    基金项目 国家自然科学基金(41171046和41171214)和霍英东教育基金(132038)

Comparison of physiological and leaf morphological traits for photosynthesis of the 51 plant species in the Maqu alpine swamp meadow

REN Qing-Ji1, LI Hong-Lin2,*(), BU Hai-Yan2   

  1. 1Grassland Workstation of Tibetan Autonomous Prefecture of Gannan, Hezuo, Gansu 747000, China
    2State Key Laboratory of Grassland Agro- ecosystems, School of Life Science, Lanzhou University, Lanzhou 730000, China
  • Received:2015-03-03 Accepted:2015-04-14 Online:2015-06-01 Published:2015-07-02
  • Contact: Hong-Lin LI E-mail:lihl2009@lzu.edu.cn
  • About author:

    # Co-first authors

摘要:

基于功能性状的研究方法广泛地应用于生态学研究, 用于解释不同层次的复杂的生态学过程, 而绿色植物叶片的功能性状长期被认为对植物的生存、生长和繁殖具有重要的影响。该研究对玛曲高寒沼泽化草甸51个植物种(分属于14科)的叶片形态和光合性状进行测量, 比较不同物种和不同功能群(莎草科、禾本科和双子叶类杂草)的差异, 分析叶片形态特征和叶片光合性状之间的相关性。结果表明: 1)不同物种、不同功能群之间在比叶面积、净光合速率和水分利用效率等叶片形态和光合特征方面有着显著的差异, 例如禾本科植物具有较高的比叶面积和水分利用效率, 双子叶类杂草具有较大的叶面积, 而莎草科植物具有较高的净光合速率。2)相关性分析结果显示, 无论在物种水平还是功能群水平, 叶片形态和叶片光合性状之间都具有显著的相关关系。该研究揭示了高寒沼泽化草甸植物物种在叶片功能性状上的显著分化, 进而使得这些物种能在同一个草地群落中共存, 而群落中不同功能群物种的组成差异将会对群落的结构、功能和资源利用产生显著的影响。该研究将为进一步研究高寒沼泽化草甸提供基础研究数据并为其保护和恢复提供生理生态学依据。

关键词: 高寒沼泽化草甸, 功能性状, 叶片形态特征, 光合生理特征, 水分利用效率, 功能群

Abstract:
Aims Trait-based approaches are often widely used in ecological research to predict or explain the complex ecological processes at both individual and ecosystem levels. Leaf function with morphological and physiological traits can play important roles in plan growth, survival, reproduction in natural environments. The aim of this study is 1) to determine the differences of leaf traits between both the species and the functional groups in a swamp meadow; 2) to explore the relationship between different leaf morphological traits and physiological traits.
Methods Gas exchanges of 51 species (in 14 families) were measured on six fully expand health leaves (from different individual plants) using a portable photosynthesis system in the field during the peak of growing season. The leaf morphological traits was measured based on 6 single leaves form different individuals, include the net photosynthesis rate (Pn), transpiration rate (Tr), specific leaf area (SLA), relative leaf water content (LWC), leaf area (LA) and the water use efficiency (WUE = Pn/Tr).
Important findings Result showed that there were significant interspecific differences in the investigated traits as described in above methods. Among the traits, the LWC (coefficient of variation, CV = 0.11) was ranged from 58.12% to 81.83%, 0.0088-0.0278 m2·g-1 for the SLA (CV = 0.27), and 0.51 cm2 to 100.90 cm2 for the LA (CV = 1.73), while the range of 4.25-19.23 μmol CO2·m-2·s-1, 2.89-12.81 mmol H2O·m-2·s-1 and 0.56-3.76 μmol CO2·mmol-1 H2O for Pn (CV = 0.33), Tr (CV = 0.33), and WUE (CV = 0.36), respectively. There were also significant differences between the functional groups (sedge, grass and forbs) for these traits. Forbs have larger LA and higher LWC than sedge and grass; Grass have higher WUE and SLA than those of others; while Sedge have higher Pn. Our result also showed there were high correlation between Pn and SLA, WUE and LWC, indicated the strong impacts of leaf morphology on the gas exchange physiology. The SLA was also related to gas exchange traits both among species and functional groups, while the LWC was only among species and LA among functional groups. In conclusion, significant differences in these functional traits among species suggest that these species could vary in resource use and growth form in their community ecosystem. Also the difference among the functional groups in these traits indicates the resource use of the community would be largely influenced by its species composition, especially the differences of functional groups. The research finding will help to better understanding of the ecosystem function in alpine swamp meadow with related management implication.

Key words: alpine swamp meadow, functional traits, leaf morphology, gas exchange, water use efficiency, functional group