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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (5): 729-740.doi: 10.7525/j.issn.1673-5102.2023.05.010

• Physiology and Ecology • Previous Articles     Next Articles

Response of leaf Hydraulic Traits of Typha orientalis to Simulated Warming and Elevated CO2 Concentration

Hangmei YANG1,2, Liping LI1,2, Mei SUN1,2(), Hongyi CHEN1,2, Lingyan LI3, Chunhui FENG2   

  1. 1.Yunnan Key Laboratory of Plateau Wetland Conservation,Restoration and Ecological Services,Southwest Forestry University,Kunming 650224
    2.National Plateau Wetlands Research Center,Southwest Forestry University,Kunming 650224
    3.Lianghe County Forestry and Grassland Bureau,Dehong 678400
  • Received:2023-04-13 Online:2023-09-20 Published:2023-09-05
  • Contact: Mei SUN E-mail:sm0510215@163.com
  • About author:YANG Hangmei(1998—),female,postgraduate,research direction is Wetland Ecology.
  • Supported by:
    Yunnan Provincial Science and Technology Department of Agriculture Joint Special Project(202101BD070001-099);National Natural Science Foundation of China Regional Foundation Project(31760115);Open Fund Project of Yunnan Key Laboratory of Plateau Wetland Conservation,Restoration and Ecological Services(202105AG070002)


In order to explore the response strategies of plateau wetland plants to increasing temperature and CO2 concentration, Typha orientalis, a common emergent plant in plateau areas, was selected as the research object to detect its leaf functional traits, and the simulated climatic change of increasing 2 ℃ temperature and CO2 concentration doubling were designed by constructing a capping artificial growth chamber. The results showed that: (1)The net photosynthetic rate, stomatal conductance, intercellular CO2 molar fraction and transpiration rate of T. orientalis under the CO2 concentration doubling treatment were significantly reduced (P<0.05); while the net photosynthetic rate and stomatal conductance of T. orientalis were also significantly reduced under the warming treatment(P<0.05) compared with the control group. The results indicated that the photosynthetic carbon assimilation capacity of T. orientalis was significantly reduced under the temperature increasing and CO2 concentration doubling conditions(P<0.05). (2)The vein density of T. orientalis leaves increased significantly under the CO2 concentration doubling treatment; while the vein density and stomatal density increased significantly, but the vascular bundle area and catheter area decreased significantly(P<0.05) under the warming treatment compared with the control group. The results reflected the enhancement of water transport and transpiration loss capacity but the reducing of water use efficiency of T. orientalis under the conditions of warming and CO2 concentration increasing. (3)The correlations among leaf photosynthetic parameters were looser, while the correlations between net photosynthetic rate and leaf structure traits were stronger under warming and CO2 concentration doubling treatments than control group. The results showed that the functional synergistic or trade-off effects of leaf functional traits of T. orientalis were enhanced significantly by increasing temperature and CO2 concentration.

Key words: plateau wetland, temperature increasing, CO2 concentration increasing, plant functional traits, Typha orientalis, hydraulic balance

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