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植物研究 ›› 2023, Vol. 43 ›› Issue (5): 729-740.doi: 10.7525/j.issn.1673-5102.2023.05.010

• 生理与生态 • 上一篇    下一篇

香蒲叶功能性状对模拟增温和CO2浓度倍增的响应

杨航美1,2, 李丽萍1,2, 孙梅1,2(), 陈弘毅1,2, 李玲艳3, 冯春慧2   

  1. 1.西南林业大学,云南省高原湿地保护修复与生态服务重点实验室,昆明 650224
    2.西南林业大学,国家高原湿地研究中心,昆明 650224
    3.梁河县林业和草原局,德宏 678400
  • 收稿日期:2023-04-13 出版日期:2023-09-20 发布日期:2023-09-05
  • 通讯作者: 孙梅 E-mail:sm0510215@163.com
  • 作者简介:杨航美(1998—),女,硕士研究生,主要从事湿地生态学方面的研究。
  • 基金资助:
    云南省科技厅农业联合专项面上项目(202101BD070001-099);国家自然科学基金地区基金项目(31760115);云南省高原湿地保护修复与生态服务重点实验室(培育)开放基金(202105AG070002)

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)

摘要:

为探讨高原湿地植物对增温和CO2浓度升高的响应策略,以高原地区常见的挺水植物香蒲(Typha orientalis)为研究对象,通过构建封顶式人工生长室模拟增温2 ℃和CO2浓度倍增的气候变化,检测其叶片功能性状,结果表明:(1)与对照组相比,CO2浓度倍增处理下,香蒲的净光合速率、气孔导度、胞间CO2摩尔分数和蒸腾速率都显著降低(P<0.05);增温处理下,香蒲的净光合速率和气孔导度也显著降低(P<0.05),表明增温和CO2浓度倍增显著降低了香蒲的光合碳同化能力。(2)与对照组相比,CO2浓度倍增处理下,香蒲叶脉密度显著增加;增温处理下叶脉密度和气孔密度显著增加,而维管束面积和导管面积显著降低(P<0.05),反映了香蒲在增温和CO2浓度升高条件下香蒲水分输送和蒸腾散失能力增强,其水分利用效率显著降低。(3)与对照组相比,增温和CO2浓度倍增处理下香蒲叶光合参数间的相关性减弱,净光合速率与叶结构性状间的紧密关系显著增强。研究结果证明了增温和CO2浓度升高显著增强香蒲叶功能性状间的功能协同和权衡关系。

关键词: 高原湿地, 增温, CO2浓度升高, 植物功能性状, 香蒲, 水力平衡

Abstract:

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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