%0 Journal Article
%A Chunhui FENG
%A Hangmei YANG
%A Hongyi CHEN
%A Lingyan LI
%A Liping LI
%A Mei SUN
%T Response of leaf Hydraulic Traits of <i>Typha orientalis</i> to Simulated Warming and Elevated CO<sub>2</sub> Concentration
%D 2023
%R 10.7525/j.issn.1673-5102.2023.05.010
%J Bulletin of Botanical Research
%P 729-740
%V 43
%N 5
%X <p>In order to explore the response strategies of plateau wetland plants to increasing temperature and CO<sub>2</sub> concentration， <i>Typha orientalis</i>， 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 CO<sub>2</sub> concentration doubling were designed by constructing a capping artificial growth chamber. The results showed that： （1）The net photosynthetic rate， stomatal conductance， intercellular CO<sub>2</sub> molar fraction and transpiration rate of <i>T. orientalis</i> under the CO<sub>2</sub> concentration doubling treatment were significantly reduced （<i>P</i>&lt;0.05）； while the net photosynthetic rate and stomatal conductance of <i>T. orientalis</i> were also significantly reduced under the warming treatment（<i>P</i>&lt;0.05） compared with the control group. The results indicated that the photosynthetic carbon assimilation capacity of <i>T. orientalis</i> was significantly reduced under the temperature increasing and CO<sub>2</sub> concentration doubling conditions（<i>P</i>&lt;0.05）. （2）The vein density of <i>T. orientalis</i> leaves increased significantly under the CO<sub>2</sub> concentration doubling treatment； while the vein density and stomatal density increased significantly， but the vascular bundle area and catheter area decreased significantly（<i>P</i>&lt;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 <i>T. orientalis</i> under the conditions of warming and CO<sub>2</sub> 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 CO<sub>2</sub> concentration doubling treatments than control group. The results showed that the functional synergistic or trade-off effects of leaf functional traits of <i>T. orientalis</i> were enhanced significantly by increasing temperature and CO<sub>2</sub> concentration.</p>
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2023.05.010