水位梯度对狭叶香蒲光合作用的影响  

Effect of water table gradient on photosynthesis of Typha angustifolia

作　　者：周文昌[1,2] 史玉虎 付甜[1] 庞宏东 黄国伟[1] ZHOU Wenchang;SHI Yuhu;FU Tian;PANG Hongdong;HUANG Guowei(Hubei Academy of Forestry, Wuhan 430075, China;Hubei Honghu Wetland Ecosystem National Research Station, Honghu 433200, China)

机构地区：[1]湖北省林业科学研究院,湖北武汉430075 [2]湖北洪湖湿地生态系统国家定位观测研究站,湖北洪湖433200

出　　处：《湖北大学学报（自然科学版）》2020年第3期306-310,共5页Journal of Hubei University：Natural Science

基　　金：湖北洪湖湿地生态系统国家定位观测研究站运行补助项目(2019132064);武汉九峰森林培育试验示范国家长期科研基地运行补助项目(2019132526)资助。

摘　　要：水淹深度的变化影响着湿地植物的生长,然而长江中游作为暴雨频繁发生区域,暴雨事件可能对长江中游湿地碳汇功能产生重要影响.本实验以盆栽方法研究不同水位条件下香蒲植物叶片光合-光响应曲线的敏感度变化,以期揭示暴雨事件对湿地碳汇功能的影响规律.研究结果表明:水位为5 cm、10 cm和20 cm的狭叶香蒲植物叶片光合-光响应曲线发生了变化,出现水位越低光合能力越强,3种处理水平下,最大净光合速率依次为25.430、14.241和6.886μmol/(m^2·s),光补偿点分别为18.94、48.32和27.16μmol/(m^2·s),光饱和点各自为6975.50、1963.07和1079.77μmol/(m^2·s).植物叶片净光合速率与气孔导度、蒸腾速率和光合有效辐射呈正相关关系.The changes of flooding depth affect the plant growth in the wetland.The heavy rains frequently occur in the middle reach of Yangtze River,which could have an important impact on the carbon sink function in the wetland ecosystems.In this study,the Typha angustifolia leaves photosynthetic light response curve was studied by the potted experiment method in different water table conditions,so as to elucidate the influential rules of the frequent heavy rain event on the carbon sink function in the wetland ecosystems.The results showed that the Typha angustifolia leaves photosynthetic light response curve had changed when the water table height ranged from 5 cm to 20 cm.As the water table height decreased,the photosynthetic capacity distinctly increased.When the water table height was 5 cm,10 cm,and 20 cm depth,the maximum net photosynthetic rate were 25.430,14.241 and 6.886μmol/(m^2·s),light compensation point were 18.94,48.32 and 27.16μmol/(m^2·s),light saturation point were 6975.50,1963.07 and 1079.77μmol/(m^2·s),respectively.Meanwhile,the net photosynthetic rate of the Typha angustifolia leaves and stomatal conductance,transpiration rate and photosynthetic active radiation were positively correlated.

关 键 词：水淹 光合作用 狭叶香蒲 挺水植物 

分 类 号：Q945.32[生物学—植物学] Q945.78