摘要
以田间栽培的2年生铁观音茶树为试验材料,应用叶绿素荧光诱导动力学技术,以不灌溉为对照,分析不同灌溉间隔时间处理[5 d(T1)、10 d(T2)、15 d(T3)、20 d(T4)和25 d(T5)]对铁观音茶树叶片光合作用的影响.结果表明:随着灌溉间隔期的延长,2年生铁观音茶树叶片水势和叶绿素含量降低;净光合速率(Pn)先上升后降低,在T2下达到最大(15.55μmol·m-2·s-1);光系统Ⅱ(PSⅡ)的原初光能转化效率(Fv/Fm)、可变荧光衰减(ΔFv)和可变荧光淬灭速率(ΔFv/Fo)均在T2下达到最大值,分别为0.844、342.5和4.03.初始荧光(Fo)随着灌溉间隔期的延长而降低,而对照的Fo则呈上升趋势,表明干旱可对茶树叶片PSⅡ造成损害.灌溉间隔期为10 d处理有利于茶树叶片光合电子的传递和CO2的同化,提高茶树的光合作用效率.
By using chlorophyll fluorescence kinetics technique, the effects of different irrigation intervals, i. e. , 5 d （T1）, 10 d （T2） , 15 d （T3）, 20 d （T4）, and 25 d （T5） , on the photosynthesis of 2-year Tieguanyin tea plants were investigated in the field, with no irrigation as the control. The results showed that the leaf water potential and chlorophyll content decreased with increasing irrigation interval, while the net photosynthesis （Pn） increased first and decreased then, reaching its highest value （ 15.55 μmol·m^-2·s^-1 ） in treatment T2. The ratio of the variable to maximal fluorescence （Fv/Fm）, the variable fluorescence quenching （△Fv ）, and the variable fluorescence quenching rate （△Fv/Fo） all got the highest in treatment T2, being 0. 844, 342.5, and 4. 03, respectively. The initial fluorescence （Fo） decreased with increasing irrigation interval, while a reverse changing trend of Fo was observed in the control, demonstrating that PS Ⅱ reaction center was damaged by drought stress. In conclusion, irrigating per 10 d was favorable to the photosynthetic electron transport and CO2 assimilation of the tea plants, which would enhance their photosynthesis efficiency.
出处
《应用生态学报》
CAS
CSCD
北大核心
2008年第10期2132-2136,共5页
Chinese Journal of Applied Ecology
基金
福建省教育厅项目(2007F5016)
福建省生态学重点学科项目(0608537)
福建省农科教结合项目
福建省水利厅资助项目
关键词
灌溉处理
铁观音茶树
叶绿素a荧光动力学参数
光合作用
irrigation treatment
Tieguanyin tea plant （Camellia sinensis L. O. Kuntze）
chlorophyll a fluorescence kinetic parameters
photosynthesis
