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不同遮荫下多脉青冈和金叶含笑幼苗叶片的气体交换日变化
引用本文:李晓征,彭峰,徐迎春,郝日明.不同遮荫下多脉青冈和金叶含笑幼苗叶片的气体交换日变化[J].浙江林学院学报,2005,22(4):380-384.
作者姓名:李晓征  彭峰  徐迎春  郝日明
作者单位:1. 广西交通职业技术学院,土木工程系,广西,南宁,530023;南京农业大学,园艺学院,江苏,南京,210095
2. 江苏省·中国科学院植物研究所,江苏,南京,210014
3. 南京农业大学,园艺学院,江苏,南京,210095
基金项目:引进国际先进农业科技计划(948计划)
摘    要:运用生理生态研究方法,选取多脉青冈Cyclobalanopsis multinervis和金叶含笑Michelia foveolata的幼苗为研究对象,在全光照、1层遮荫和2层遮荫3种不同遮荫处理下,对其叶片气体交换日变化进行了测试分析.结果表明:遮荫处理改变了多脉青冈和金叶含笑的叶片气体交换日变化曲线,表现为遮荫处理下多脉青冈的净光合速率在1 d之内明显降低;金叶含笑的净光合速率在中午前随遮荫程度的加大而下降,但11:00时1层遮荫处理下的净光合速率最高,中午以后全光照和1层遮荫处理下的净光合速率相差不大.遮荫处理同时明显降低了1 d之内叶片的蒸腾速率和气孔导度,细胞间隙CO2体积分数日变化与净光合速率的日变化基本相反.多脉青冈和金叶含笑的净光合速率在13:00左右出现了明显的降低,发生了光合"午休"现象.图9参12

关 键 词:植物生理学  遮荫  多脉青冈  金叶含笑  气体交换
文章编号:1000-5692(2005)04-0380-05
收稿时间:2004-10-08
修稿时间:2004-10-082005-01-17

Diurnal variation of leaf gas exchange in Cyclobalanopsis multinervis and Michelia foveolata seedlings under different shadings
LI Xiao-zheng,PENG Feng,XU Ying-chun,HAO Ri-ming.Diurnal variation of leaf gas exchange in Cyclobalanopsis multinervis and Michelia foveolata seedlings under different shadings[J].Journal of Zhejiang Forestry College,2005,22(4):380-384.
Authors:LI Xiao-zheng  PENG Feng  XU Ying-chun  HAO Ri-ming
Abstract:Leaf gas exchange of photosynthesis in Cyclobalanopsis multinervis and Michelia foveolata seedlings were studied by ecophysiological techniques under full light,one-layer shading and two-layer shading.The curves of leaf gas exchange diurnal variation in C.multinervis and M.foveolta were changed by shading.Photosynthetic rate of C.multinervis decreased obviously during daytime.With the increasing of shading,photosynthetic rate of M.foveolta decreased before noon,its photosynthetic rate was the highest at 11:00 am under one layer shading.Moreover there was no significant difference of photosynthetic rates under full light and two-layer shading treatments after noon.Transpiration rate and stomatal conductance were decreased obviously by shading during daytime,but photosynthetic diurnal variation of intercellular CO_2 concentration was contrary to that of photosynthetic rate.Photosynthetic rates of C.multinervis and M.foveolta decreased obviously at 1:00 pm,which led to 'midday depression of photosynthetic rate'.This study showed the diurnal variation of leaf gas exchange in C.multinervis and M.foveolata seedlings under different shadings and provided the scientific foundations for taking measures of scientific planting and management.Ch,9 fig.12 ref.]
Keywords:plant physiology  shading  Cyclobalanopsis rnultinervis  Michelia foveolata  gas exchange
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