红榉光合生理特性日变化规律  

Diurnal change of photosynthetic characteristics of Zelkova schneideriana.

作　　者：王旭军[1] 吴际友[1] 唐水红[1] 陈瑞[1] 程勇[1] 朱树长[1] 

机构地区：[1]湖南省林业科学院,湖南长沙410004

出　　处：《湖南林业科技》2012年第1期10-13,37,共5页Hunan Forestry Science & Technology

基　　金：国家"十二五"科技支撑项目(2011BAD38B03);国家林业局948项目(2008-4-23)

摘　　要：在生长季节对红榉的光合等生理特性日动态变化进行了测定。结果表明,红榉的净光合速率(Pn)日变化呈双峰型,呈轻微的光合"午休"现象,其峰值分别出现在上午8:00和下午14:00。根据日变化参数Pn、胞间CO2摩尔分数(Ci)和气孔限制值(Ls)的变化方向,推断红榉的光合"午休"主要受非气孔因素限制。相关分析和多元逐步回归分析表明,影响红榉光合速率日变化的主要生理生态因子为Tr、Vpdl、Ca和Ci等。The diurnal change of photosynthesis and its affecting factors of Zelkova schneideriana Hand-Mazz was surveyed in the grow- ing season. The results demonstrated that the diurnal change of net photosynthetic rate （Pn） showed double-peak curve with a slightly midday depression, with maximum values occurred at about 8 ： 00 am and 14 ： 00 pm. And the midday depression of Z. schneideriana Hand-Mazz was mainly controlled by non-stomatal factors judging from the changing tendency of net photosynthetic rate, intercellular CO2 concentration （ Ci ） and stomatal limitation （ Ls ）. Correlation and regression analyses showed that Tr , Vpdl , Ca and Ci were impertant affecting factors on the photosynthesis of Z. schneideriana Hand-Maz.z.

关 键 词：红榉 日变化 光合作用 生理生态特征 

分 类 号：S718.43[农业科学—林学]