杂种榛子不同方位叶片光合作用的日变化  

Diurnal Variation in Photosynthesis of Differently Directional Leaves in Hybrid Hazels (Corylus heterophylla×Corylus avellana)

作　　者：李六林[1] 季兰[1] 

机构地区：[1]山西农业大学园艺学院,太谷030801

出　　处：《林业科学》2006年第12期47-53,共7页Scientia Silvae Sinicae

基　　金：山西省资助回国留学人员项目(2001036);山西省自然科学基金项目(20031076)。

摘　　要：以平欧110号和平欧349号为试材，研究了榛子不同方位叶片的光合特性，并对影响光合作用的因子进行了分析，结果表明：榛子南、北面叶片光合速率（砌）的日变化为双峰曲线，西面叶片为单峰曲线，高峰出现在上午的7：00—8：00，东面叶片的光合速率的变化较平稳，无明显的高峰，不同方位叶片光合速率午问变化主要受到非气孔的限制作用；不同方位叶片的平均光合速率和CO2同化量有一定的差异，以南面叶片为最高，其次为西、北面叶片，以东面叶片为最低；平欧110号和平欧349号的光饱和点大约分别为691—724μmol·m^-2s^-1和464—505μmol·m^-2s^-1，其光补偿点分别为10．26μmol·m^-2s^-1和8．21μmol·m^-2s^-1，均较常见的落叶果树低；采用逐步回归分析表明，水汽饱和差（VPD）和光量子通量密度（PFD）是影响光合速率的主导因子。Photosynthesis of differently directional leaves in Ping-ou 110 and Ping-ou 349 and its influencing factors were studied and analyzed. The results indicated that diurnal variation of net photosynthesis rate （Pn） of southern and northern leaf were two-peak curve. That of western leaf was single peak curve, and the peak appeared at 7：00-8：00 in the morning, but diurnal variation in net photosynthesis rate of eastern leaf was relatively steady, did not appear apparent peak. Pn changes of differently directional leaves at noon primarily were contributed to limitation of non stomatal factor; There were some difference in average net photosynthesis rate and assimilating CO2 capacity of differently directional leaves, the highest was southern leaf, next was western and northern leaf, the lowest was eastern leaf; light saturation points of Ping-ou 110 and Ping-ou 349 were 691 - 724 μmol·m^-2s^-1 and 464 - 505 μmol·m^-2s^-1 , light compensation points were 10 - 26 μmol·m^-2s^-1 and 8 - 21μmol·m^-2s^-1, respectively, they were lower than those of common deciduous fruit trees; vapor pressure deficiency （VPD） and photo fluid density （PFD） were dominantly influencing factors of net photosynthesis rate as shown multiple stepwise regression analyses.

关 键 词：杂种榛子 光合速率 气孔导度 细胞间隙CO2浓度 环境因子 

分 类 号：S718.43[农业科学—林学]