By using LI-6400 CO2 gas analysis system,we studied the diurnal variations of photosynthetic rate and light curve of two introduction plants in Beijing.The results are summarized as follows.The curves of diurnal variation in Pn,Tr of Fraxinus mandshurica and Rhus typhina leaves have two peaks while the curve of diurnal variation in WUE has one peak,but they have differences in the time and the value of the peaks occurred in terms of Pn,Tr,and WUE.The Pn and WUE for R.typhina are higher than those for F.mandshurica.However,Tr is obviously lower in R.typhina than that in F.mandshurica.Through the light curve of two introduction plants we can see that they are sun plants;besides R.typhina is broader in ecological adaptability for light,while F.mandshurica has the high shade-tolerance.The major factors affecting the photosynthetic rate are the stomatal conductance, intercellular CO2 concentration and photosynthetic active radiation.By comparing the habitats we can see that photosynthetic capacity of R.typhina has a rise while that of F.mandshurica just has a little change.We can conclude that R.typhina has advantages in competition with F.mandshurica in Beijing.
胡耀升, 刘艳红*. 北京引进树种火炬树和水曲柳的光合特征[J]. , 2012, 31(4): 377-383.
HU Yao-sheng, LIU Yan-hong. Study on eco-physiological characteristics of Rhus typhina and Fraxinus mandshurica in Beijing. , 2012, 31(4): 377-383.
[26] Bazzaz F A and Roger W C.Photosynthetic Acclimation to Variability in the Light Environment of Early and Late Successional Plants[J].Oecologia,1982,(54):313-316.
