Diurnal Photosynthetic Changes of Trifolium L. Under Different Light Circumstances

The Photosynthetic changes of trifolium L.were studied at the full light and light shaded conditions.The results showed that the net photosynthetic rates of the trifolium L under full light were higher than those under light shaded conditions.The daily patterns of net photosynthetic rate and transpiration rate appeared as double-peak curves.The stomatal limitation was the main factor of midday photosynthetic break.The trends of diurnal stomatal Conductance was similitudear to the diurnal net photosynthetic rates,and the intercellular CO2 concentration has a negative relationship to the net photosynthetic rate.The diurnal curves of Pn,Tr,Gs,Ci under light shaded conditions were different to full light conditions.