transpiration ratio
1.The experimental study in different CO 2 concentration conditions (350×10 - 6 , 500×10 -6 , 600×10 -6 , 700×10 -6 ) for C 3 wheat, soybean, Chinese cabbage and C 4 maize showed that as CO 2 concentrion went up, then p hotosynthetic rate was increased, photosynthetic period of time was extended, bu t light compensation point and transpiration ratio were decreased, the difference between leaf and air temperature, as well as leaf temperature rise.
2.Pn,transpiration(Tr)ratio and stomata conductance(Gs)of cherry grown in field were higher than those grown in pot,but the intercellular CO2 concentration(Ci)was lower than that in pot during daytime.
3.The results showed that: 1 ) the changes of DGW resulted in the significant changes of net photosynthetic r ate (Pn), the transpiration rate (E), stomatal conductance (Gs), lea f contents o f chlorophyll a (Chl a), chlorophyll b (Chl b) and the total chlorophyll (Chl a + Chl b), the ratio of Chl a and Chl b (Chl a/Chl b), the quantum yield efficien cy and the CO 2 carboxylation efficiency;
