Many photosynthetic characteristics of three cherry varieties(Sato Nishiki, Stella and Napoleon Bigarreau) were studied ,such as diurnal change in net photosynthetic rate (Pn), the effects of the environmental factors on diurnal change in Pn,the effects of photosynthetic active radiation , C02 concentration and air temperature on photosynthesis of mature leaves et al.The net photosynthetic rate of different leafs locations, locations of canopy , leafs orientations, the concentration of Chla,Chlb and Chl(a+b...