Abstract:

Influence factors on photosynthetic characteristic of superior clones of Camellia oleifera—leaf age and leaf position were studied during yearly growth periods（shoot growth stage、fruit growth stage、fruit maturation period、blooming stage and dormant stage）. The results showed that(1)The curves of the diurnal change in the net photosynthetic rate(Pn) present single and double curves in different leaf age,the average Pn and the maximun Pn of one-year-old leaves reached highest value in fruit maturation period,while two-year-old leaves,s in shoot growth stage; (2) Chlorophyll content of one-year-old leaves increased at first and then decreased,while chlorophyll content of two-year-old leaves kept decreasing, soluble protein content of all leaves kept decreasing, annual trend of phosphorus content of leaves present a “M” curve; (3) Diurnal variations of Pn of upper leaves and lower leaves are completely the same，Pn of upper leaves were higher in the morning while lower leaves,s were higher in the afternoon.