Abstract:

Taking Camellia oleifera superior clone “XL67” as materials and using the Li-6400 portable photosynthesis system, diurnal dynamics of net photosythetic rate (Pn), transpiration rate(Tr), and impact factors of Pn and Tr were researched in this paper.The results showed that:(1) Diurnal variation of net photosynthetic rate (Pn) presented a single peak curve, and no midday depression existed;(2) The diurnal variation curve of transpiration rate presented a single peak curve and the diurnal variation curve of WUE presented a double peak curve;(3) Through multiple regression analysis ,it was showed that the main factors which influenced Pn were PAR、H2OR、CO2Rand Ci, and Cond was the main factor for medium-yield variety, and Tr were mainly influenced by RH、Cond 、PAR、Ci and Vpdl.