Study of Photosynthetic Physiological Characteristics of Vitis vinifera

The variation of the relationship between Pn and physioecological factors of the Vitis vinifera L.cv cabernet sauvignon were studied with LI-6400 portable photosynthesis system at different leaf position in different times.The results showed that,the Pn of cabernet sauvignon was single peak curve from May to September at different leaf position,the biggest Pn was the 6th leaf position at May,and peak was moving to the up position leaves with the time.The relationship between Pn of different leaves positon and mainly physioecological factors was very close under the same treatments with PAR.Pn had the greatly significant positive correlation with Gs of leaves.The Tr of Cabernet Sauvignon was single peak curve from May to September at different leaf position,Tr had the significant positive correlation with VpdL and Gs,that was to say the VpdL and Gs were main factors effect the Tr.