Abstract:

Abstract：The main photosynthetic characteristics of E’Cha series were determined by TPS-2 under field condition. The results show that there are significant differences on net photosynthetic rate，transpiration rate，water use efficiency，intercelluar CO2 concentration and stomatal conductance among 12 tea cultivars. The water use efficiency of E’Cha No.8 and E’Cha No.9 is more than 4.0μmol/mmol，and the transpiration rate of them is lower. So they can be adapted to arid area. E’Cha No.4 and E’Cha No.10 have lower water use efficiency and higher transpiration rate than others，so we need pay attention to water management. According to the result from clustering analysis by SPSS，12 tea cultivars are classified into four groups. E’Cha No.1，E’Cha No.5 E’Cha No.5 and E’Cha No.10 are excellent in the photosynthesis characteristics，and E’Cha No.8 and E’Cha No.9 are poor in the photosynthesis characteristics.