Variance analysis on net photosynthetic rate and transpiration rate of Spindus mukorossi from different provenances

To study physiological characters of net photosynthetic rate(Pn) and transpiration rate(Tr) in Spindus mukorossi from different provenances,using Li-6400 portable photosynthesis system,Pn and Tr in S.mukorossi leaves from Jing'an County and Jiujiang City were measured.The results show that,between the provenances,among crown positions and among their interaction,Pn in leaves shows significant differences,and also Tr except crown positions.But water use efficiency(WUE) shows no differences in three factors.Both Pn and Tr of different provenances show single peak parabolic trend,which all of the values from Jiujiang are higher than those from Jing'an.Pn of the middle position of crown in Jingan show a double peak curve,the peak values occur at 12:00 and 16:00 respectively,the low value occur at 14:00,and the first peak value is higher than the second peak value.Pn of the other position of crown is a single peak value.Photosynthesis in leaves at both the middle position of crown in Jiujiang and the upper position of crown in Jing'an is better than that at other positions.