Abstract:In order to selection of excellent provenance of Excentrodendron hsienmu, the monthly changes in photosynthetic and growth characteristic were studied by using a completely random zone experiment design. The results showed that the photosynthetic and growth characteristics of E. hsienmu had significantly differences among different months and different provenances. The net photosynthetic rate, stomata conductance, transpiration rate and water use efficiency (WUE) changed with the month, indicated the adaptability to climate changes. The net photosynthetic rate, stomata conductance and transpiration rate of different provenances were the highest in August, but low in April and December. However, the WUE were the lowest in August, and high in April and December. The seedling height had significant positive correlation with ground diameter and net photosynthetic rate and seedling height, as well as the net photosynthetic rate and ground diameter. The net photosynthetic rate could be used as indicative monitoring indicators in the growth process of E. hsienmu. The provenances of Daxin, Wuming and Long'an had high net photosynthetic rate and growth increment and low transpiration rate during whole growing season. Therefore, the three provenances of Daxin, Wuming and Long'an were more suitable to introduction planting in Nanning area.
