Abstract:

In order to explore the effects of different nitrogen levels on the growth and photosynthetic physiological characteristics of Chorisia speciosa and other three species seedlings, the exponential fertilization method was used on four species seedlings fertilization experiment. The results showed that: (1) seedling growth with different nitrogen treatments was significantly different, biomass and seedling height was influenced significantly by nitrogen, the change of ground diameter was minimum. (2) Photosynthetic physiological characteristics with different nitrogen treatments had significant differences, net photosynthetic rate of Chorisia speciosa first increased and then decreased, stomatal conductance and intercellar CO2 concentration first decreased and then increased and then decreased again, transpiration rate first increased and then decreased twice with the increase of nitrogen supply. Net photosynthetic rate, net photosynthetic rate and transpiration rate of other three tree species first increased and then decreased twice with the increase of nitrogen supply.