Abstract: The photosynthetic characteristics of leaves in Chorisia speciosa were studied. The results were as follow: The light saturated point and compensate point of leaves of Chorisia speciosa were about 1 600 and 35μmol·m^{- 2} · s^{- 1} respectively, while the apparent quantum efficiency was 0.0263; The CO₂ saturatedpoint and compensate pointwere about 1 000 and 59μmol·mol^{- 1} respectively, while the carboxying efficiency was 0.0622; The optimal temperature of photosynthesis ability was 24 - 28℃; The diurnal variation of net photosynthetic rate of leaves in sunny days exhibited bimodal curve, with a lower value of the second peak than that of the first peak, whereas, a bimodal curve of the seasonal variation of Pn was observed; Pn had a significantly positive relationship with stomata conductance and a positive relationship with transp iration rate and photosynthetic active radiation, but a obvious negative relationship with intercellular CO₂ concentration. The relationship between Pn and air temperature was indefinite.

Key words: Chorisia speciosa, Photosynthesis characteristics, Physoecological factor, Correlation