The leaf traits of Populus simonii × P.euphratica with different planting years were investigated and the suitable indexes for the adaptability evaluation of different forest ages was screened, which shall provide the theoretical basis for evaluating the adaptability of Populus simonii × P. euphratica in desert oasis. The leaf shape of Populus simonii × P. euphratica is mainly lanceolate and oval; the net photosynthetic rate, stomatal conductance, transpiration rate and intercellular CO₂ concentration of Populus simonii × P.euphratica increase with the growth age, and there are significant differences between different forest ages (P＜0.05), and the leaf traits of Populus euphratica have extremely significant correlations with each other (P<0.01), Net photosynthetic rate and stomatal conductance can be used as the main factors to evaluate leaf traits of Populus euphratica at different growth ages, the results of evaluating its leaf traits are more reliable with the increases of growth age.

Populus simonii×P. euphratica  /  leaf traits  /  photosynthetic characteristics  /  Ulanbuh desert