The curves of diurnal variation of Pn and COND were typical double-peaked, and both of Pn and COND decreased gradually with the decrease of SWC.

• 净光合速率和气孔导度的日变化曲线都是典型的“双峰”型曲线,且随着土壤含水量的下降都有不同程度的下降。