Diurnal sap flow was two-peak or mono-peak patterns which maximum sap flow density of the day was not corresponding to photosynthetically active radiation, whereas mono-peak pattern in the year 2000.

• 在晴天树干液流密度日变化由单峰曲线转变为双峰曲线，或单峰曲线峰值较光合有效辐射峰值显著提前或推后；