This paper reviewed the principles of heat technique and its application in studying stem sap flow.
综述了热技术方法测定树干液流的基本原理和不同适用范围。
The sap flow velocity of Quercus variabilis was 5~10 times higher than that of the Pinus tabulaeformis on a monthly average basis.
栓皮栎月平均树干液流速率较油松的月平均树干液流速率高5-10倍。
The stem sap flow of T. ramosissima presented a single-peaked curve, with an obvious day and night variation rhythm and fluctuated with environment factors.
多枝柽柳的茎干液流呈单峰曲线型，有明显的昼夜变化规律，茎干液流随环境因子变化而波动；
There was little SAP flow at night.
夜间仍维持较低液流速率。
Air temperature and accumulation of stem SAP flow's diurnal change showed uniform trend with trunk stem SAP flow.
大气温度、累计液流量日进程变化趋势与树干液流相一致。
At night, the ascent of SAP flow could be observed in the above main tree species owning to the existence of root pressure.
夜间，胡杨同样存在明显的树干液流现象，这主要是由根压引起的。
Sap flow flux was influenced by sapwood area size, and decreased progressively from the base along the trunk to the top of tree.
不同树干高度液流通量的变化受边材面积大小的影响，自基部沿树干高度递减；
In sunshine, cloudy and rainy days, the most important environmental factors to stock SAP flow rate were air temperature, solar radiation and rainfall, respectively.
晴天、阴天、雨天影响树干液流速率最重要的环境因子分别是空气温度、太阳辐射和降雨量。
Analyzing the actual research progress and targets, we can make a conclusion that Thermal Dissipation Method will be the vital techniques on stem SAP flow measurement and calculation in the future.
对现有的研究成果和研究目标进行分析认为，热扩散方法将成为未来几年研究树木液流的重要测算方法。
Analyzing the actual research progress and targets, we can make a conclusion that Thermal Dissipation Method will be the vital techniques on stem SAP flow measurement and calculation in the future.
对现有的研究成果和研究目标进行分析认为，热扩散方法将成为未来几年研究树木液流的重要测算方法。
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