Measurement of Sap Flow and Transpiration in Ring-porous Oaks Using a Heat Puise Velocity Technique
Measurement of Sap Flow and Transpiration in Ring-porous Oaks Using a Heat Puise Velocity Technique
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DOI：
10.1093/forestscience/26.3.485
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发表时间：
1980-09
期刊：
影响因子：
1.4
通讯作者：
David R. Miller;C. A. Vavrina;T. W. Christensen
中科院分区：
文献类型：
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作者：
David R. Miller;C. A. Vavrina;T. W. Christensen
“改进的”热脉冲速度（HPV）技术被证明是一个令人满意的方法来监测树干液流速度在环孔橡树。从位于热源下游2cm处的热敏电阻处的热脉冲的第一次开始的时间计算速度。通过树皮和位于形成层-木质部的接口嵌入的pistors。HPV在黑橡树的范围从0.6到22米小时-1。HPV在阳光照射的一面的树高达4倍以上的阴影侧测量，并迅速响应阳光直射的变化。平均周围的树干HPV的潜在蒸散量和茎带的吸水率呈线性相关。 随着太阳辐射通量密度从0.3增加到0.6卡cm-2分钟-1。在较高的辐射水平主要是湿度的功能。森林科学26：485-494。
A “modified” heat puise velocity (HPV) technique proved to be a satisfactory method to monitor sap velocities in ring-porous oaks. Velocities were calculated from the time of the first onset of a heat puise at a thermistor located 2 cm downstream from the heat source. The thermistors were embedded through the bark and located at the cambium-xylem interface.HPVs in black oaks ranged from 0.6 to 22 m hr–1. HPVs on sunlit sides of a tree were up to 4 times higher than those measured on a shaded side and responded very rapidly to changes in direct sunlight exposure. Average around-the-bole HPVs were linearly related to potential evapotranspiration and to rates of water uptake through stem girdles. increased with increasing solar radiation flux densities from 0.3 to 0.6 cal cm–2min–1. At higher radiation levels were primarily functions of humidity. Forest Sci. 26:485–494.