Liu Qing-Xin, Meng Ping, Zhang Jin-Song, Gao Jun, Sun Shou-Jia, Jia Chang-Rong
Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China.
Ying Yong Sheng Tai Xue Bao. 2012 Jun;23(6):1490-4.
In order to understand the accuracy of Granier' s thermal dissipation method in measuring tree water consumption, a comparative study was made from May to June, 2010. The sap flow density of potted Platycladus orientalis was measured with thermal dissipation probe, which was compared with the whole-plant gravimetric measurement. There were significant linear relationships (R2 > 0.825) between the sap flow velocity in both north and south directions of P. orientalis measured by thermal dissipation probe and the transpiration rate measured by gravimetric method. The average daily sap flux in the north and south directions of P. orientalis were 10.6% and 15.1% lower than the daily average transpiration of P. orientalis, respectively, but the differences were not significant. Therefore, Granier's method had high reliability in the measurement of P. orientalis transpiration at daily scale, though the large temperature fluctuation between day and night could result in a lower daily sap flux than daily transpiration.
为了解Granier热消散法测量树木耗水量的准确性，于2010年5月至6月进行了一项对比研究。用热消散探针测量盆栽侧柏的液流密度，并与整株重量法测量结果进行比较。热消散探针测量的侧柏南北方向液流速度与重量法测量的蒸腾速率之间存在显著的线性关系（R2>0.825）。侧柏南北方向的日均液流通量分别比侧柏的日平均蒸腾量低10.6%和15.1%，但差异不显著。因此，Granier方法在日尺度上测量侧柏蒸腾作用具有较高的可靠性，尽管昼夜之间较大的温度波动可能导致日液流通量低于日蒸腾量。
