The effects of probe misalignment on sap flux density measurements and in situ probe spacing correction methods
The effects of probe misalignment on sap flux density measurements and in situ probe spacing correction methods
复制标题
探头未对准对液流密度测量和原位探头间距校正方法的影响
DOI：
10.1016/j.agrformet.2016.08.009
复制
发表时间：
2017-01-15
影响因子：
6.2
通讯作者：
Si, Bingcheng
中科院分区：
文献类型：
--
作者：
Ren, Ruiqi;Liu, Gang;Si, Bingcheng
The accurate measurement of sap flow is important for estimating transpiration. This paper is focused on the errors in sap flux density (J) caused by probe misalignment and on how to reduce these errors. We found that probe misalignment caused errors in the heat pulse velocity (V-h). Furthermore, probe misalignment had a large influence on thermal diffusivity (K) and the determination of zero flow points. Assuming uniform axial thermal diffusivity and zero sap flow conditions, we developed a new in situ probe spacing correction method based on three temperature sensor measurements inside the same temperature probe, which can be used for correcting both linear and nonlinear misalignments. Laboratory experimental results verified that our method could significantly reduce the errors in determinations of J by using the Compensation Heat Pulse velocity (CHP) method, the Heat Ratio (HR) method and the T-max method. (C) 2016 Elsevier B.V. All rights reserved.
