Articles | Volume 24, issue 5
Hydrol. Earth Syst. Sci., 24, 2755–2767, 2020
Hydrol. Earth Syst. Sci., 24, 2755–2767, 2020

Technical note 28 May 2020

Technical note | 28 May 2020

Technical note: Long-term probe misalignment and proposed quality control using the heat pulse method for transpiration estimations

Elisabeth K. Larsen et al.

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Subject: Ecohydrology | Techniques and Approaches: Instruments and observation techniques
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Cited articles

Barrett, D. J., Hatton, T. J., Ash, J. E., and Ball, M. C.: Evaluation of the heat pulse velocity technique for measurement of sap flow in rainforest and eucalypt forest species of south-eastern Australia, Plant Cell Environ., 18, 463–469,, 1995. 
Becker, P. and Edwards, W. R. N.: Corrected heat capacity of wood for sap flow calculations, Tree Physiol., 19, 767–768,, 1999. 
Bréda, N., Granier, A., and Aussenac, G.: Effects of thinning on soil and tree water relations, transpiration and growth in an oak forest (Quercus petraea (Matt.) Liebl.), Tree Physiol., 15, 295–306, 1995. 
Burgess, S. S. O., Adams, M. A., Turner, N. C., Beverly, C. R., Ong, C. K., Khan, A. A. H., and Bleby, T. M.: An improved heat pulse method to measure low and reverse rates of sap flow in woody plants, Tree Physiol., 21, 589–598,, 2001. 
Cohen, Y., Cohen, S., Cantuarias-Aviles, T., and Schiller, G.: Variations in the radial gradient of sap velocity in trunks of forest and fruit trees, Plant Soil, 305, 49–59,, 2008. 
Short summary
To improve long-term sap flow measurements when using the heat ratio method, this study introduces a dynamic probe misalignment correction method. This work uses sap flow data from four Aleppo pines from April 2017 to December 2018 and shows how a classical probe correction approach declines in accuracy over time. Additionally, it is proposed that a new set of statistical information be recorded along with the sap flow readings to ensure the quality of the raw data.