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Radial sap flux profiles and beyond: an easy software analysis tool

Kathy Steppe UGent, DJW De Pauw, An Saveyn UGent, P Tahon, N Nadezhdina, J Cermak and Raoul Lemeur UGent (2009) Acta Horticulturae. 846. p.85-91
abstract
Sap flow measurements are nowadays used worldwide to validate forest-ecosystem estimates of water use and storage. Tall trees with large radial variability in sap flux across their sapwood still present a challenge in scaling single point sap flux measurements to whole-tree sap flow. Assessment of the radial sap flux profile is, hence, necessary to make a precise scaling possible. A sensor useful for assessing the radial sap flux profile in trees is the heat field deformation (HFD) sensor. This sensor records changes in the heat field around a linear heater at different radial positions in the xylem and links the heat field deformation to sap flow. The technical construction of the HFD-sensor, however, requires the configuration of multiple channels on the data logger (usually 8 to 12 channels per sensor or 48 to 72 channels per one “cross section” of the tree trunk when using 6 sensors in one cross section). Logging each channel with a small scan rate (e.g. 5 min) quickly results in a massive amount of data. The task of analysing these large data sets can become difficult and cumbersome with spreadsheet programs and the large file sizes often prevent efficient data interpretation. The objective of this paper was therefore to develop a software tool for easy analysis of HFD-data sets, including very large ones. Its primary use is to visualise in a fast way the measured radial sap flux profile in both 2D and 3D. The computed results can be saved in a compact form, drastically reducing the resulting file size in comparison to the output generated using classical spreadsheet programs. But the features of the software tool go beyond the analysis of radial sap flux profiles. Due to easy determination, K-values inherent to the sap flux density calculations can now be used to derive stem specific properties (e.g. relative water content) or raw signals can be used to quantify the sap flow index.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
K-value, sap flux density, sap flow rate, water use, 2D and 3D visualisation, heat field deformation sensor (HFD)
in
Acta Horticulturae
Acta Hortic.
editor
E Fernández and A Diaz-Espejo
volume
846
issue title
VII International workshop on sap flow
pages
85 - 91
publisher
International Society for Horticultural Science (ISHS)
place of publication
Leuven, Belgium
conference name
7th International workshop on Sap Flow
conference location
Sevilla, Spain
conference start
2008-10-21
conference end
2008-10-24
Web of Science type
Proceedings Paper
Web of Science id
000305694500007
ISSN
0567-7572
ISBN
9789066056824
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1006831
handle
http://hdl.handle.net/1854/LU-1006831
alternative location
http://www.actahort.org/books/846/846_7.htm
date created
2010-07-08 20:47:01
date last changed
2013-02-06 13:36:04
@inproceedings{1006831,
  abstract     = {Sap flow measurements are nowadays used worldwide to validate forest-ecosystem estimates of water use and storage. Tall trees with large radial variability in sap flux across their sapwood still present a challenge in scaling single point sap flux measurements to whole-tree sap flow. Assessment of the radial sap flux profile is, hence, necessary to make a precise scaling possible. A sensor useful for assessing the radial sap flux profile in trees is the heat field deformation (HFD) sensor. This sensor records changes in the heat field around a linear heater at different radial positions in the xylem and links the heat field deformation to sap flow. The technical construction of the HFD-sensor, however, requires the configuration of multiple channels on the data logger (usually 8 to 12 channels per sensor or 48 to 72 channels per one {\textquotedblleft}cross section{\textquotedblright} of the tree trunk when using 6 sensors in one cross section). Logging each channel with a small scan rate (e.g. 5 min) quickly results in a massive amount of data. The task of analysing these large data sets can become difficult and cumbersome with spreadsheet programs and the large file sizes often prevent efficient data interpretation. The objective of this paper was therefore to develop a software tool for easy analysis of HFD-data sets, including very large ones. Its primary use is to visualise in a fast way the measured radial sap flux profile in both 2D and 3D. The computed results can be saved in a compact form, drastically reducing the resulting file size in comparison to the output generated using classical spreadsheet programs. But the features of the software tool go beyond the analysis of radial sap flux profiles. Due to easy determination, K-values inherent to the sap flux density calculations can now be used to derive stem specific properties (e.g. relative water content) or raw signals can be used to quantify the sap flow index.},
  author       = {Steppe, Kathy and De Pauw, DJW and Saveyn, An and Tahon, P and Nadezhdina, N and Cermak, J and Lemeur, Raoul},
  booktitle    = {Acta Horticulturae},
  editor       = {Fern{\'a}ndez, E and Diaz-Espejo, A},
  isbn         = {9789066056824},
  issn         = {0567-7572},
  keyword      = {K-value,sap flux density,sap flow rate,water use,2D and 3D visualisation,heat field deformation sensor (HFD)},
  language     = {eng},
  location     = {Sevilla, Spain},
  pages        = {85--91},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Radial sap flux profiles and beyond: an easy software analysis tool},
  url          = {http://www.actahort.org/books/846/846\_7.htm},
  volume       = {846},
  year         = {2009},
}

Chicago
Steppe, Kathy, DJW De Pauw, An Saveyn, P Tahon, N Nadezhdina, J Cermak, and Raoul Lemeur. 2009. “Radial Sap Flux Profiles and Beyond: An Easy Software Analysis Tool.” In Acta Horticulturae, ed. E Fernández and A Diaz-Espejo, 846:85–91. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Steppe, K., De Pauw, D., Saveyn, A., Tahon, P., Nadezhdina, N., Cermak, J., & Lemeur, R. (2009). Radial sap flux profiles and beyond: an easy software analysis tool. In E. Fernández & A. Diaz-Espejo (Eds.), Acta Horticulturae (Vol. 846, pp. 85–91). Presented at the 7th International workshop on Sap Flow, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Steppe K, De Pauw D, Saveyn A, Tahon P, Nadezhdina N, Cermak J, et al. Radial sap flux profiles and beyond: an easy software analysis tool. In: Fernández E, Diaz-Espejo A, editors. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2009. p. 85–91.
MLA
Steppe, Kathy, DJW De Pauw, An Saveyn, et al. “Radial Sap Flux Profiles and Beyond: An Easy Software Analysis Tool.” Acta Horticulturae. Ed. E Fernández & A Diaz-Espejo. Vol. 846. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2009. 85–91. Print.