Sap flow index as an indicator of water storage use

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Title:Sap flow index as an indicator of water storage use
Creators:
Nadezhdina, Nadezhda; nadezdan at mendelu dot cz; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Čermák, Jan; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Downey, Alec; ICT International Pty Ltd, PO Box 503 Armidale NSW 2350, Australia.
Nadezhdin, Valeriy; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Perämäki, Martti; University of Helsinki, Yliopistonkatu 4, 00100 Helsinki, Finland.
David, Jorge Soares; Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Pinto, Clara A.; Instituto Nacional de Investigação Agrária e Veterinária I.P., Quinta do Marquês, Av. da República, 2780-159 Oeiras, Portugal.
David, Teresa Soares; Centro de Estudos Florestais, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 63, 2, pp. 124-133
Uncontrolled Keywords:diameter fluctuation, heat field deformation, multi-point sensor, symmetrical temperature difference, radial and circumferential variations, sap flow measurement, tree, transpiration

Abstract

Symmetrical temperature difference also known as the sap flow index (SFI) forms the basis of the Heat Field Deformation sap flow measurement and is simultaneously collected whilst measuring the sap flow. SFI can also be measured by any sap flow method applying internal continuous heating through the additional installation of an axial differential thermocouple equidistantly around a heater. In earlier research on apple trees SFI was found to be an informative parameter for tree physiological studies, namely for assessing the contribution of stem water storage to daily transpiration. The studies presented in this work are based on the comparative monitoring of SFI and diameter in stems of different species (Pseudotsuga menziesii, Picea omorika, Pinus sylvestris) and tree sizes. The ability of SFI to follow the patterns of daily stem water storage use was empirically confirmed by our data. Additionally, as the HFD multipointsensors can measure sap flow at several stem sapwood depths, their use allowed to analyze the use of stored water in different xylem layers through SFI records. Radial and circumferential monitoring of SFI on large cork oak trees provided insight into the relative magnitude and timing of the contribution of water stored in different sapwood layers or stem sectors to transpiration.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Sap flow index as an indicator of water storage use
Translated title:Sap flow index as an indicator of water storage use
Creators:
Nadezhdina, Nadezhda; nadezdan at mendelu dot cz; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Čermák, Jan; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Downey, Alec; ICT International Pty Ltd, PO Box 503 Armidale NSW 2350, Australia.
Nadezhdin, Valeriy; Mendel University, Zemedelska 3, 613 00 Brno, Czech Republic.
Perämäki, Martti; University of Helsinki, Yliopistonkatu 4, 00100 Helsinki, Finland.
David, Jorge Soares; Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Pinto, Clara A.; Instituto Nacional de Investigação Agrária e Veterinária I.P., Quinta do Marquês, Av. da República, 2780-159 Oeiras, Portugal.
David, Teresa Soares; Centro de Estudos Florestais, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal.
Uncontrolled Keywords:diameter fluctuation, heat field deformation, multi-point sensor, symmetrical temperature difference, radial and circumferential variations, sap flow measurement, tree, transpiration
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:63
Number:2
Page Range:pp. 124-133
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8392
Item Type:Article
Deposited On:07 Apr 2015 13:04
Last Modified:07 Apr 2015 11:04

Citation

Nadezhdina, Nadezhda; Čermák, Jan; Downey, Alec; Nadezhdin, Valeriy; Perämäki, Martti; David, Jorge Soares; Pinto, Clara A.; David, Teresa Soares (2015) Sap flow index as an indicator of water storage use. Journal of Hydrology and Hydromechanics, 63 (2). pp. 124-133. ISSN 0042-790X

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