Sap flow index as an indicator of water storage use

Title:

Sap flow index as an indicator of water storage use

Creator:

Nadezhdina, Nadezhda, Čermák, Jan, Downey, Alec, Nadezhdin, Valeriy, Perämäki, Martti, David, Jorge Soares, Pinto, Clara A., and David, Teresa Soares

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3e8ffa29-4b8c-4cde-8366-49095c9efc81
uuid:3e8ffa29-4b8c-4cde-8366-49095c9efc81
doi:10.1515/johh-2015-0013

Subject:

diameter fluctuation, heat field deformation, multi-point sensor, symmetrical temperature difference, radial and circumferential variations, sap flow measurement, tree, and transpiration

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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.

Language:

Slovak

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

124-133

Source:

Journal of hydrology and hydromechanics | 2015 Volume:63 | Number:2

Harvested from:

CDK

Metadata only:

false