Flexible external heat-pulse sap flow sensor for bi-directional measurement of sap-flow in small diameter stems

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dc.contributor.authorRennie M, M.
dc.contributor.authormorgenroth, justin
dc.contributor.authorWatson, Matthew
dc.date.accessioned2024-11-25T22:40:53Z
dc.date.available2024-11-25T22:40:53Z
dc.date.issued2023
dc.description.abstractAt present, most sap flow sensors are probe-based and therefore inappropriate with small diameter trees, where large comparative amounts of cross-sectional xylem will be disrupted by the probes and heat produced. While external non-invasive sap flow sensors can measure bi-directional flow in trees with diameters less than 10 mm, they are based on the heat ratio method derived from a line heat source. This presents the potential to create localised heating around the heat source, disrupting the natural flow of sap within the tree. Therefore, in this study, we propose a non-invasive sap flow sensor consisting of a ring heat source heating the circumference of the stem along with a modified heat ratio method. Calibration of the measured heat pulse velocity (𝒗𝒉) was conducted by gravimetric measurement of an imposed flow through sections of stem. Two species were examined: white poplar (Populus alba) and paper birch (Betula papyrifera). Preliminary results of the sap flow sensor show linear agreement of both species with their imposed flow, ranging between -20 to 20 g h-1.
dc.identifier.citationRennie M, Morgenroth J, Watson M (2023). Flexible external heat-pulse sap flow sensor for bi-directional measurement of sap-flow in small diameter stems of Populus alba and Betula pendula. Rotorua, New Zealand: XII International Workshop on Sap Flow. 31/10/2023-03/11/2023. Acta Horticulturae.
dc.identifier.issn0567-7572
dc.identifier.urihttps://hdl.handle.net/10092/107740
dc.publisherInternational Society for Horticultural Science (ISHS)
dc.rightsAll rights reserved unless otherwise stated
dc.rights.urihttp://hdl.handle.net/10092/17651
dc.subjectbi-directional sap flow
dc.subjectheat ratio method
dc.subjectsap flow sensor
dc.subjectwhite poplar (Populus alba)
dc.subjectpaper birch (Betula papyrifera)
dc.subject.anzsrc30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300710 - Tree nutrition and physiology
dc.subject.anzsrc30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300799 - Forestry sciences not elsewhere classified
dc.titleFlexible external heat-pulse sap flow sensor for bi-directional measurement of sap-flow in small diameter stems
dc.typeConference Contributions - Published
uc.collegeFaculty of Engineering
uc.departmentChemical and Process Engineering
uc.departmentSchool of Forestry
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