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A double-ratio method to measure fast, slow and reverse sap flows
- Source :
- Tree Physiology. 41:2438-2453
- Publication Year :
- 2021
- Publisher :
- Oxford University Press (OUP), 2021.
-
Abstract
- Sap velocity measurements are useful in fields ranging from plant water relations to hydrology at a variety of scales. Techniques based on pulses of heat are among the most common methods to measure sap velocity, but most lack ability to measure velocities across a wide range, including very high, very low and negative velocities (reverse flow). We propose a new method, the double-ratio method (DRM), which is robust across an unprecedented range of sap velocities and provides real-time estimates of the thermal diffusivity of wood. The DRM employs one temperature sensor upstream (proximal) and two sensors downstream (distal) to the source of heat. This facilitates several theoretical, heat-based approaches to quantifying sap velocity. We tested the DRM using whole-tree lysimetry in Eucalyptus cypellocarpa L.A.S. Johnson and found strong agreement across a wide range of velocities.
- Subjects :
- 0106 biological sciences
Eucalyptus
Hot Temperature
Physiology
Flow (psychology)
Water
Plant Transpiration
Ranging
Plant Science
Mechanics
Thermal diffusivity
Wood
010603 evolutionary biology
01 natural sciences
Measure (mathematics)
Trees
Ratio method
Range (statistics)
Environmental science
Upstream (networking)
010606 plant biology & botany
Subjects
Details
- ISSN :
- 17584469
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Tree Physiology
- Accession number :
- edsair.doi.dedup.....9d21336ab5b6c9025e5473c7b6c01cc0