Evaluation of the heat pulse velocity method for measuring sap flow in<i>Pinus patula</i>

Dye, P. J.; Soko, S.; Poulter, A. G.

doi:10.1093/jxb/47.7.975

Cited by 29 publications

(17 citation statements)

References 12 publications

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“…Heat pulse velocity (HPV) has been shown to be a useful method for measuring flow in several hardwoods (14). However, the HPV method has not been sufficiently verified for softwoods, because of the structure of softwood that gives rise to a complex radial flow (14).…”

Section: Discussionmentioning

confidence: 99%

“…However, the HPV method has not been sufficiently verified for softwoods, because of the structure of softwood that gives rise to a complex radial flow (14). Even though Dye et al (14) mention minimal disturbance as an advantage of the HPV method, heating of the trunk of a tree as well as inserting probes inside the trunk might have an effect on its function.…”

Section: Discussionmentioning

confidence: 99%

“…Also, other methods like radio-and stable isotopes (12), poto-and lysimeters (13), and thermal methods have been used. Thermal methods, i.e., heat pulse velocity (HPV) (13)(14)(15) and heat balance (13,(16)(17)(18)(19), are based on either pulsating or continuous heating of the trunk and then recording the temperature rise at a specified distance. However, in pine trees, the well-defined ring structure gives rise to a complex radial pattern of sap flow (14), which is not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

“…Thermal methods, i.e., heat pulse velocity (HPV) (13)(14)(15) and heat balance (13,(16)(17)(18)(19), are based on either pulsating or continuous heating of the trunk and then recording the temperature rise at a specified distance. However, in pine trees, the well-defined ring structure gives rise to a complex radial pattern of sap flow (14), which is not yet fully understood. Dye et al showed that HPV sap flow values consistently overestimated water uptake because the heat is also conducted to areas that do not transport water (14).…”

Section: Introductionmentioning

confidence: 99%

“…However, in pine trees, the well-defined ring structure gives rise to a complex radial pattern of sap flow (14), which is not yet fully understood. Dye et al showed that HPV sap flow values consistently overestimated water uptake because the heat is also conducted to areas that do not transport water (14).One possibility is to use MRI for water flow studies. Some benefits of MRI are its noninvasive and nondestructive nature.…”

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confidence: 99%

See 4 more Smart Citations

MRI-Based D2O/H2O-Contrast Method to Study Water Flow and Distribution in Heterogeneous Systems: Demonstration in Wood Xylem

Ilvonen¹,

Palva²,

Perämäki

et al. 2001

Journal of Magnetic Resonance

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

MRI-Based D2O/H2O-Contrast Method to Study Water Flow and Distribution in Heterogeneous Systems: Demonstration in Wood Xylem

Ilvonen¹,

Palva²,

Perämäki

et al. 2001

Journal of Magnetic Resonance

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Conductive sapwood area prediction from stem and canopy areas—allometric equations of Kalahari trees, Botswana

2017

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Conductive sapwood (xylem) area (Ax) of all trees in a given forested area is the main factor contributing to spatial tree transpiration. One hundred ninety‐five trees of 9 species in the Kalahari region of Botswana were felled, stained, cut into discs, and measured to develop allometric equations predicting Ax from estimates of stem (As) and canopy (Ac) areas. Stem discs were also subjected to laboratory‐based computed tomography, which well detected wood density contrasts but was not diagnostic with regard to delineation of Ax. The staining experiment, along with the help of visual and computed tomography analysis, allowed the definition of 4, tree‐species categories of Ax, C1–C4. In C1 (Acacia erioloba, Terminalia sericea, and Burke Africana), the staining and visual delineation of Ax matched the natural color difference between sapwood and heartwood; in C2 (Dichrostachys cinerea and Ochna pulchra), sapwood was divided into external conductive and internal nonconductive annuli; in C3 (Acacia fleckii and Acacia luederitzii), sapwood had sharp staining boundary between external highly conductive and internal low‐conductive annuli; and in C4 (Lonchocarpus nelsii and Boscia albitrunca), stems had no heartwood. Per‐species 0‐intercept linear regression models, Ax = slope.As (slope = 0.392 ÷ 0.794; R2 = 96.7 ÷ 99.8%) and Ax = slope.Ac (slope = 1.477 ÷ 17.044; R2 = 82.1 ÷ 92.2%) yielded excellent to good predictive allometric equations. The first equation is suitable for Ax scaling of small‐size Kalahari areas, where the As of all trees can be estimated on the ground, whereas the second, as contribution to automated tree transpiration mapping of large‐size Kalahari areas, where the Ac of trees can be derived through remote sensing interpretation of high‐resolution images.

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Groundwater contribution to transpiration of trees under wet and dry soil conditions*

Tfwala

Rensburg

Bello

2020

Irrigation and Drainage

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The objective of this study was to partition tree T under shallow groundwater table conditions into groundwater (Tgw) and soil water (Tsw). Three indigenous trees growing in lysimeters were installed with the compensation heat pulse velocity method to measure stem sap flow half‐hourly. Soil water content was monitored using HydraSCOUT probes. A groundwater table of 20 cm depth was maintained, and daily water replenishment to maintain a constant groundwater table was monitored using a graduated automatic supply bucket system. The contribution of Tgw towards total T for the investigated trees ranged from 31% when the topsoil was wet to 97% when it was dry. The contribution of Tsw ranged from 3% when the topsoil was dry to 69% after an irrigation event. It was concluded that trees switch to source water from superficial soil layers when the topsoil is wet and from groundwater during dry conditions.

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Evaluation of the heat pulse velocity method for measuring sap flow inPinus patula

Cited by 29 publications

References 12 publications

MRI-Based D2O/H2O-Contrast Method to Study Water Flow and Distribution in Heterogeneous Systems: Demonstration in Wood Xylem

MRI-Based D2O/H2O-Contrast Method to Study Water Flow and Distribution in Heterogeneous Systems: Demonstration in Wood Xylem

Conductive sapwood area prediction from stem and canopy areas—allometric equations of Kalahari trees, Botswana

Groundwater contribution to transpiration of trees under wet and dry soil conditions*

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