Radial Variation in the Axial Conductivity of<i>Populus</i>and its Significance in Heat Pulse Velocity Measurement

Edwards, W. R.; Booker, R. E.

doi:10.1093/jxb/35.4.551

Cited by 46 publications

(24 citation statements)

References 10 publications

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“…[9]. No SFD decrease was recorded by several authors in the outer 30−40 mm in diffuse-porous trees [8,24,25]. Radial measurements by Gessler et al [10] on 95-year old beech trees revealed a constancy up to 60 mm depth.…”

Section: Discussionmentioning

confidence: 91%

Radial distribution of sap flux density in trunks of a mature beech stand

Lüttschwager

Remus

2007

Ann. For. Sci.

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-In a mature beech stand located in north-eastern Germany, xylem sap flux measurements were continuously performed during the 2002−2004 growing seasons. Ten representative trunks were studied using heated thermal dissipation probes. The measurements aimed at identifying principles governing radial profiles of xylem flux in beech trunks. The measurements were taken up to a trunk depth of 132 mm. The sap flow density in the pericambial xylem was found to vary among trees of different diameters, but was not considerably smaller in suppressed trees. A model for the radial distribution of sap flux density was formulated relating trunk radius and sap flow density. The model takes into account different trunk diameter. About 90% of the sap flux was found to occur in the outer two fifths of the trunk. Using this model, an adequate estimate of transpiration can be achieved at tree and stand level, even when the sap flux measurements are restricted to the outer trunk sectors. Les mesures ont été réalisées jusqu'à une profondeur de 132 mm. La densité de flux de sève du xylème de la zone cambiale variait d'arbre en arbre en fonction du diamètre, mais cette densité ne diminuait pas sensiblement dans les arbres dominés. Un modèle de distribution radiale de la densité de flux de sève a été mis au point dans lequel le diamètre du tronc et la densité du flux de sève sont mis en relation. Le modèle prend en considération les arbres ayant des troncs de diamètres différents. Environ 90 % de l'eau circule dans les deux cinquièmes extérieurs du tronc. De cette façon, il est possible de calculer de manière suffisamment exacte la transpiration de l'arbre ou du peuplement tout entier, même si les mesures du flux de sève se limitent à la zone externe du tronc. densité de flux de sève / modèle radial / hêtre

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Section: Discussionmentioning

confidence: 91%

Radial distribution of sap flux density in trunks of a mature beech stand

Lüttschwager

Remus

2007

Ann. For. Sci.

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“…This is consistent with the observation of Sperry, Donnelly & Tyree (1988) that hydraulic conductance may be circumferentially heterogeneous as a result of embolism in sugar maple, but contrasts with the reports of Granier (1987a) and Schulze et al (1985) that sap flow does not vary substantially around the circumference of tree stems in the field. Edwards & Booker (1984) noted radial variation in sap velocity, and this may also have implications for quantitative determinations of sap flow .…”

Section: Sap-flow Sensor Functionmentioning

confidence: 87%

“…Although the potential accuracy of sap-flow sensors is well established (Schulze et al 1985;Dugas 1990), other aspects of their interpretation and analysis remain unclear. Outstanding issues include the significance of longitudinal temperature gradients that may confound the signal of some designs (Cermak & Kucera 1981), the possibility that circumferential or radial heterogeneity in flow may create errors in scaling flux density to the whole tree (Edwards & Booker 1984), and the magnitude of the time lag between sap flow and transpiration (Schulze et al 1985).…”

Section: Introductionmentioning

confidence: 99%

Three Methods for Monitoring the Gas Exchange of Individual tree Canopies: Ventilated-Chamber, Sap-Flow and Penman-Monteith Measurements on Evergreen Oaks

Goulden¹,

Field²

1994

Functional Ecology

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“…According to Edwards and Booker (1984), the farthest penetration of a dye tracer in living trees was found in the longitudinal direction through the outermost growth rings of sapwood. In this study it was found that the movement of the dye solution in the cross sectional direction was less than 1/10 compared to that in the longitudinal direction.…”

Section: Discussionmentioning

confidence: 99%

“…In living trees, dye tracers have been used to investigate the sap flow along the trunk (Edwards and Booker 1984;Zimmermann 1983). …”

Section: Introductionmentioning

confidence: 99%

Eine Methode zur Bestimmung des Fliessverhaltens von flüssigem Wasser im Holz während des Trocknens unter Anwendung eines fluoreszierenden Farbstofftracers

2010

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A novel procedure for the evaluation of liquid water flow during the drying of wood is described. The method is based on the movement of a fluorescent dye solution in liquid water. The addition of the dye solution produced a clear trace inside the wood, the length and direction of which were directly related to the flow of liquid water. A comparison of the results obtained with image analysis using UV illumination and measurement of the reflectance spectrum of wood showed that image analysis is appropriate and accurate enough for the determination of the trace of the dye solution. The trace of the dye solution can be determined from the images of the cross sectional samples of wood in all three main directions.

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Radial Variation in the Axial Conductivity ofPopulusand its Significance in Heat Pulse Velocity Measurement

Cited by 46 publications

References 10 publications

Radial distribution of sap flux density in trunks of a mature beech stand

Radial distribution of sap flux density in trunks of a mature beech stand

Three Methods for Monitoring the Gas Exchange of Individual tree Canopies: Ventilated-Chamber, Sap-Flow and Penman-Monteith Measurements on Evergreen Oaks

Eine Methode zur Bestimmung des Fliessverhaltens von flüssigem Wasser im Holz während des Trocknens unter Anwendung eines fluoreszierenden Farbstofftracers

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