2004
DOI: 10.1093/treephys/24.3.241
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Assessing variation in the radial profile of sap flux density in Pinus species and its effect on daily water use

Abstract: We monitored sap flux density (v) diurnally in nine mature southeastern pine (Pinus spp.) trees with a thermal dissipation probe that spanned the sapwood radius. We found the expected pattern of high v near the cambium and decreasing v with depth toward the center of the tree; however, the pattern was not constant within a day or between trees. Radial profiles of trees were steeper earlier in the day and became less steep later in the day. As a result, time-dependent changes in the shape of the radial profile … Show more

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Cited by 187 publications
(163 citation statements)
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“…Assuming a general pattern according to the Weibull function, the observations for all three trees are similarly described. The Weibull function of response is compatible with the reports of Nadezhdina et al [20], Ford et al [3] and Hunt and Beadle [12] who measured the radial variation in flow within the xylem in detail in several different tree species. Altogether, the peak of the Weibull function and the peak of SFD day at intervals of 20 mm occurred in a different xylem depth.…”
Section: Potential Generalization Of Radial Patterns Using the Weibulsupporting
confidence: 89%
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“…Assuming a general pattern according to the Weibull function, the observations for all three trees are similarly described. The Weibull function of response is compatible with the reports of Nadezhdina et al [20], Ford et al [3] and Hunt and Beadle [12] who measured the radial variation in flow within the xylem in detail in several different tree species. Altogether, the peak of the Weibull function and the peak of SFD day at intervals of 20 mm occurred in a different xylem depth.…”
Section: Potential Generalization Of Radial Patterns Using the Weibulsupporting
confidence: 89%
“…According to this analysis, the SFD day reaches a maximum just behind of the cambium layer and then decreases exponentially as suggested by Nadezhdina et al [20] and Ford et al [3]. Furthermore, the Weibull function enables estimation of SFD day deeper than deepest sensor insertion (60 mm).…”
Section: Estimate Of Radial Patterns Of Sfd Day Using Weibull Functiomentioning
confidence: 56%
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“…Diurnal values of transpiration of individual trees are then a stratified random sample, the transpiration in mm being calculated from them via the basal area of the stand [5]. This procedure, however, may involve errors if (i) the measurements are only taken in the pericambial xylem and sap flux occurs in deeper xylem and (ii) the radial distribution of SFD varies substantially among trees with different trunk diameter [9]. For example, Granier et al [14] found larger SFD in the xylem of dominant beech trees as compared to smaller trees.…”
Section: Discussionmentioning
confidence: 99%
“…Ford et al found in pine trees that radial profiles of sap flow density were steeper earlier in the day and less steep later. They hypothesized that water moving in the inner sapwood requires a larger water potential gradient because of a smaller hydraulic conductivity [9].…”
Section: Introductionmentioning
confidence: 99%