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Journal articles

Radial profiles of sap flow with increasing tree size in maritime pine

Abstract : We investigated the radial variation of sap flow within sapwood below the live crown in relation to tree size in 10-, 32-, 54- and 91-year-old maritime pine stands (Pinus pinaster Ait.). Radial variations were determined with two thermal dissipation sensors; one measured sap flux in the outer 20 mm of the xylem (J(ref)), whereas the other was moved radially across the sapwood in 20-mm increments to measure sap flux at multiple depths (J(i)). For all tree sizes, sap flow ratios (R-i = J(i)J(ref)(-1))declined with increasing sapwood depth, but the decrease was steeper in trees with large diameters. Correction factors (C) were calculated to extrapolate J(ref) for an estimate of whole-tree sap flux. A negative linear relationship was established between stem diameter and C, the latter ranging from 0.6 to 1.0. We found that neglecting these radial corrections in 10-, 32-, 54- and 91-year-old trees would lead to overestimation of stand transpiration by 4, 14, 26 and 47%, respectively. Therefore, it is necessary to account for the differential radial profiles of sap flow in relation to tree size when comparing tree transpiration and hydraulic properties among trees differing in size
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Submitted on : Monday, June 1, 2020 - 1:52:40 AM
Last modification on : Monday, August 9, 2021 - 5:42:02 PM


  • HAL Id : hal-02682830, version 1
  • PRODINRA : 73895
  • WOS : 000224970700011



Sylvain Delzon, Michel Sartore, André Granier, Denis Loustau. Radial profiles of sap flow with increasing tree size in maritime pine. Tree Physiology, Oxford University Press (OUP): Policy B - Oxford Open Option B, 2004, 24 (11), pp.1285-1293. ⟨hal-02682830⟩



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