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Forest system hydraulic conductance
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Forest system hydraulic conductance
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Journal Article
Forest system hydraulic conductance
2022
Overview
• Soil–leaf hydraulic conductance determines canopy–atmosphere coupling in vegetation models, but it is typically derived from ex-situ measurements of stem segments and soil samples. Using a novel approach, we derive robust in-situ estimates for whole-tree conductance (k
tree), ‘functional’ soil conductance (k
soil), and ‘system’ conductance (k
system, water table to canopy), at two climatically different tropical rainforest sites.
• Hydraulic ‘functional rooting depth’, determined for each tree using profiles of soil water potential (Ψsoil) and sap flux data, enabled a robust determination of k
tree and k
soil. k
tree was compared across species, size classes, seasons, height above nearest drainage (HAND), two field sites, and to alternative representations of k
tree; k
soil was analysed with respect to variations in site, season and HAND.
• k
tree was lower and changed seasonally at the site with higher vapour pressure deficit (VPD) and rainfall; k
tree differed little across species but scaled with tree circumference; r
soil (1/k
soil) ranged from 0 in the wet season to 10× less than r
tree (1/k
tree) in the dry season.
• VPD and not rainfall may influence plot-level k; leaf water potentials and sap flux can be used to determine k
tree, k
soil and k
system; Ψsoil profiles can provide mechanistic insights into ecosystem-level water fluxes.
