An analysis of the sensitivity of sap flux to soil and plant variables assessed for an Australian woodland using a soil-plant-atmosphere model

Functional Plant Biology : FPB
Melanie ZeppelDerek Eamus

Abstract

Daily and seasonal patterns of tree water use were measured for the two dominant tree species, Angophora bakeri E.C.Hall (narrow-leaved apple) and Eucalyptus sclerophylla (Blakely) L.A.S. Johnson & Blaxell (scribbly gum), in a temperate, open, evergreen woodland using sap flow sensors, along with information about soil, leaf, tree and micro-climatological variables. The aims of this work were to: (a) validate a soil-plant-atmosphere (SPA) model for the specific site; (b) determine the total depth from which water uptake must occur to achieve the observed rates of tree sap flow; (c) examine whether the water content of the upper soil profile was a significant determinant of daily rates of sap flow; and (d) examine the sensitivity of sap flow to several biotic factors. It was found that: (a) the SPA model was able to accurately replicate the hourly, daily and seasonal patterns of sap flow; (b) water uptake must have occurred from depths of up to 3 m; (c) sap flow was independent of the water content of the top 80 cm of the soil profile; and (d) sap flow was very sensitive to the leaf area of the stand, whole tree hydraulic conductance and the critical water potential of the leaves, but insensitive to stem capacitance and increase...Continue Reading

References

Nov 13, 2004·The American Naturalist·Amilcare PorporatoIgnacio Rodriguez-Iturbe
Nov 4, 2006·Plant, Cell & Environment·Rosie A FisherPatrick Meir
Dec 1, 1996·Oecologia·J CanadellE-D Schulze
Nov 1, 1996·Oecologia·R B JacksonE D Schulze

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Citations

Sep 19, 2017·Global Change Biology·Rosie A FisherPaul R Moorcroft
Mar 25, 2010·Tree Physiology·Nathan G PhillipsDavid T Tissue
May 17, 2011·Tree Physiology·Remko A DuursmaRoss E McMurtrie
Feb 11, 2014·International Journal of Biometeorology·Lixin ChenTonggang Zha

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