Oecologia

, Volume 177, Issue 4, pp 1171–1181

Stomatal structure and physiology do not explain differences in water use among montane eucalypts

  • Mana Gharun
  • Tarryn L. Turnbull
  • Sebastian Pfautsch
  • Mark A. Adams
Physiological ecology - Original research

Abstract

Understanding the regulation of water use at the whole-tree scale is critical to advancing the utility of physiological ecology, for example in its role in predictive hydrology of forested catchments. For three eucalypt species that dominate high-elevation catchments in south-eastern Australia, we examined if whole-tree water use could be related to three widely discussed regulators of water use: stomatal anatomy, sensitivity of stomata [i.e. stomatal conductance (gs)] to environmental influences, and sapwood area. While daily tree water use varied sixfold among species, sap velocity and sapwood area varied in parallel. Combined, stomatal structure and physiology could not explain differences in species-specific water use. Species which exhibited the fastest (Eucalyptus delegatensis) and slowest (Eucalyptus pauciflora) rates of water use both exhibited greater capacity for physiological control of gs [indicated by sensitivity to vapour pressure deficit (VPD)] and a reduced capacity to limit gs anatomically [indicated by greater potential gs (gmax)]. Conversely, gs was insensitive to VPD and gmax was lowest for Eucalyptus radiata, the species showing intermediate rates of water use. Improved knowledge of stomatal anatomy will help us to understand the capacity of species to regulate leaf-level water loss, but seems likely to remain of limited use for explaining rates of whole-tree water use in montane eucalypts at the catchment scale.

Keywords

Ecophysiology Sap flow Stomatal conductance Cuticular ledge Vapour pressure deficit 

Supplementary material

442_2015_3252_MOESM1_ESM.doc (384 kb)
Supplementary material 1 (DOC 384 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Mana Gharun
    • 1
  • Tarryn L. Turnbull
    • 1
  • Sebastian Pfautsch
    • 2
  • Mark A. Adams
    • 1
  1. 1.Faculty of Agriculture and EnvironmentUniversity of SydneyEveleighAustralia
  2. 2.Hawkesbury Institute for the EnvironmentUniversity of Western SydneyRichmondAustralia

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