Inter- and intra-specific variation in nocturnal water transport in Eucalyptus

To identify environmental and biological drivers of nocturnal vapour exchange, we quantified intra-annual, intra- and inter-specific variation in nocturnal water transport among ecologically diverse Eucalyptus species. We measured sap flux (J(s)) and leaf physiology (leaf surface conductance (g(s)),...

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Bibliographic Details
Published in:Tree physiology 2010-05, Vol.30 (5), p.586-596
Main Authors: Phillips, Nathan G, Lewis, James D, Logan, Barry A, Tissue, David T
Format: Article
Language:English
Subjects:
Biological Transport - physiology
Circadian Rhythm
environmental factors
Eucalyptus
Eucalyptus - classification
Eucalyptus - physiology
gas exchange
leaf surface conductance
leaves
meteorological data
nocturnal water use
Plant Leaves - physiology
plant-water relations
sap flow
seasonal variation
species differences
Species Specificity
stomatal conductance
transpiration
tree physiology
trees
vapor pressure
Water - metabolism
wind speed
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Summary:To identify environmental and biological drivers of nocturnal vapour exchange, we quantified intra-annual, intra- and inter-specific variation in nocturnal water transport among ecologically diverse Eucalyptus species. We measured sap flux (J(s)) and leaf physiology (leaf surface conductance (g(s)), transpiration (E) and water potential (psi(l))) in three to five trees of eight species. Over 1 year, nocturnal J(s) (J(s,n)) contributed 5–7% of total J(s) in the eight species. The principal environmental driver of J(s,n) was the product of atmospheric vapour pressure deficit (D) and wind speed (U). Selected observations suggest that trees with higher proportions of young foliage may exhibit greater J(s,n) and nocturnal g(s) (g(s,n)). Compared with other tree taxa, nocturnal water use in Eucalyptus was relatively low and more variable within than between species, suggesting that (i) Eucalyptus as a group exerts strong nocturnal stomatal control over water loss and (ii) prediction of nocturnal flux in Eucalyptus may depend on simultaneous knowledge of intra-specific tree traits and nocturnal atmospheric conditions.
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/tpq009