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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 ( Ψ  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.

Inter- and intra-specific variation in nocturnal water transport in Eucalyptu s