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. 2014 Dec 29;66(5):1303–1315. doi: 10.1093/jxb/eru481

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© The Author 2014. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 11. — Model simulations comparing the relationship between leaf water potential (Ψ_leaf), leaf to air vapour pressure difference (VPD), and stomatal conductance (g _s) when: (A) leaf hydraulic conductance (k _leaf) is positively dependent on transpiration rate (E), based on the empirical relationship observed across the gymnosperm species in the common garden experiment (see Fig. 5) where k _leaf=2.5+3.2×E, and (B) a constant k _leaf based on the y-intercept of the combined gymnosperm data (i.e. k _leaf(0)=2.5). Note that in A, Ψ_leaf remains high as VPD increases, whereas in (B) Ψ_leaf declines substantially with increasing VPD.