The concept of iso- vs. anisohydry has been used to describe the stringency of stomatal regulation of plant water potential (ψ). However, metrics that accurately and consistently quantify species’ operating ranges along a continuum of iso- to anisohydry have been elusive. Additionally, most approaches to quantifying iso/anisohydry require labour-intensive measurements during prolonged drought. We evaluated new and previously developed metrics of stringency of stomatal regulation of ψ during soil drying in eight woody species and determined whether easily-determined leaf pressure–volume traits could serve as proxies for their degree of iso- vs. anisohydry. Two metrics of stringency of stomatal control of ψ, (1) a ‘hydroscape’ incorporating the landscape of ψ over which stomata control ψ, and (2) the slope of the daily range of ψ as pre-dawn ψ declined, were strongly correlated with each other and with the leaf osmotic potential at full and zero turgor derived from pressure–volume curves. � 2016 John Wiley & Sons Ltd/CNRS
USDA Forest Service, Pacific Northwest Research Station, Corvallis, OR, United States; Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, United States; Department of Botany, University of Wisconsin-Madison, Madison, WI, United States; Department of Biology, Western Oregon University, Monmouth, OR, United States
Recommended Citation:
Meinzer F.C.,Woodruff D.R.,Marias D.E.,et al. Mapping ‘hydroscapes’ along the iso- to anisohydric continuum of stomatal regulation of plant water status[J]. Ecology Letters,2016-01-01,19(11)