Optimal stomatal behaviour around the world

Yan-Shih Lin, Belinda E. Medlyn, Remko A. Duursma, Colin Prentice, Han Wang, Sofia Baig, Derek Eamus, Victor Resco de Dios, Patrick Mitchell, David S. Ellsworth, Teis Nørgaard Mikkelsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stomatal conductance (gs) is a key land-surface attribute as it links transpiration, the dominant component of global land evapotranspiration, and photosynthesis, the driving force of the global carbon cycle. Despite the pivotal role of gs in predictions of global water and carbon cycle changes, a globalscale database and an associated globally applicable model of gs that allow predictions of stomatal behaviour are lacking. Here,we present a database of globally distributed gs obtained in the field for a wide range of plant functional types (PFTs) and biomes. We find that stomatal behaviour diers among PFTs according to their marginal carbon cost of water use, as predicted by the theory underpinning the optimal stomatal model1 and the leaf and wood economics spectrum2,3.We also demonstrate a global relationship with climate. These findings provide a robust theoretical framework for understanding and predicting the behaviour of gs across biomes and across PFTs that can be applied to regional, continental and global-scale modelling of ecosystem productivity, energy balance and ecohydrological processes in a future changing climate.
Original languageEnglish
JournalNature Climate Change
Volume5
Issue number5
Pages (from-to)459-464
ISSN1758-678X
DOIs
Publication statusPublished - 2015

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