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Optimal stomatal behaviour around the world

journal contribution
posted on 08.08.2019, 00:00 by Y-S Lin, BE Medlyn, RA Duursma, IC Prentice, H Wang, S Baig, D Eamus, VR De Dios, P Mitchell, DS Ellsworth
Stomatal conductance (g s) 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 g s in predictions of global water and carbon cycle changes, a global-scale database and an associated globally applicable model of g s that allow predictions of stomatal behaviour are lacking. Here, we present a database of globally distributed g s obtained in the field for a wide range of plant functional types (PFTs) and biomes. We find that stomatal behaviour differs among PFTs according to their marginal carbon cost of water use, as predicted by the theory underpinning the optimal stomatal model and the leaf and wood economics spectrum. We also demonstrate a global relationship with climate. These findings provide a robust theoretical framework for understanding and predicting the behaviour of g s 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. © 2015 Macmillan Publishers Limited. All rights reserved.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

5

Issue

5

Start Page

459

End Page

464

Number of Pages

6

eISSN

1758-6798

ISSN

1758-678X

Publisher

Nature Publishing Group, UK

Peer Reviewed

Yes

Open Access

No

Acceptance Date

16/01/2015

Era Eligible

Yes

Journal

Nature Climate Change

Exports