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A continental-scale assessment of variability in leaf traits: within species, across sites and between seasons.

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Title: A continental-scale assessment of variability in leaf traits: within species, across sites and between seasons.
Authors: Bloomfield, KJ
Cernusak, LA
Eamus, D
Ellsworth, DS
Prentice, IC
Wright, IJ
Boer, MM
Bradford, MG
Cale, P
Cleverly, J
Egerton, JJG
Evans, BJ
Hayes, LS
Hutchinson, MF
Liddell, MJ
Macfarlane, C
Meyer, WS
Prober, SM
Togashi, HF
Wardlaw, T
Zhu, L
Atkin, OK
Item Type: Journal Article
Abstract: Plant species show considerable leaf trait variability that should be accounted for in dynamic global vegetation models (DGVMs). In particular, differences in the acclimation of leaf traits during periods more and less favourable to growth have rarely been examined. We conducted a field study of leaf trait variation at seven sites spanning a range of climates and latitudes across the Australian continent; 80 native plant species were included. We measured key traits associated with leaf structure, chemistry and metabolism during the favourable and unfavourable growing seasons. Leaf traits differed widely in the degree of seasonal variation displayed. Leaf mass per unit area (Ma) showed none. At the other extreme, seasonal variation accounted for nearly a third of total variability in dark respiration (Rdark). At the non‐tropical sites, carboxylation capacity (Vcmax) at the prevailing growth temperature was typically higher in summer than in winter. When Vcmax was normalized to a common reference temperature (25°C), however, the opposite pattern was observed for about 30% of the species. This suggests that metabolic acclimation is possible, but far from universal. Intraspecific variation—combining measurements of individual plants repeated at contrasting seasons, different leaves from the same individual, and multiple conspecific plants at a given site—dominated total variation for leaf metabolic traits Vcmax and Rdark. By contrast, site location was the major source of variation (53%) for Ma. Interspecific trait variation ranged from only 13% of total variation for Vcmax up to 43% for nitrogen content per unit leaf area. These findings do not support a common practice in DGVMs of assigning fixed leaf trait values to plant functional types. Trait‐based models should allow for interspecific differences, together with spatial and temporal plasticity in leaf structural, chemical and metabolic traits.
Issue Date: 6-Apr-2018
Date of Acceptance: 9-Feb-2018
URI: http://hdl.handle.net/10044/1/59030
DOI: https://dx.doi.org/10.1111/1365-2435.13097
ISSN: 0269-8463
Publisher: Wiley
Start Page: 1
End Page: 15
Journal / Book Title: Functional Ecology
Volume: 2018
Copyright Statement: © 2018 The Authors. Functional Ecology © 2018 British Ecological Society. This is the accepted version of the following article: Bloomfield KJ, Cernusak LA, Eamus D, et al. A continental‐scale assessment of variability in leaf traits: Within species, across sites and between seasons. Funct Ecol. 2018;00:1–15. which has been published in final form at https://doi.org/10.1111/1365-2435.13097
Sponsor/Funder: AXA Research Fund
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
Keywords: 06 Biological Sciences
05 Environmental Sciences
Publication Status: Published
Online Publication Date: 2018-03-15
Appears in Collections:Department of Life Sciences
Faculty of Natural Sciences