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Seasonal patterns of foliage respiration in dominant and suppressed Eucalyptus globulus canopies

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O'Grady, AP and Eyles, A and Worlege, D and Battaglia, M (2010) Seasonal patterns of foliage respiration in dominant and suppressed Eucalyptus globulus canopies. Tree Physiology, 30. pp. 957-968. ISSN 0829-318X

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Abstract

We examined spatial and temporal dynamics of foliage respiration in canopies of dominant and suppressed Eucalyptus globulus trees to better understand processes regulating foliage respiration in a young fast-growing stand. Temperature response functions and seasonal measures of respiration (measured at a reference temperature of 15 °C, R15) were studied for ∼1 year to (i) examine controls on respiration as a function of canopy position, foliar nitrogen and non-structural carbohydrate concentrations and (ii) assess the capacity for thermal acclimation within E. globulus canopies. The short-term temperature response of respiration varied both with canopy position and seasonally. Area-based R15 measurements declined with increasing canopy depth and were strongly related to foliar N concentrations, especially in upper-canopy positions. R15 was negatively correlated with the average temperature of the preceding 14 days, a pattern consistent with thermal acclimation. In suppressed canopies, R15 was higher than that at similar canopy heights in dominant trees. Similarly, foliar concentrations of non-structural carbohydrates were also relatively higher in suppressed canopies than dominant canopies, providing support for a substrate- based model of leaf respiration. Our data highlight the dynamic nature of foliar respiration within E. globulus canopies, which contrasts with the generally simplistic representation of respiration within most process-based models.

Item Type: Article
Keywords: Eucalyptus, non-structural carbohydrates, size class distributions, thermal acclimation.
Journal or Publication Title: Tree Physiology
Page Range: pp. 957-968
ISSN: 0829-318X
Identification Number - DOI: 10.1093/treephys/tpq057
Additional Information: Copyright © 2010 Oxford University Press
Date Deposited: 23 Feb 2012 02:37
Last Modified: 14 Oct 2013 23:09
URI: http://eprints.utas.edu.au/id/eprint/12702
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