Open Access Repository

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

Downloads

Downloads per month over past year

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

[img] PDF
O'Grady_et_al...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

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: 15 Sep 2017 01:06
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP