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


O'Grady, AP and Eyles, A and Worledge, D and Battaglia, M, Seasonal patterns of foliage respiration in dominant and suppressed Eucalyptus globulus canopies, Tree Physiology, 30, (8) pp. 957-968. ISSN 0829-318X (2010) [Refereed Article]

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DOI: doi:10.1093/treephys/tpq057


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 ”ĘC, 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 Details

Item Type:Refereed Article
Keywords:Eucalyptus non-structural carbohydrates size class distributions thermal acclimation
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree nutrition and physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Forestry not elsewhere classified
UTAS Author:O'Grady, AP (Dr Anthony O'Grady)
UTAS Author:Eyles, A (Dr Alieta Eyles)
ID Code:63248
Year Published:2010
Web of Science® Times Cited:15
Deposited By:Agricultural Science
Deposited On:2010-04-26
Last Modified:2011-05-03

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