Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

M Ngugi; Mark A Hunt; D Doley; P Ryan; P Dart

doi:10.1016/j.foreco.2004.01.027

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Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

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Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland

M Ngugi, Mark A Hunt, D Doley, P Ryan and P Dart

Forest Ecology and Management, Vol.193(1-2), pp.141-156

2004

DOI: https://doi.org/10.1016/j.foreco.2004.01.027

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Abstract

Forestry Sciences

boundary line analysis

drought tolerance

forest productivity

net photosynthetic rates

phenomenological model

stomatal conductance

Responses of stomatal conductance (gs) and net photosynthesis (A) to changes in soil water availability, photosynthetic photon flux density (Q), air temperature (T) and leaf-to-air vapour pressure deficit (D) were investigated in 4-year-old trees of a dry inland provenance of Eucalyptus argophloia Blakely, and two dry inland provenances (Coominglah and Hungry Hills) and a humid coastal provenance (Wolvi) of Eucalyptus cloeziana F. Muell. between April 2001 and April 2002 in southeast Queensland, Australia. There were minimal differences in A, gs and water relations variables among the coastal and inland provenances of E. cloeziana but large differences between E. argophloia and E. cloeziana. E. argophloia and to a lesser extent the Hungry Hills (inland) provenance of E. cloeziana maintained relatively higher pre-dawn water potential (Ïˆpd) during the dry season suggesting possible access to water at depth. Simple phenomenological models of stomatal conductance as a function of Q, T and D explained 60% of variation in gs in E. cloeziana and more than 75% in E. argophloia, when seasonal effect was incorporated in the model. A Ball-Berry model for net photosynthesis explained between 70 and 80% of observed variation in A in both species. These results have implications in matching the dry and humid provenances of E. cloeziana and E. argophloia to suitable sites in subtropical environments.

Details

Title: Selection of species and provenances for low-rainfall areas: physiological responses of Eucalyptus cloeziana and Eucalyptus argophloia to seasonal conditions in subtropical Queensland
Authors: M Ngugi (Author) - University of Queensland
Mark A Hunt (Author) - Queensland Forestry Research Institute
D Doley (Author) - University of Queensland
P Ryan (Author) - University of Queensland
P Dart (Author) - University of Queensland
Publication details: Forest Ecology and Management, Vol.193(1-2), pp.141-156
Publisher: Elsevier BV
Date published: 2004
DOI: 10.1016/j.foreco.2004.01.027
ISSN: 0378-1127
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449862302621
Output Type: Journal article

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