Ecophysiology of Acacia species in wet–dry tropical plantations

A. Eyles, Paul Drake, L.T. Quang, P.V. Bon, D. Mendham, D. White, K.T. Dat, P.T. Dung, C. Beadle

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    © 2015 NISC (Pty) Ltd. Selected tropical Acacia species are used extensively for short-rotation plantation forestry in many parts of Asia and, to a limited degree, in Australia. We explored leaf-level photosynthetic activity and leaf water potential (Ψleaf) of three field-grown Acacia tree species (aged between 7 and 18 months) in contrasting wet–dry tropical plantations in southern Vietnam and northern Australia. Light-saturated photosynthetic rate (A1500) declined throughout the morning and early afternoon in the dry season; in the wet season, levels remained high and relatively constant throughout most of the day. Maximum daily A1500 at 09:00 ranged from 22.2 μmol m−2 s−1 in the wet to 10.4 μmol m−2 s−1 in the dry season. At both locations, trees were able to extract soil water such that pre-dawn leaf water potential (Ψpd) remained>−1.5 MPa even at the end of the dry season. Stomatal conductance to water vapour (gs) did not respond to decreasing Ψleaf during the wet season but was sensitive to changes in Ψleaf in the dry season. Species comparisons of the relationships between A1500 and Ψleaf revealed different strategies to balance carbon uptake and water loss in a wet–dry environment. Acacia crassicarpa and A. mangium regulated Ψleaf to a greater extent than the A. mangium×A. auriculiformis hybrid such that ∆Ψleaf (determined as Ψpd−midday Ψleaf) was unaffected by season. This result suggests that the hydraulic regulation of tree water status varies amongst young tropical Acacia species. From a management perspective, for Acacia species that tend to strongly regulate water loss in environments with an extended dry season, overall productivity at the end of a rotation may be less than for species that prioritise carbon gain.
    Original languageEnglish
    Pages (from-to)287-296
    JournalSouthern Forests
    Volume77
    Issue number4
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    ecophysiology
    Acacia
    plantation
    plantations
    dry season
    leaves
    leaf water potential
    wet season
    Acacia crassicarpa
    plantation forestry
    Acacia mangium
    water
    carbon
    water vapor
    Vietnam
    carbon balance
    stomatal conductance
    fluid mechanics
    soil water
    uptake mechanisms

    Cite this

    Eyles, A., Drake, P., Quang, L. T., Bon, P. V., Mendham, D., White, D., ... Beadle, C. (2015). Ecophysiology of Acacia species in wet–dry tropical plantations. Southern Forests, 77(4), 287-296. https://doi.org/10.2989/20702620.2015.1063030
    Eyles, A. ; Drake, Paul ; Quang, L.T. ; Bon, P.V. ; Mendham, D. ; White, D. ; Dat, K.T. ; Dung, P.T. ; Beadle, C. / Ecophysiology of Acacia species in wet–dry tropical plantations. In: Southern Forests. 2015 ; Vol. 77, No. 4. pp. 287-296.
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    abstract = "{\circledC} 2015 NISC (Pty) Ltd. Selected tropical Acacia species are used extensively for short-rotation plantation forestry in many parts of Asia and, to a limited degree, in Australia. We explored leaf-level photosynthetic activity and leaf water potential (Ψleaf) of three field-grown Acacia tree species (aged between 7 and 18 months) in contrasting wet–dry tropical plantations in southern Vietnam and northern Australia. Light-saturated photosynthetic rate (A1500) declined throughout the morning and early afternoon in the dry season; in the wet season, levels remained high and relatively constant throughout most of the day. Maximum daily A1500 at 09:00 ranged from 22.2 μmol m−2 s−1 in the wet to 10.4 μmol m−2 s−1 in the dry season. At both locations, trees were able to extract soil water such that pre-dawn leaf water potential (Ψpd) remained>−1.5 MPa even at the end of the dry season. Stomatal conductance to water vapour (gs) did not respond to decreasing Ψleaf during the wet season but was sensitive to changes in Ψleaf in the dry season. Species comparisons of the relationships between A1500 and Ψleaf revealed different strategies to balance carbon uptake and water loss in a wet–dry environment. Acacia crassicarpa and A. mangium regulated Ψleaf to a greater extent than the A. mangium×A. auriculiformis hybrid such that ∆Ψleaf (determined as Ψpd−midday Ψleaf) was unaffected by season. This result suggests that the hydraulic regulation of tree water status varies amongst young tropical Acacia species. From a management perspective, for Acacia species that tend to strongly regulate water loss in environments with an extended dry season, overall productivity at the end of a rotation may be less than for species that prioritise carbon gain.",
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    Eyles, A, Drake, P, Quang, LT, Bon, PV, Mendham, D, White, D, Dat, KT, Dung, PT & Beadle, C 2015, 'Ecophysiology of Acacia species in wet–dry tropical plantations' Southern Forests, vol. 77, no. 4, pp. 287-296. https://doi.org/10.2989/20702620.2015.1063030

    Ecophysiology of Acacia species in wet–dry tropical plantations. / Eyles, A.; Drake, Paul; Quang, L.T.; Bon, P.V.; Mendham, D.; White, D.; Dat, K.T.; Dung, P.T.; Beadle, C.

    In: Southern Forests, Vol. 77, No. 4, 2015, p. 287-296.

    Research output: Contribution to journalArticle

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    T1 - Ecophysiology of Acacia species in wet–dry tropical plantations

    AU - Eyles, A.

    AU - Drake, Paul

    AU - Quang, L.T.

    AU - Bon, P.V.

    AU - Mendham, D.

    AU - White, D.

    AU - Dat, K.T.

    AU - Dung, P.T.

    AU - Beadle, C.

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    N2 - © 2015 NISC (Pty) Ltd. Selected tropical Acacia species are used extensively for short-rotation plantation forestry in many parts of Asia and, to a limited degree, in Australia. We explored leaf-level photosynthetic activity and leaf water potential (Ψleaf) of three field-grown Acacia tree species (aged between 7 and 18 months) in contrasting wet–dry tropical plantations in southern Vietnam and northern Australia. Light-saturated photosynthetic rate (A1500) declined throughout the morning and early afternoon in the dry season; in the wet season, levels remained high and relatively constant throughout most of the day. Maximum daily A1500 at 09:00 ranged from 22.2 μmol m−2 s−1 in the wet to 10.4 μmol m−2 s−1 in the dry season. At both locations, trees were able to extract soil water such that pre-dawn leaf water potential (Ψpd) remained>−1.5 MPa even at the end of the dry season. Stomatal conductance to water vapour (gs) did not respond to decreasing Ψleaf during the wet season but was sensitive to changes in Ψleaf in the dry season. Species comparisons of the relationships between A1500 and Ψleaf revealed different strategies to balance carbon uptake and water loss in a wet–dry environment. Acacia crassicarpa and A. mangium regulated Ψleaf to a greater extent than the A. mangium×A. auriculiformis hybrid such that ∆Ψleaf (determined as Ψpd−midday Ψleaf) was unaffected by season. This result suggests that the hydraulic regulation of tree water status varies amongst young tropical Acacia species. From a management perspective, for Acacia species that tend to strongly regulate water loss in environments with an extended dry season, overall productivity at the end of a rotation may be less than for species that prioritise carbon gain.

    AB - © 2015 NISC (Pty) Ltd. Selected tropical Acacia species are used extensively for short-rotation plantation forestry in many parts of Asia and, to a limited degree, in Australia. We explored leaf-level photosynthetic activity and leaf water potential (Ψleaf) of three field-grown Acacia tree species (aged between 7 and 18 months) in contrasting wet–dry tropical plantations in southern Vietnam and northern Australia. Light-saturated photosynthetic rate (A1500) declined throughout the morning and early afternoon in the dry season; in the wet season, levels remained high and relatively constant throughout most of the day. Maximum daily A1500 at 09:00 ranged from 22.2 μmol m−2 s−1 in the wet to 10.4 μmol m−2 s−1 in the dry season. At both locations, trees were able to extract soil water such that pre-dawn leaf water potential (Ψpd) remained>−1.5 MPa even at the end of the dry season. Stomatal conductance to water vapour (gs) did not respond to decreasing Ψleaf during the wet season but was sensitive to changes in Ψleaf in the dry season. Species comparisons of the relationships between A1500 and Ψleaf revealed different strategies to balance carbon uptake and water loss in a wet–dry environment. Acacia crassicarpa and A. mangium regulated Ψleaf to a greater extent than the A. mangium×A. auriculiformis hybrid such that ∆Ψleaf (determined as Ψpd−midday Ψleaf) was unaffected by season. This result suggests that the hydraulic regulation of tree water status varies amongst young tropical Acacia species. From a management perspective, for Acacia species that tend to strongly regulate water loss in environments with an extended dry season, overall productivity at the end of a rotation may be less than for species that prioritise carbon gain.

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