The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica

David Drew, Anna E Richards, Garry Cook, Geoffrey Downes, Warwick Gill, Patrick Baker

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Dendroclimatology of tropical tree species is an important tool for understanding past climatic variability at low latitudes where long-term weather records are often absent. Despite the growing number of published tropical tree-ring chronologies, however, still little is known of the factors that control annual ring formation in tropical tree species. In this paper we used an endemic Australian conifer, Callitris intratropica, to study the intra-annual dynamics of seasonal growth and xylem formation, and the effects of environmental conditions and competition, on growth ring formation. We combined high-resolution growth and climate monitoring (every 15 min for 2 years) with less frequent cambial sampling. Trees exhibited marked reductions in growth during certain periods within the rainy season when rainfall was not as regular and VPD was high. Overall, we found that ring width was most influenced by the number of days when increment occurred; regardless of how early the growing season began or ended, and by the rates of tracheid production. The effect of competition was also important. Trees growing in dense groves had narrower annual rings (4.6 mm) than trees that were growing in the open (6.7 mm), due to less active cambia, slower rates of xylem production and expansion and more increment days, although the overall growing season duration was also shorter in grove trees.
    Original languageEnglish
    Pages (from-to)31-40
    Number of pages10
    JournalTrees - Structure and Function
    Volume28
    Issue number1
    Early online date23 Aug 2013
    DOIs
    Publication statusPublished - Feb 2014

    Fingerprint

    Callitris
    groves
    Xylem
    xylem
    growth rings
    Growth
    dendroclimatology
    growing season
    seasonal growth
    Coniferophyta
    Chronology
    tree ring
    Weather
    growth retardation
    conifers
    coniferous tree
    chronology
    Climate
    wet season
    weather

    Cite this

    Drew, David ; Richards, Anna E ; Cook, Garry ; Downes, Geoffrey ; Gill, Warwick ; Baker, Patrick. / The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica. In: Trees - Structure and Function. 2014 ; Vol. 28, No. 1. pp. 31-40.
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    title = "The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica",
    abstract = "Dendroclimatology of tropical tree species is an important tool for understanding past climatic variability at low latitudes where long-term weather records are often absent. Despite the growing number of published tropical tree-ring chronologies, however, still little is known of the factors that control annual ring formation in tropical tree species. In this paper we used an endemic Australian conifer, Callitris intratropica, to study the intra-annual dynamics of seasonal growth and xylem formation, and the effects of environmental conditions and competition, on growth ring formation. We combined high-resolution growth and climate monitoring (every 15 min for 2 years) with less frequent cambial sampling. Trees exhibited marked reductions in growth during certain periods within the rainy season when rainfall was not as regular and VPD was high. Overall, we found that ring width was most influenced by the number of days when increment occurred; regardless of how early the growing season began or ended, and by the rates of tracheid production. The effect of competition was also important. Trees growing in dense groves had narrower annual rings (4.6 mm) than trees that were growing in the open (6.7 mm), due to less active cambia, slower rates of xylem production and expansion and more increment days, although the overall growing season duration was also shorter in grove trees.",
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    The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica. / Drew, David; Richards, Anna E; Cook, Garry; Downes, Geoffrey; Gill, Warwick; Baker, Patrick.

    In: Trees - Structure and Function, Vol. 28, No. 1, 02.2014, p. 31-40.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - Drew, David

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    AU - Gill, Warwick

    AU - Baker, Patrick

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    N2 - Dendroclimatology of tropical tree species is an important tool for understanding past climatic variability at low latitudes where long-term weather records are often absent. Despite the growing number of published tropical tree-ring chronologies, however, still little is known of the factors that control annual ring formation in tropical tree species. In this paper we used an endemic Australian conifer, Callitris intratropica, to study the intra-annual dynamics of seasonal growth and xylem formation, and the effects of environmental conditions and competition, on growth ring formation. We combined high-resolution growth and climate monitoring (every 15 min for 2 years) with less frequent cambial sampling. Trees exhibited marked reductions in growth during certain periods within the rainy season when rainfall was not as regular and VPD was high. Overall, we found that ring width was most influenced by the number of days when increment occurred; regardless of how early the growing season began or ended, and by the rates of tracheid production. The effect of competition was also important. Trees growing in dense groves had narrower annual rings (4.6 mm) than trees that were growing in the open (6.7 mm), due to less active cambia, slower rates of xylem production and expansion and more increment days, although the overall growing season duration was also shorter in grove trees.

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