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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 M., Richards, Anna E., Cook, Garry D., Downes, Geoffrey M., Gill, Warwick and Baker, Patrick J. (2014). The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica. Trees: structure and function,28(1):31-40.

Document type: Journal Article
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IRMA ID 82057923xPUB626
Title The number of days on which increment occurs is the primary determinant of annual ring width in Callitris intratropica
Author Drew, David M.
Richards, Anna E.
Cook, Garry D.
Downes, Geoffrey M.
Gill, Warwick
Baker, Patrick J.
Journal Name Trees: structure and function
Publication Date 2014
Volume Number 28
Issue Number 1
ISSN 0931-1890   (check CDU catalogue  open catalogue search in new window)
Scopus ID 2-s2.0-84892888492
Start Page 31
End Page 40
Total Pages 10
Place of Publication Germany
Publisher Springer
HERDC Category C1 - Journal Article (DIISR)
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.
Keywords Tropical
Dendroclimatology
Drought
Cambium
Xylem
Dendrometer
Cypress pine
Savanna
DOI http://dx.doi.org/10.1007/s00468-013-0927-4   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Thu, 07 Aug 2014, 17:07:13 CST