Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?

The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequenc...

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Autores principales:	LUSK,CHRISTOPHER H., LE-QUESNE,CARLOS
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2000
Materias:	Araucariaceae conifers dendroecology tree growth tree rings
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013
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spelling	oai:scielo:S0716-078X20000003000132000-11-09Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?LUSK,CHRISTOPHER H.LE-QUESNE,CARLOS Araucariaceae conifers dendroecology tree growth tree rings The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1) than in shade-grown trees (2.6 yrs whorl-1), suggesting a relationship with plant carbon balance. Mean distance between whorls was also sensitive to light environment. The overall result of this effect of light environment on both whorl spacing and production rate was that mean height growth rates were > 50% higher in sun-grown trees (169 mm yr-1) than in shade-grown individuals (111 mm yr-1). Despite the non-annual nature of whorls in the study population, whorl counts may have some potential as a non-invasive method of age estimation in juvenile A. araucana. In both shade- and sun-grown subpopulations, whorl number was a better predictor of stem age than were stem diameter or heightinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.73 n.3 20002000-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013en10.4067/S0716-078X2000000300013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Araucariaceae conifers dendroecology tree growth tree rings
spellingShingle	Araucariaceae conifers dendroecology tree growth tree rings LUSK,CHRISTOPHER H. LE-QUESNE,CARLOS Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
description	The growth of Araucaria araucana, like that of many other conifers, is characterised by the production of a monopodial stem with branch whorls. However, the periodicity of whorl formation in this species has not been subjected to systematic study. We used growth ring counts to determine the frequency of whorl formation in sun- and shade-grown juvenile A. araucana in a montane forest in the Chilean coast range. Whorls were not annual in any of the 35 individuals studied, growth rings outnumbering whorls by a factor of 1.8 to 3.9. The mean interval between successive whorls was significantly shorter in sun-grown (2.1 yrs whorl -1) than in shade-grown trees (2.6 yrs whorl-1), suggesting a relationship with plant carbon balance. Mean distance between whorls was also sensitive to light environment. The overall result of this effect of light environment on both whorl spacing and production rate was that mean height growth rates were > 50% higher in sun-grown trees (169 mm yr-1) than in shade-grown individuals (111 mm yr-1). Despite the non-annual nature of whorls in the study population, whorl counts may have some potential as a non-invasive method of age estimation in juvenile A. araucana. In both shade- and sun-grown subpopulations, whorl number was a better predictor of stem age than were stem diameter or height
author	LUSK,CHRISTOPHER H. LE-QUESNE,CARLOS
author_facet	LUSK,CHRISTOPHER H. LE-QUESNE,CARLOS
author_sort	LUSK,CHRISTOPHER H.
title	Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
title_short	Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
title_full	Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
title_fullStr	Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
title_full_unstemmed	Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?
title_sort	branch whorls of juvenile araucaria araucana (molina) koch: are they formed annually?
publisher	Sociedad de Biología de Chile
publishDate	2000
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013
work_keys_str_mv	AT luskchristopherh branchwhorlsofjuvenilearaucariaaraucanamolinakocharetheyformedannually AT lequesnecarlos branchwhorlsofjuvenilearaucariaaraucanamolinakocharetheyformedannually
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Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually?

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