Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina

SUMMARY: Araucaria angustifolia is an ecologically and commercially important species of the Atlantic Forest. However, its ability to regenerate continuously under the shade of the canopy in the rainforest is uncertain. The aims were: to evaluate the morpho-physiological responses of araucaria to di...

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Autores principales:	Olguin,Flavia Y, Moretti,Ana P, Pinazo,Martín A, Graciano,Corina
Lenguaje:	English
Publicado:	Universidad Austral de Chile, Facultad de Ciencias Forestales 2019
Materias:	abiotic stress ecophysiology Paraná pine rainforest gaps sun and shade tolerance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002019000300323
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spelling	oai:scielo:S0717-920020190003003232020-01-13Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, ArgentinaOlguin,Flavia YMoretti,Ana PPinazo,Martín AGraciano,Corina abiotic stress ecophysiology Paraná pine rainforest gaps sun and shade tolerance SUMMARY: Araucaria angustifolia is an ecologically and commercially important species of the Atlantic Forest. However, its ability to regenerate continuously under the shade of the canopy in the rainforest is uncertain. The aims were: to evaluate the morpho-physiological responses of araucaria to different intensities of canopy coverage to know its shade acclimation capacity; and to evaluate survival and growth under different shade intensities in gaps. First, seedlings were grown in pots at full sun or under canopy shade and morpho-physiological traits were measured after 6 and 12 months. Survival was 100 % under full sun and 40 % under shade. One year after planting, the ability to use high-intensity light was similar in plants under both conditions, although shade plants did not grow and showed little capacity to acclimate to shade. Plants under full sun duplicated their size in six months and had higher capacity to deliver water to the leaves. However, shade plants had higher specific hydraulic conductance. After that, in a field experiment, seedlings were planted in six forest-gaps to record survival and growth for 30 months. Survival was high in all positions within the gaps. In the center of the gaps, where incident radiation was higher, growth was higher. We conclude that araucaria has low ability to acclimate to low radiation, nevertheless, it can survive at least 30 months under the canopy. Consequently, araucaria should not be planted below dense canopy shade. The microenvironment in the center of 195-293 m2 gaps is proper for araucaria growth.info:eu-repo/semantics/openAccessUniversidad Austral de Chile, Facultad de Ciencias ForestalesBosque (Valdivia) v.40 n.3 20192019-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002019000300323en10.4067/S0717-92002019000300323
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	abiotic stress ecophysiology Paraná pine rainforest gaps sun and shade tolerance
spellingShingle	abiotic stress ecophysiology Paraná pine rainforest gaps sun and shade tolerance Olguin,Flavia Y Moretti,Ana P Pinazo,Martín A Graciano,Corina Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
description	SUMMARY: Araucaria angustifolia is an ecologically and commercially important species of the Atlantic Forest. However, its ability to regenerate continuously under the shade of the canopy in the rainforest is uncertain. The aims were: to evaluate the morpho-physiological responses of araucaria to different intensities of canopy coverage to know its shade acclimation capacity; and to evaluate survival and growth under different shade intensities in gaps. First, seedlings were grown in pots at full sun or under canopy shade and morpho-physiological traits were measured after 6 and 12 months. Survival was 100 % under full sun and 40 % under shade. One year after planting, the ability to use high-intensity light was similar in plants under both conditions, although shade plants did not grow and showed little capacity to acclimate to shade. Plants under full sun duplicated their size in six months and had higher capacity to deliver water to the leaves. However, shade plants had higher specific hydraulic conductance. After that, in a field experiment, seedlings were planted in six forest-gaps to record survival and growth for 30 months. Survival was high in all positions within the gaps. In the center of the gaps, where incident radiation was higher, growth was higher. We conclude that araucaria has low ability to acclimate to low radiation, nevertheless, it can survive at least 30 months under the canopy. Consequently, araucaria should not be planted below dense canopy shade. The microenvironment in the center of 195-293 m2 gaps is proper for araucaria growth.
author	Olguin,Flavia Y Moretti,Ana P Pinazo,Martín A Graciano,Corina
author_facet	Olguin,Flavia Y Moretti,Ana P Pinazo,Martín A Graciano,Corina
author_sort	Olguin,Flavia Y
title	Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
title_short	Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
title_full	Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
title_fullStr	Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
title_full_unstemmed	Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina
title_sort	morpho-physiological acclimation to canopy coverage of araucaria angustifolia during the establishment in the atlantic forest, argentina
publisher	Universidad Austral de Chile, Facultad de Ciencias Forestales
publishDate	2019
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-92002019000300323
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Morpho-physiological acclimation to canopy coverage of Araucaria angustifolia during the establishment in the Atlantic Forest, Argentina

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