WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST

Bamboos of the genus Chusquea are aggressive colonisers of tree-fall gaps in the temperate rain forests of southern Chile. Chusquea thickets inhibit regeneration of tree species, suggesting that light levels beneath bamboo-filled gaps may be lower than beneath tall forest. Two LAI-2000 canopy analys...

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Autor principal:	Lusk,Christopher H.
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2001
Materias:	Chusquea diffuse light forest dynamics LAI-2000 positive feedback vegetation switch
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003
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spelling	oai:scielo:S0717-664320010001000032002-05-08WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FORESTLusk,Christopher H. Chusquea diffuse light forest dynamics LAI-2000 positive feedback vegetation switch Bamboos of the genus Chusquea are aggressive colonisers of tree-fall gaps in the temperate rain forests of southern Chile. Chusquea thickets inhibit regeneration of tree species, suggesting that light levels beneath bamboo-filled gaps may be lower than beneath tall forest. Two LAI-2000 canopy analysers were used to compare diffuse light availability beneath five Chusquea quila thickets and five neighbouring tall forest stands, in a low altitude (<FONT FACE=Symbol>È</FONT> 400 m a.s.l.) old-growth temperate rain forest in Parque Nacional Puyehue (40º39'S). Leaf area indices (LAI) of these two vegetation phases are also compared. Average diffuse light levels beneath bamboo thickets (1.5 %) were only slightly lower than those beneath tall forest (1.7 %). Similarly, mean leaf area index of Chusquea thickets (6.1) was slightly higher than that calculated for tall forest stands (5.3). However, measurement of leaf area index with the LAI-2000 is likely to overestimate the actual photosynthetic surface area of bamboo thickets, due to retention of dead leaves by Chusquea. On the other hand, LAI of tall forest stands is underestimated, due to the omission of forest floor vegetation < 50 cm tall. The abundance of Chusquea thickets in old-growth forest, and their ability to retain sites by suppression of tree regeneration, suggests that a two-phase positive-feedback vegetation switch model is appropriate for the dynamics of these forestsinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.58 n.1 20012001-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003en10.4067/S0717-66432001000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Chusquea diffuse light forest dynamics LAI-2000 positive feedback vegetation switch
spellingShingle	Chusquea diffuse light forest dynamics LAI-2000 positive feedback vegetation switch Lusk,Christopher H. WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
description	Bamboos of the genus Chusquea are aggressive colonisers of tree-fall gaps in the temperate rain forests of southern Chile. Chusquea thickets inhibit regeneration of tree species, suggesting that light levels beneath bamboo-filled gaps may be lower than beneath tall forest. Two LAI-2000 canopy analysers were used to compare diffuse light availability beneath five Chusquea quila thickets and five neighbouring tall forest stands, in a low altitude (<FONT FACE=Symbol>È</FONT> 400 m a.s.l.) old-growth temperate rain forest in Parque Nacional Puyehue (40º39'S). Leaf area indices (LAI) of these two vegetation phases are also compared. Average diffuse light levels beneath bamboo thickets (1.5 %) were only slightly lower than those beneath tall forest (1.7 %). Similarly, mean leaf area index of Chusquea thickets (6.1) was slightly higher than that calculated for tall forest stands (5.3). However, measurement of leaf area index with the LAI-2000 is likely to overestimate the actual photosynthetic surface area of bamboo thickets, due to retention of dead leaves by Chusquea. On the other hand, LAI of tall forest stands is underestimated, due to the omission of forest floor vegetation < 50 cm tall. The abundance of Chusquea thickets in old-growth forest, and their ability to retain sites by suppression of tree regeneration, suggests that a two-phase positive-feedback vegetation switch model is appropriate for the dynamics of these forests
author	Lusk,Christopher H.
author_facet	Lusk,Christopher H.
author_sort	Lusk,Christopher H.
title	WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
title_short	WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
title_full	WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
title_fullStr	WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
title_full_unstemmed	WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST
title_sort	when is a gap not a gap?: light levels and leaf area index in bamboo-filled gaps in a chilean rain forest
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003
work_keys_str_mv	AT luskchristopherh whenisagapnotagaplightlevelsandleafareaindexinbamboofilledgapsinachileanrainforest
_version_	1718442202513801216

WHEN IS A GAP NOT A GAP?: LIGHT LEVELS AND LEAF AREA INDEX IN BAMBOO-FILLED GAPS IN A CHILEAN RAIN FOREST

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