Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae

Although comparative studies have revealed much about the environmental correlates of leaf lifespan and its integration with other leaf traits, a comprehensive theory of leaf lifespan is still lacking. The influence of growth rate on self-shading may be a key proximate determinant of both inter- and...

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Autores principales:	LUSK,CHRISTOPHER H, CORCUERA,LUIS J
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2011
Materias:	height growth LAI-2000 path analysis self-shading shade tolerance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200011
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spelling	oai:scielo:S0716-078X20110002000112011-09-13Effects of light availability and growth rate on leaf lifespan of four temperate rainforest ProteaceaeLUSK,CHRISTOPHER HCORCUERA,LUIS J height growth LAI-2000 path analysis self-shading shade tolerance Although comparative studies have revealed much about the environmental correlates of leaf lifespan and its integration with other leaf traits, a comprehensive theory of leaf lifespan is still lacking. The influence of growth rate on self-shading may be a key proximate determinant of both inter- and intra-specific variation in leaf lifespans. If this were the case, we would expect leaf lifespans of fast-growing light-demanding species to respond more strongly to light environment than those of shade-tolerant species. We monitored growth and leaf survival of juvenile trees of four temperate rainforest Proteaceae in southern Chile, in order to explore the influences of light environment and self-shading on leaf lifespan. Leaf lifespans tended to decrease with increasing diffuse light availability, and slopes of these relationships were steeper in two light-demanding species (Embothrium coccineum, Lomatia hirsuta) than in two more shade-tolerant species (Lomatia ferruginea, Gevuina avellana). This pattern mirrored interspecific variation in relationships of height growth with light availability, height growth rates of the two light-demanding species responding more strongly to light availability than did growth of L. ferruginea and G. avellana. Path analysis suggested that light availability influenced leaf lifespans primarily through the influence of growth on self-shading: when rate of leaf production was held constant by multiple regression, light availability per se had no significant influence on leaf lifespans of any of the four species. However, 29 to 79 % of intraspecific variation in leaf lifespan remained unexplained by light environment and leaf production rate. If self-shading is fact the main proximate control on leaf lifespan, information on the elevational distribution of photosynthetic photon flux may enhance the explanatory power of studies of this nature.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.84 n.2 20112011-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200011en10.4067/S0716-078X2011000200011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	height growth LAI-2000 path analysis self-shading shade tolerance
spellingShingle	height growth LAI-2000 path analysis self-shading shade tolerance LUSK,CHRISTOPHER H CORCUERA,LUIS J Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
description	Although comparative studies have revealed much about the environmental correlates of leaf lifespan and its integration with other leaf traits, a comprehensive theory of leaf lifespan is still lacking. The influence of growth rate on self-shading may be a key proximate determinant of both inter- and intra-specific variation in leaf lifespans. If this were the case, we would expect leaf lifespans of fast-growing light-demanding species to respond more strongly to light environment than those of shade-tolerant species. We monitored growth and leaf survival of juvenile trees of four temperate rainforest Proteaceae in southern Chile, in order to explore the influences of light environment and self-shading on leaf lifespan. Leaf lifespans tended to decrease with increasing diffuse light availability, and slopes of these relationships were steeper in two light-demanding species (Embothrium coccineum, Lomatia hirsuta) than in two more shade-tolerant species (Lomatia ferruginea, Gevuina avellana). This pattern mirrored interspecific variation in relationships of height growth with light availability, height growth rates of the two light-demanding species responding more strongly to light availability than did growth of L. ferruginea and G. avellana. Path analysis suggested that light availability influenced leaf lifespans primarily through the influence of growth on self-shading: when rate of leaf production was held constant by multiple regression, light availability per se had no significant influence on leaf lifespans of any of the four species. However, 29 to 79 % of intraspecific variation in leaf lifespan remained unexplained by light environment and leaf production rate. If self-shading is fact the main proximate control on leaf lifespan, information on the elevational distribution of photosynthetic photon flux may enhance the explanatory power of studies of this nature.
author	LUSK,CHRISTOPHER H CORCUERA,LUIS J
author_facet	LUSK,CHRISTOPHER H CORCUERA,LUIS J
author_sort	LUSK,CHRISTOPHER H
title	Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
title_short	Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
title_full	Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
title_fullStr	Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
title_full_unstemmed	Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae
title_sort	effects of light availability and growth rate on leaf lifespan of four temperate rainforest proteaceae
publisher	Sociedad de Biología de Chile
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200011
work_keys_str_mv	AT luskchristopherh effectsoflightavailabilityandgrowthrateonleaflifespanoffourtemperaterainforestproteaceae AT corcueraluisj effectsoflightavailabilityandgrowthrateonleaflifespanoffourtemperaterainforestproteaceae
_version_	1718439653296570368

Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae

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