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Registros recuperados: 5
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Patterns of tree seedling mortality in a temperate-mediterranean transition zone forest in Chile Gayana Botánica
PARADA,TERESA; LUSK,CHRISTOPHER H..
Seedling mortality in forests is the net result of an array of processes that vary spatially and temporally. We quantified emergence and mortality of seedlings at monthly intervals for two years, in a forest situated in the transition zone between the Mediterranean and temperate regions of Chile. We aimed to determine if survival of species responded differentially to seasonal water availability, to the spatial variation in light availability and to seedling density. The commonest species in the seedling bank were the Mediterranean-climate species Cryptocarya alba (61%) and the temperate-climate species Aextoxicon punctatum (29%). 279 of the 504 new seedlings that emerged during the two-year study died during the same period, corresponding to 55,4%...
Tipo: Journal article Palavras-chave: Aextoxicon punctatum; Cryptocarya alba; Density-dependent mortality; Drought tolerance; Shade tolerance.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200015
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Leaf life spans of some conifers of the temperate forests of South America RChHN
LUSK,CHRISTOPHER H..
Interspecific variation in leaf life span has wide-ranging implications for plant species sorting on resource availability gradients, and for ecosystem processes such as nutrient cycling. Very little is known about leaf life spans of evergreen trees in the temperate forests of South America. Leaf life spans were estimated by static demographic methods, and associated leaf traits measured, for four conifers of this region. It was expected that leaf life span variation would correlate negatively with soil fertility of habitats normally occupied by each species. This prediction was upheld by the data. The mean leaf life span determined for Araucaria araucana (24 years) is among the highest figures reported for any plant species. This extreme leaf longevity...
Tipo: Journal article Palavras-chave: Araucaria araucana; Leaf longevity; Leaf nitrogen; Podocarpus; Resource gradients; Specific leaf area.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300017
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Descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas RChHN
LUSK,CHRISTOPHER H.; DONOSO,CESAR; JIMÉNEZ,MYLTHON; MOYA,CAROLINA; OYARCE,GISELA; REINOSO,RODRIGO; SALDAÑA,ALFREDO; VILLEGAS,PAOLA; MATUS,FRANCISCO.
En el centro-sur de Chile, las últimas décadas han sido testigo de una conversión masiva de bosques, matorrales y tierras agrícolas a plantaciones de árboles exóticos. Aunque se ha estudiado la influencia de dichos cambios sobre el balance hídrico, los posibles efectos sobre otros procesos ecosistémicos han recibido poca atención. En esta breve comunicación se presentan datos de un estudio de la descomposición de hojarasca de Pinus radiata y tres especies arbóreas nativas, llevado a cabo con el fin de explorar los posibles efectos del reemplazo de bosque nativo por plantaciones exóticas sobre el ciclaje de nutrientes. Se incubaron muestras de las cuatro especies en dos ambientes distintos en sitios colindantes: bajo un bosque nativo secundario, y bajo un...
Tipo: Journal article Palavras-chave: Área foliar específica; Ciclaje de nutrientes; Nitrógeno foliar; Nothofagus; Plantaciones exóticas.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300016
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Influencia de las especies del dosel en la disponibilidad de recursos y regeneración avanzada en un bosque templado lluvioso del sur de Chile RChHN
SALDAÑA,ALFREDO; LUSK,CHRISTOPHER H..
La heterogeneidad de hábitat en el sotobosque es un factor que promueve el mantenimiento de la diversidad de especies de la comunidad forestal. En este estudio se evaluó la influencia de cuatro especies dominantes de un bosque templado del sur de Chile, Laureliopsis philippiana, Aextoxicon punctatum, Eucryphia cordifolia y Nothofagus dombeyi, sobre la disponibilidad de recursos y su relación con la composición de la regeneración avanzada. Se estimó el porcentaje de luz difusa, la disponibilidad de nitrógeno, fósforo y calcio, el contenido de nitrógeno, fósforo y calcio de la hojarasca, y se determinó la composición de la regeneración avanzada bajo los doseles de cada una de las cuatro especies. Además, se realizó una ordenación para evaluar la variación de...
Tipo: Journal article Palavras-chave: Bosque siempreverde; Composición de la regeneración; Mineralización; Gradiente de luz.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000400008
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Branch whorls of juvenile Araucaria araucana (Molina) Koch: are they formed annually? RChHN
LUSK,CHRISTOPHER H.; LE-QUESNE,CARLOS.
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...
Tipo: Journal article Palavras-chave: Araucariaceae; Conifers; Dendroecology; Tree growth; Tree rings.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300013
Registros recuperados: 5
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