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| Cárdenas Garrido,Cecilia; Lusk,Christopher H.. |
| It has been argued that if the cost of investment in cold resistance mechanisms detracts significantly from growth rates, then height growth tradeoffs should control species sorting on latitudinal temperature gradients. Applying the same logic to altitudinal temperature gradients, it can be predicted that species' upper altitudinal limits will be fixed by their degree of cold resistance, whereas the lower altitudinal limits of species growing higher up will be set by competition from faster-growing thermophilous species. We tested this prediction for three Nothofagus species on an altitudinal gradient (1,100 - 1,700 m) near Termas de Chillán, on the lower western slopes of the Andean Cordillera. We used retrospective methods to measure height increment... |
| Tipo: Journal article |
Palavras-chave: Altitude; Cold resistence; Competition; Temperate forest; Tradeoff. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100004 |
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| Lusk,Christopher H.. |
| 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... |
| Tipo: Journal article |
Palavras-chave: Chusquea; Diffuse light; Forest dynamics; LAI-2000; Positive feedback vegetation switch. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432001000100003 |
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| Villegas D.,Paola; Le Quesne,Carlos; Lusk,Christopher H.. |
| Gomortega keule (Mol.) Baillon es un árbol endémico de Chile, que se encuentra actualmente en peligro de extinción. Aunque los patrones de regeneración de la especie se desconocen, algunos autores aluden a una generalizada escasez de plántulas. Este artículo presenta una investigación de la estructura poblacional y los patrones de regeneración de G. keule en un bosque antiguo en Caramávida, Cordillera de Nahuelbuta. Los objetivos fueron (i) determinar el patrón de regeneración que esta especie ha presentado en el pasado, (ii) verificar si existe actualmente regeneración sexual de G. keule y (iii) caracterizar los ambientes lumínicos en que ésta se produce. En una parcela de 0,24 ha se midió el diámetro a la altura de pecho (DAP) y la posición espacial de... |
| Tipo: Journal article |
Palavras-chave: Caramávida; Dinámica forestal; LAI-2000; Rareza; Regeneración. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000200005 |
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