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Titolo:
Effects of light and intraspecific competition on growth and crown morphology of two size classes of understory balsam fir saplings
Autore:
Duchesneau, R; Lesage, I; Messier, C; Morin, H;
Indirizzi:
Univ Quebec, GREF Interuniv, Montreal, PQ H3C 3P8, Canada Univ Quebec Montreal PQ Canada H3C 3P8 univ, Montreal, PQ H3C 3P8, Canada Univ Quebec, Dept Sci Fondamentales, Consortium Rech Foret Boreale Commerciale, Chicoutimi, PQ G7H 2B1, Canada Univ Quebec Chicoutimi PQ Canada G7H 2B1 , Chicoutimi, PQ G7H 2B1, Canada
Titolo Testata:
FOREST ECOLOGY AND MANAGEMENT
fascicolo: 2-3, volume: 140, anno: 2001,
pagine: 215 - 225
SICI:
0378-1127(20010115)140:2-3<215:EOLAIC>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCOTS PINE STANDS; SHADE-TOLERANCE; EFFICIENT METHOD; LEAF MORPHOLOGY; ABIES-BALSAMEA; SPRUCE BUDWORM; ARCHITECTURE; FOREST; AVAILABILITY; CANOPY;
Keywords:
Abies balsamea; crown morphology; understory saplings; competition; light; advanced regeneration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Messier, C Univ Quebec, GREF Interuniv, CP 8888,Succursale Ctr Ville, Montreal, PQ H3C 3P8, Canada Univ Quebec CP 8888,Succursale Ctr Ville Montreal PQ Canada H3C 3P8
Citazione:
R. Duchesneau et al., "Effects of light and intraspecific competition on growth and crown morphology of two size classes of understory balsam fir saplings", FOREST ECOL, 140(2-3), 2001, pp. 215-225

Abstract

This paper characterizes the growth and crown morphology of young balsam fir saplings naturally regenerated under a gradient of understory light environments and intraspecific competition densities for two size classes (50-100 cm and 100-200 cm). Most growth and crown morphological parameters investigated were strongly related to the natural light gradient investigated (3-83% full sunlight), but the relationship tended to plateau at around 25% full sunlight. The relationships were generally better for the larger size class. Intraspecific competition did not significantly affect growth and crown morphology of saplings receiving less than 25% full sunlight, but it affected relative height growth, relative radial growth and the apical dominance ratio for those receiving more than 25% full sunlight (R-2=0.506; p<0.001; R-2=0.403; p<0.002; R-2=0.348; p<0.001, respectively). These results suggest that live crown ratio, apical dominance ratio and the number of internodal branches can provide, alone or in combination, useful indicators of vigour for understory fir. Such a study provides the basic data inputs required for the development of empirically-derived mechanistic models that can predict understory tree growth and survival. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 15:55:17