Estructura y funcionalismo de un encinar montano en el Montseny. II: biomasa arbórea

Ferrés, Lluís; Llanza, Ferran Rodà de; González, Antonio María Claret Verdú; Serra, Jaume Terradas

doi:10.14198/mdtrra1980.4.03

Cited by 6 publications

(5 citation statements)

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“…General features of 14 Holm oak forests and woodlands of the Western Mediterranean basin were compared before selecting a zone for intensive measurements of canopy structure and understory light. This preliminary analysis revealed that canopy height decreased and basal area increased with stem density, the latter being low or medium under traditional management and high when woodlands are abandoned (results from 400-2700 sampling plots in the Spanish provinces of Madrid, Cádiz, Málaga, Huelva, Almería, Córdoba, Jaén, Sevilla and Granada -National Forestry Inventory -, and mean values reported for Gardiole de Rians, France [30], La Bruguiere, France [15], Riofrío, Segovia, Spain [45], Maremma National Park, Italy [34], La Castanya, Spain [19], and Prades, L'Avic, La Teula and B. Tornés, Spain [21,42]). The area between 40…”

Section: Study Area and Experimental Designmentioning

confidence: 99%

Canopy structure and spatial heterogeneity of understory light in an abandoned Holm oak woodland

Valladares

Guzmán

2006

Ann. For. Sci.

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-Understory light is crucial to understand forest ecology but there is scant information for Mediterranean forests. Understory light of an abandoned Holm oak (Quercus ilex L.) woodland was studied in central Spain by means of hemispherical photographies in a 30 × 30 grid of 1-m 2 points. Canopy height, stem density and basal area had a significant influence on understory light. Height exhibited the most significant correlation, with indirect light. However, its potential as a predictor of understory light was low due to the large fraction of unexplained variance. Sunflecks contributed to half of the understory light; they were intense and long (25 min), and 10 min shorter at the herb than at the shrub layer. Mean light availability in the understory was half of that in the open and it exhibited a significant spatial heterogeneity. Spatial grain was significantly coarser for indirect than for direct light; it was also coarser at the herb than at the shrub layer, indicating that while a single individual shrub exploits light heterogeneity via phenotypic plasticity at the shrub layer, different individuals or micropopulations exploit it at the herb layer. Abandonment of traditional management of Holm oak woodlands leads to a decrease in both the availability and the spatial heterogeneity of understory light.hemispherical photography / Holm oak / understory light / Mediterranean forests / spatial heterogeneity Résumé -Structure du couvert et hétérogénéité spatiale du rayonnement lumineux transmis dans une friche à chêne vert. Le rayonnement transmis sous couvert est une composante essentielle de l'écologie forestière. Malheureusement, peu d'information est disponible sur ce point dans le cas des forêts méditerranéennes. Le rayonnement lumineux transmis sous la couvert d'un peuplement de chêne vert (Quercus ilex L.) issu d'une friche a été étudié en Espagne centrale en utilisant des photographies hémisphériques prises selon une grille 30 × 30 de placettes de 1 m 2 . La hauteur des arbres, la densité du peuplement et la surface terrière modulaient fortement le rayonnement transmis. La hauteur des arbres était significativement corrélée à la transmission du rayonnement diffus. Cependant, la valeur prédictive de ce paramètre était faible, du fait d'une très forte variance résiduelle. Les taches de soleil contribuaient à la moitié du rayonnement transmis ; elles étaient à la fois intenses et de longue durée (25 min en moyenne). Au niveau de la strate herbacée, ces taches présentaient une durée plus faible (d'environ 10 min). Le rayonnement transmis par le couvert de chêne représentait en moyenne 50 % du rayonnement incident, et présentait une forte hétérogénéité spatiale. Le grain spatial de cette hétérogénéité était plus grossier pour le rayonnement diffus que pour le rayonnement direct, et était également plus grossier au niveau de la strate herbacée que de la strate arbustive. Ceci montre qu'un arbuste exploite cette hétérogénéité via la plasticité phénotypique, alors que dans la strate herbacée les individus...

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Section: Study Area and Experimental Designmentioning

confidence: 99%

Canopy structure and spatial heterogeneity of understory light in an abandoned Holm oak woodland

Valladares

Guzmán

2006

Ann. For. Sci.

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“…The sample of branches less than 1 cm in diameter was separated into foliage and twigs prior to drying, in order to know the foliage weight. Fifty-six holm oaks were felled (28 from northfacing slopes and 28 from south-facing slopes) which, together with 15 trees from the study carried out by Ferris et al (1980), make up a total of 71 trees treated in this work.…”

Section: Study Areamentioning

confidence: 99%

“…Allometric equations were already available for holm oak at Montseny (Ferris et al, 1980), obtained from 15 trees felled next to an experimental plot set up for monitoring nutrient cycling studies (Terradas et al, 1980;Ferris et al, 1984). It is accepted that the allometric equations for a species in a given area can be obtained from a detailed study of 15 trees covering the whole range of diameters (Duvigneaud, 1971).…”

Section: Introductionmentioning

confidence: 99%

Biomass Equations for Quercus ilex L. in the Montseny Massif, Northeastern Spain

1988

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Biomass estimation equations for individual holm oak (Quercus ilex spp. ilex) were developed using data from 71 sample trees. Diameter alone was a strong predictor of biomass, but better biomass estimates were obtained when height and crown projection radius were added to the model. In addition to total above-ground dry weight, different biomass components were calculated: stem (greater than 5 cm in diameter), branches 1 to 5 cm in diameter, branches less than 1 cm in diameter, and foliage. Grouping the trees according to height (taller or shorter than 7 m) and aspect (north-and south-facing slopes) resulted in significantly different allometric equations for most of the components considered. Improved estimates were achieved in many cases when D50 (diameter at 0.5 m) was used instead of DBH. Comparison of the results with other published equations developed for Q.ilex and other oaks showed differences, probably due to morphological diversity of trees and different DBH class distribution of samples used.

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“…Mientras que los departamentos de las Universidades de Barcelona iniciaban en la zona de la Castanya, en el Montseny, los trabajos cuyos resultados iniciales figuran en , TERRADAS et al (1980), FERRES et al (1980), RODA et al (1980, el departamento de Biología de la Universidad de Alicante comenzaba un proceso de búsqueda de la zona más idónea para abordar el proyecto con la técnica de la cuenca impermeable de pequeña extensión.…”

Section: Introductionunclassified

Balance de nutrientes en pequeñas cuencas del encinar. I: selección de la zona de estudio e instalación de instrumentos para la recogida de datos

Esteve¹,

Abad²,

Solbes³

et al. 1982

MDTRRA

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Estructura y funcionalismo de un encinar montano en el Montseny. II: biomasa arbórea

Cited by 6 publications

References 1 publication

Canopy structure and spatial heterogeneity of understory light in an abandoned Holm oak woodland

Canopy structure and spatial heterogeneity of understory light in an abandoned Holm oak woodland

Biomass Equations for Quercus ilex L. in the Montseny Massif, Northeastern Spain

Balance de nutrientes en pequeñas cuencas del encinar. I: selección de la zona de estudio e instalación de instrumentos para la recogida de datos

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