Evaluation of the production of acorns of the oak (
            <i>Quercus ilex</i>
            Lam. ssp.
            <i>ballota</i>
            ) from south-west of Extremadura (Spain).

Poblaciones, M. J.; López‐Bellido, Rafael J.; Olea, L.; Benito, Cristóbal Gómez; Mosquera‐Losada, M. R.; Rigueiro-Rodríguez, A.; McAdam, J.

doi:10.1079/9781845930011.0174

Cited by 2 publications

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“…Alvarez et al [3] harvested an average production of 10.45 kg DM/tree from Salamanca dehesas with a tree density of 25 trees/ha on the assumption of a water content of 45% for the fruits. Poblaciones et al [22] estimated the average acorn production over a two-year period in five dehesas in Extremadura (W Spain) to be 600-830 kg DM/ha and found large differences between individual dehesas; these levels are higher than the average production values for our plots (227.5 kg DM/ha).…”

Section: Discussioncontrasting

confidence: 42%

Influence of pruning and the climatic conditions on acorn production in holm oak (Quercus ilex L.) dehesas in SW Spain

et al. 2008

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-Acorn production by Quercus ilex L. ssp. ballota (Desf.) Samp. in SW Spain was assessed, and variations between years and the influence of pruning on it were examined. To this end, an experimental study was conducted at two different sites (Calañas and San Bartolomé, in the province of Huelva) where trees were subjected to traditional (light, moderate or heavy) pruning and also to a new (crown-regeneration) pruning method. Acorn yield was quantified over a period of 5 years in the Calañas plot and 4 in the San Bartolomé plot, and found to average at 95.61 ± 0.76 g DM/m 2 , which is equivalent to 6.5 ± 0.05 kg DM/tree; however, yield figures varied markedly between years depending on the particular climatic conditions. The average acorn production was correlated with the water potential in mid summer (end of July); the annual, spring and autumn rainfall; and the actual evapotranspiration for the period from September (previous year) to August. No significant differences in acorn production between traditional pruning intensities were detected; in fact, there were only hints that heavy pruning might result in decreased acorn yields. The new pruning method used, crown-regeneration, seems promising with a view to increasing acorn yield; however, it should be tested on larger sample sizes before any final conclusions can be drawn in this respect. Based on the results, the present health status of holm oaks in southwestern Spain (a result of sustained decline) and the low value of firewood -which used to be a very important source of income from pruning a few decades ago -, the authors recommend reducing the frequency and intensity of pruning in the dehesas of the study area.holm oak / acorn production / pruning / masting Résumé -Influence de la taille et des conditions climatiques sur la production de glands par le chêne vert (Quercus ilex L.) en dehesas dans le sud ouest de l'Espagne. La production de glands par Quercus ilex L. ssp. ballota (Desf.) Samp. dans le sud ouest de l'Espagne a été mesurée, et l'influence de la taille sur les variations interannuelles a été examinée. Dans ce but, une étude expérimentales a été conduite dans deux sites (Calañas et San Bartolomé dans la province de Huelva) où des arbres ont été soumis à une taille traditionnelle (légère, modérée ou forte) et aussi à une nouvelle méthode de taille (régénération de couronne). La production de glands a été quantifiée sur une période de 5 ans sur le site de Calañas et de 4 ans sur celui de San Bartolomé et était en moyenne de 95,61 ± 0,76 g de matière sèche/m 2 , ce qui équivaut à 6,5 ± 0,05 kg de matière sèche/arbre. Cependant la production a varié de façon marquée entre années en relation avec les particularités climatiques. La moyenne de production de glands était corrélée avec le potentiel hydrique au milieu de l'été (fin juillet) ; avec les précipitations annuelles, du printemps et de l'automne, et avec l'évapotranspiration pour les périodes allant de septembre (année précédente) à août. Aucune différence significative de productio...

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Section: Discussioncontrasting

confidence: 42%

Influence of pruning and the climatic conditions on acorn production in holm oak (Quercus ilex L.) dehesas in SW Spain

et al. 2008

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“…All previous studies related with acorn production (Martin et al 1998;Á lvarez et al 2002;Carbonero et al 2002;Gea-Izquierdo et al 2006;Poblaciones et al 2006;Cañellas et al 2007;Alejano et al 2008) have not considered these two components separately. Nevertheless, to get a better understanding of the acorn production process it is very important to analyze both components separately, as silvicultural and ecological factors will affect them differently.…”

Section: Introductionmentioning

confidence: 99%

Do ecological and silvicultural factors influence acorn mass in Holm Oak (southwestern Spain)?

et al. 2011

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The effect of orientation, location, year, and pruning treatment on mean acorn mass in two open woodland experimental locations (Huelva, South-Western Spain) of Holm Oak (Quercus ilex L. subsp. ballota [Desf.] Samp.) was analyzed during [2001][2002][2003][2004][2005][2006]. Data were analyzed by using a mixed linear model, where the covariates were tree size parameters (circumference at 80 cm height, crown size), topographic position (wet index and flow length), intraspecific competition, total acorn crops per tree (weight and number), and climatic parameters. Average estimated acorn mass was 3.17 g acorn -1 in the Calañas location and 4.12 g acorn -1 in the San Bartolomé location, with significant differences between locations, among individual trees and across years. Acorns from the south sides of trees were significantly heavier than those at other positions. The effect of pruning treatment and the interactions location 9 treatment and treatment 9 year were not significant. Our study provides no evidence that pruning affects acorn mass. None of the analyzed covariates related to tree size, topographic position and intraspecific competition explained the difference among trees, suggesting that heritable factors play an important role. Specific climatic parameters during September, the most important month for acorn growth, may explain the effects of year and location 9 year on acorn mass. In addition, there appeared to be a ''trade-off'' between acorn mass and number of acorns.

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Evaluation of the production of acorns of the oak ( Quercus ilex Lam. ssp. ballota ) from south-west of Extremadura (Spain).

Cited by 2 publications

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Influence of pruning and the climatic conditions on acorn production in holm oak (Quercus ilex L.) dehesas in SW Spain

Influence of pruning and the climatic conditions on acorn production in holm oak (Quercus ilex L.) dehesas in SW Spain

Do ecological and silvicultural factors influence acorn mass in Holm Oak (southwestern Spain)?

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