Competition-induced mortality for Mediterranean Pinus pinaster Ait. and P. sylvestris L.

Bravo‐Oviedo, Andrés; Sterba, Hubert; Rı́o, Miren del; Bravo, F.

doi:10.1016/j.foreco.2005.10.016

Cited by 84 publications

(73 citation statements)

References 40 publications

(52 reference statements)

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“…2). Random numbers can also be considered (Bravo-Oviedo et al, 2006), by running the random calculation 10 times, the threshold for each observation being the average classification rates. Table VI presents the overall predictions and the best prediction of mortality for both the fitting data set and the test data set obtained using the average observed mortality rate, intersection point of sensitivity and specificity and random numbers.…”

Section: Discussionmentioning

confidence: 99%

“…Drobyshev et al (2009) found a significant and consistent association between tree condition and the probability of mortality, and significantly higher mortality rates in smaller trees of oak. The same variables as those finally included in the mortality model for Quercus pyrenaica have also been identified for others species: inverse of diameter at breast height (Bravo-Oviedo et al, 2006;Jutras et al, 2003;Karlsson and Norell, 2005); and individual height-dominant height ratio (Avila and Burkhart, 1992).…”

Section: Discussionmentioning

confidence: 99%

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Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Adame¹,

Rı́o²,

Cañellas³

2010

Ann. For. Sci.

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Keywords:individual-tree mortality model / logistic regression / mixed model / rebollo oak / Mediteranean oak Abstract • Tree mortality is an important process in forest ecosystem dynamics and is one of the least understood phenomena, because of the complex interactions between different environmental stresses, minimal understanding of whole-plant mortality processes, and a chronic shortage of data.• A multilevel logistic regression model was developed for predicting the probability of mortality in individual trees with the objective of improving long-term planning in Spanish pyrenean oak forests. The data came from one 10-year re-measurement of the permanent plot network belonging to the Spanish National Forest Inventory distributed throughout north-west Spain.• The probability of mortality decreased with increasing individual diameter at breast height and increasing ratio of the height of subject tree to the dominant height of the sample plot. The resulting mortality model was evaluated using an independent data set from a region close to the study area.• The regeneration of pyrenean oak generally takes place through stump and/or root sprouting; so stand dynamics differ from those of others species. The model developed is expected to improve the accuracy of stand forecasts in northwest Spain.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Adame¹,

Rı́o²,

Cañellas³

2010

Ann. For. Sci.

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“…P. pinaster is considered more drought tolerant than P. sylvestris. The former grows in montane areas with irregular precipitation and high temperatures in summer, while the latter is frequently found at a higher altitude mainly in northern aspects, with higher precipitation and mild temperatures (Bravo-Oviedo et al, 2006). The spatial distribution of these species in the study region is represented in Figure 1. …”

Section: Study Region and Speciesmentioning

confidence: 99%

Rank reversals in tree growth along tree size, competition and climatic gradients for four forest canopy dominant species in Central Spain

et al. 2008

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-• Interspecific differences in tree growth patterns with respect to biotic and abiotic factors are key for understanding forest structure and dynamics, and predicting potential changes under climate change.• Repeated observations from the Spanish Forest Inventory (SFI) were used to parameterize maximum likelihood estimators of tree growth as a function of tree size, competition indices and climate for Pinus pinaster, P. sylvestris, Quercus ilex and Q. pyrenaica.• Significant responses to both biotic and abiotic factors were found, with interspecific differences in species performance along competition, temperature and precipitation gradients. Q. ilex was the species most tolerant to competition while P. pinaster was the species most sensitive to climatic variation. Species relative positions shifted along gradients of these factors with rank reversals in species performance along size, competition and climatic gradients.• The results based on average growth matched previous forestry classifications and experimental studies on relative growth rate (RGR).• When examining growth along studied abiotic and biotic gradients, a mismatch was found between species performance ranks as predicted by our models and information derived from previous knowledge. Those discrepancies highlight the relevance of ontogeny and environmental heterogeneity in defining species performance along competition gradients. niche differentiation / Pinus pinaster / Pinus sylvestris / Quercus ilex / Quercus pyrenaica Résumé -Interversion de rangs dans la croissance des arbres en relation avec la taille de l'arbre, la compétition et les gradients climatiques pour quatre espèces forestières dominantes dans la canopée.• Les différences interspécifiques dans les modèles de croissance des arbres, pour ce qui concerne les facteurs biotiques et abiotiques, sont des clés pour la compréhension des structures et des dynamiques forestières, et pour prédire les changement potentiels avec le changement climatique.• Des observations répétées de l'Inventaire Forestier Espagnol (SFI) ont été utilisées pour paramétrer les estimateurs de probabilité maximum de croissance des arbres comme une fonction de la taille de l'arbre, des indices de compétition et du climat pour Pinus pinaster, Pinus sylvestris, Quercus ilex et Quercus pyrenaica.• Des réponses significatives aux facteurs biotiques et abiotiques ont été trouvées, avec des différences interspécifiques pour les performances des espèces en relation avec la compétition, les gradients de température et de précipitations. Quercus ilex a été l'espèce la plus tolérante à la compétition tandis que Pinus pinaster a été l'espèce la plus sensible aux variations climatiques. Les positions relatives des espèces ont changé en relation avec les gradients de ces facteurs avec des interversions de rang pour les performances des espèces en relation avec la taille, la compétition et les gradients climatiques.• Les résultats basés sur la moyenne de croissance sont en adéquation avec la classification forestière antér...

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“…The only way of enhancing stand development after canopy closure is by manipulation of stand density through thinning (Malcolm, 1997). Thinning is also necessary to avoid stand stagnation, reduce mortality rates (Bravo-Oviedo et al, 2006), promote long-term wind and snow stability (Montero et al, 2001) and enhance the amenity of the stand. It has even been shown that thinning can produce improvements in ring width without any negative impacts on wood properties Site index (SI) was evaluated as the dominant height at a reference age of 30 years.…”

Section: Introductionmentioning

confidence: 99%

Physical properties of wood in thinned Scots pines (Pinus sylvestris L.) from plantations in northern Spain

2008

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-• The physical properties of wood and the associated variations within and between trees were evaluated by analysing 770 small specimens of clear wood from 11 Pinus sylvestris L. trees thinned from 3 plantations.• Within-tree variations in basic density or volumetric shrinkage increased with cambial age and decreased with increasing ring width. The effect of the height in the stem on wood properties was considered indirect and height was not included as an explanatory variable in the mixed models proposed to estimate basic density and volumetric shrinkage.• The models had random components for the intercept parameter and explained 52.5% of the total variance in basic density and 56% of the total variance in volumetric shrinkage. Linear shrinkage in the direction of the grain was extremely variable.• Between-tree variation and between-plot variation in the physical properties of wood were high, considering that all trees sampled were growing in similar sites and stands. It would then be desirable to predict physical properties of wood on living trees in order to use the quality of wood as a criterion for timber tree selection in thinnings. Scots pine / Pinus sylvestris / wood properties / thinning Résumé -Propriétés physiques du bois de pin sylvestre (Pinus sylvestris L.) issu d'éclaircie dans des plantations du nord de l'Espagne.• Les propriétés physiques du bois et leurs variations intra et inter arbres ont été évaluées à partir de l'analyse de 770 éprouvettes de bois sans noeuds de 11 arbres d'éclaircie répartis sur 3 sites.• La densité et le retrait volumétrique augmentaient dans chaque arbre avec l'âge du cambium et diminuaient avec la largeur de cerne. On a considéré que la hauteur dans la tige n'avait qu'un effet indirect sur les propriétés du bois, aussi la hauteur a-t-elle été exclue des variables explicatives dans les modèles mixtes proposés pour estimer la densité et le retrait volumétrique.• Ces modèles présentent une composante aléatoire pour le terme constant et peuvent expliquer 52,5 % de la variabilité totale de la densité basique et 56 % de la variabilité totale du retrait volumétrique.• Le retrait longitudinal est extrêmement variable. La variation entre arbres et entre sites est très importante, compte tenu de la similarité des peuplements et sites étudiés.pin sylvestre / Pinus sylvestris / propriétés du bois / éclaircie

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Competition-induced mortality for Mediterranean Pinus pinaster Ait. and P. sylvestris L.

Cited by 84 publications

References 40 publications

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Rank reversals in tree growth along tree size, competition and climatic gradients for four forest canopy dominant species in Central Spain

Physical properties of wood in thinned Scots pines (Pinus sylvestris L.) from plantations in northern Spain

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