6 research outputs found

    Autoecología, calidad de estación y xilología de "Quercus pyrenaica" Willd. en Galicia

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    Los rebollares, bosques de Quercus pyrenaica Willd., son un patrimonio natural de gran valor que desempeñan importantes funciones de conservación del suelo y del agua, de la biodiversidad y del paisaje natural, contribuyendo a una satisfacción económica de las poblaciones a partir de actividades como la caza, el turismo, el aprovechamiento de la madera,..., razones por las que se justifica la realización de un estudio sobre estos rebollares. Teniendo en cuenta que los estudios globales realizados sobre esta especie en Galicia son inexistentes hasta la fecha, nos planteamos hacer un trabajo en el que se describan estas masas, intentando dar a conocer su importancia a traves de su caracterización ecológica, delimitación de calidades de estación, estudio de la aptitud tecnológica de la madera y de las propiedades de ésta tanto físicas como mecánicas.Pyrenean oak (Quercus pyrenaica) stands are a very valuable natural heritage and have important functions in the conservation of soil, water, biodiversity and the natural landscape. They are also of economic value to local populations through activities such as hunting, tourism, timber exploitation,… reasons that justify their study. As no detailed studies have been made of this species in Galicia, we proposed describing the stands, attempting to establish their importance by characterising their ecological parameters, defining site index and studying the technological aptitude of the wood as well physical and mechanical properties

    Selección del tratamiento óptimo de aguas residuales para poblaciones del medio rural de Galicia

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    La depuración de aguas residuales en pequeños núcleos debe orientarse hacia alternativas diferentes a las que se suelen aplicar en poblaciones de mayor tamaño. En este sentido, la tecnología actual ofrece un amplio abanico de tratamientos, especialmente los denominados naturales o de bajo coste. Teniendo en cuenta los últimos desarrollos en este campo, en el presente trabajo se aplica una metodología de ayuda a la toma de decisiones para facilitar la elección del sistema de tratamiento más adecuado en núcleos rurales de Galicia. Los núcleos escogidos para el análisis abarcan gran parte de la diversidad del problema en el ámbito rural gallego

    La ordenación de las poblaciones de fauna cinegética para la práctica de la caza. El caso del TECOR Oleiros-Rioaveso (Villalba, Lugo)

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    En este artículo se argumenta sobre la necesidad de los proyectos de ordenación de los recursos cinegéticos y se pone como ejemplo el caso del TECOR Oleiros-Rioaveso (Villalba, Lugo), en el que se hace una descripción del medio natural, del estado de las poblaciones de fauna con interés cinegético y se propone un plan de caza para las principales especies que pueblan o van a poblar el coto: corzo, jabalí, zorro, perdiz roja, faisán y aves migratorias. También se mencionan las principales actuaciones de mejora (en infraestructuras, sobre el medio y sobre las especies cinegéticas). Finalmente se expone el balance económico resultado de la ordenación

    Autécologie du chêne tauzin (Quercus pyrenaica Willd.) en Galice (Espagne)

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    Autecology of rebollo oak (Quercus pyrenaica Willd.) in Galicia (Spain). The present work was focused as an ecological and tree mensuration Quercus pyrenaica stands study in Galicia. With that objective, a parametric characterization of the species actual located biotypes was made measuring 40 plots and 33 ecological parameters and another 14 tree mensuration and sylvicultural ones. This data has allowed to determine physiographic, climatic and edaphic habitat, central and marginal, of Quercus pyrenaica in Galicia. The results shows that this forests are more dry and less productive than Quercus robur and Q. petraea stands, what means abandonment of the traditional uses like firewood and a great fire risk with its sequential degradation. This situation involves a lot difficult to find good stands of Quercus pyrenaica. As summary it could be said that this forests present an altitudinal variation higher to 1000 m, what means an average temperature difference near to 6 °C, and the annual precipitation average is 1067.5 mm, being the summer average 115.2 mm, with somewhere summer drought.Le présent travail traite de l’étude des « rebollares » (bois de Quercus pyrenaica Willd.) en Galice, tant d’un point de vue écologique que dendrométrique. Pour cela nous avons réalisé une caractérisation paramétrique des biotopes que cette espèce occupe actuellement. Nous avons installé des parcelles en 40 points de l’échantillonnage et nous avons élaboré 33 paramètres écologiques caractéristiques du biotope, ainsi que 14 paramètres dendrométriques et sylvicoles. Ceci nous a permis de déterminer l’habitat topographique, climatique et édaphique, à la fois central et marginal, de Quercus pyrenaica en Galice, ainsi que d’évaluer la situation actuelle des peuplements qu’ils occupent d’un point de vue sylvicole. Il s’agit de forêts plutôt xérophiles, moins productives que les chênaies de Quercus robur et de Q. petraea, ce qui explique qu’elles soient plus exposées aux incendies. Ceci provoque la dégradation de la plupart d’entre elles, accentuée par l’abandon des traditionnelles exploitations de bois de chauffage et de charbon végétal. C’est pourquoi il est difficile de trouver de bons peuplements de bois de chênes tauzins, ainsi que des pieds de taille élevée. Ils s’installent à une altitude de variation supérieure à 1000 m, ce qui met en évidence une différence de température moyenne supérieure à 6 °C. Les précipitations annuelles moyennes sont de 1067,5 mm, la moyenne estivale est de 112,7 mm, ce qui signale une sécheresse estivale à certains endroits

    Site index model for natural stands of rebollo oak (<i>Quercus pyrenaica</i> Willd.) in Galicia, NW Iberian Peninsula.

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    <p>Data from stem analysis of 56 dominant trees of <em>Quercus pyrenaica</em> Willd., in natural stands in Galicia (NW Iberian Peninsula), were used to evaluate four dynamic site equations derived with the Generalized Algebraic Difference Approach (GADA). All the equations are base-age invariant and directly estimate height and site index from any height and age. The fittings were made using a data structure involving all possible growth intervals. The GADA formulation derived on the basis of the Bertalanffy-Richards model by considering the asymptote and the initial pattern parameters as related to site productivity. It is therefore recommended for height growth prediction and site classification for natural stands of rebollo oak in Galicia. The autocorrelation was analyzed with a test of residuals using Durbin's t-test without reaching a manifest result of autocorrelation between managed data.</p

    Comparison of 1-year outcome in patients with severe aorta stenosis treated conservatively or by aortic valve replacement or by percutaneous transcatheter aortic valve implantation (data from a multicenter Spanish registry)

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    The factors that influence decision making in severe aortic stenosis (AS) are unknown. Our aim was to assess, in patients with severe AS, the determinants of management and prognosis in a multicenter registry that enrolled all consecutive adults with severe AS during a 1-month period. One-year follow-up was obtained in all patients and included vital status and aortic valve intervention (aortic valve replacement [AVR] and transcatheter aortic valve implantation [TAVI]). A total of 726 patients were included, mean age was 77.3 ± 10.6 years, and 377 were women (51.8%). The most common management was conservative therapy in 468 (64.5%) followed by AVR in 199 (27.4%) and TAVI in 59 (8.1%). The strongest association with aortic valve intervention was patient management in a tertiary hospital with cardiac surgery (odds ratio 2.7, 95% confidence interval 1.8 to 4.1, p <0.001). The 2 main reasons to choose conservative management were the absence of significant symptoms (136% to 29.1%) and the presence of co-morbidity (128% to 27.4%). During 1-year follow-up, 132 patients died (18.2%). The main causes of death were heart failure (60% to 45.5%) and noncardiac diseases (46% to 34.9%). One-year survival for patients treated conservatively, with TAVI, and with AVR was 76.3%, 94.9%, and 92.5%, respectively, p <0.001. One-year survival of patients treated conservatively in the absence of significant symptoms was 97.1%. In conclusion, most patients with severe AS are treated conservatively. The outcome in asymptomatic patients managed conservatively was acceptable. Management in tertiary hospitals is associated with valve intervention. One-year survival was similar with both interventional strategies
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