Mostrando recursos 1 - 20 de 2.623

  1. The multiple dimensions of rural forests: lessons from a comparative analysis

    Genin, Didier; Aumeeruddy-Thomas, Yildiz; Balent, Gérard; Nasi, Robert
    International audience

  2. Caracterización energética de Quercus robur L.

    González Rodríguez, Alberto Jesús
    En esta Tesis se buscan justificaciones sólidas que respalden la implantación de un proceso de silvicultura eficaz aplicable a las masas de Quercus con el doble objetivo de sanearlas a la vez que extraer de ellas biomasa forestal de calidad utilizable en procesos de producción energética a pequeña escala. Para conseguir estos dos objetivos debemos primero plantear la importancia actual del carballo en Galicia en su contexto más global y justificar así una inversión importante en labores silvícolas de ordenación y saneamiento de estas formaciones forestales, y en segundo lugar, y mediante un exhaustivo estudio de sus propiedades térmicas, su...

  3. Forestación, territorio y ambiente : 25 años de silvicultura trasnacional en Uruguay, Brasil y Argentina

    Gautreau, Pierre
    International audience

  4. Identificação de áreas prioritárias para conservação na sub-bacia do Arroio-Retiro – RS

    Fiori, Diana
    Muitos dos severos impactos causados ao ambiente nos dias atuais estão intimamente relacionados com a total ou parcial retirada da cobertura vegetal nativa do solo. Com o crescimento acelerado da população humana, a vegetação nativa bem como outros recursos naturais está sofrendo uma crescente pressão. Esta, por sua vez, influencia diretamente a perda e fragmentação de habitats, repercutindo em danos significativos na biodiversidade local e regional. Nestas condições, a sub-bacia hidrográfica do arroio Retiro, localizada nos municípios de Veranópolis, Vila Flores, Cotiporã e Nova Prata, estado do Rio Grande do Sul, apresenta grande fragmentação florestal, principalmente em função do elevado...

  5. Récolte de bois de feu au Niger et une généralisation de la formule de Faustmann

    Bacaër, Nicolas; Bah, Alassane; Mahamane, Ali
    Traduction de: Fuelwood harvesting in Niger and a generalization of Faustmann's formula. C. R. Biol. 328 (2005) 379-385.

  6. $rec.titulo

    Brahic, É.
    Le caractère de bien public de la biodiversité conduit à une détérioration des biens et services qui en sont issus. L'intervention des pouvoirs publics est alors nécessaire pour réconcilier les intérêts publics et privés et éviter les comportements de passager clandestin. Ils disposent notamment d'un outil contractuel : les PSE. Afin d'accroître l'efficacité de ces PSE, de plus en plus de programmes utilisent des enchères pour allouer les contrats de conservation. Dans cet article, nous nous intéressons à plusieurs de ces programmes, l'objectif étant d'initier une première réflexion sur les perspectives d'allocation des PSE par enchères au sein des forêts...

  7. Climate Change and Active Reef Restoration—Ways of Constructing the “Reefs of Tomorrow”

    Baruch Rinkevich
    Abstract: The continuous degradation of coral reef ecosystems on a global level, the disheartening expectations of a gloomy future for reefs ’ statuses, the failure of traditional conservation acts to revive most of the degrading reefs and the understanding that it is unlikely that future reefs will return to historic conditions, all call for novel management approaches. Among the most effective approaches is the “gardening ” concept of active reef restoration, centered, as in silviculture, on a two-step restoration process (nursery and transplantation). In the almost two decades that passed from its first presentation, the “gardening ” tenet was tested...

  8. Climate Change, Carbon Offsets and Certified Organic Forestry

    Paull J; Forest Stewardship Council (fsc
    Carbon offset programmes are creating a new breed of forester. These are retail carbon offsetters who respond to opportunities to offset the carbon footprint of their lifestyle, for example travel, by paying for tree planting. This new cohort of de facto foresters act out of their green values and/or ecological awareness. However since modern silviculture is chemically based, the obverse of their carbon offsetting, is pesticide onsetting- consequently their “solution ” is at best dirty green. Forestry standards, FSC, PEFC and SFI, are all very weak standards and allow pesticides and fertilizers. IFOAM previously rejected the adoption of an Organic...

  9. Silviculture and stand dynamics in Scots pine forests in Great Britain; implications for biodiversity

    W. L. Mason
    There are 241,000 hectares of Scots pine forest in Great Britain or about 10 percent of the total forest area. Traditionally, a distinction has been drawn between a small area of native pinewoods with high conservation value in northern Scotland and the younger plantations of Scots pine to be found in many parts of Britain. The latter have been primarily managed for timber although they are now expected to meet multipurpose objectives including enhanced biodiversity. Silvicultural practices in the plantations are based upon a system of clear fell-ing and artificial regeneration. However, older plantation stands can be colonised by rare...

  10. Title: Silviculture-Ecology of three native California hardwoods on


    high sites in north central Califoiia Signature redacted for privacy.Abstract approved Alan B., erg:.-Pacifié madrone, tanoak, and California black oak are the most economically promising native California hardwoods. Volume and value data indicate upward trends in growing stock levels and prices received for thei products. These trends are likely to continue. They suggest research is particularly needed for: (1) seed fall and regeneration, (2) sprout growth and development, (3) stand growth and yield, and (k) species adaptation and strategy. Much new material in these categories is presented here. 'The ability to produce copious amounts of seed at frequent inter-vals is...

  11. WIS.2 – A SUSTAINABLE FOREST MANAGEMENT DECISION SUPPORT SYSTEM

    Christian Rosset; Clotilde Gollut
    Abstract. WIS.2 is a DSS for monitoring and implementing the goal-oriented and sustainable manage-ment of forest ecosystems, especially with regard to the integral management of significant spatial and temporal scales in forest ecosystems. WIS.2 considers multiple ecosystem goods and services in silvicul-tural management and the implementation of silvicultural interventions, which are in accordance with the Swiss silvicultural tradition. WIS.2 takes a top-down approach, starting with the entrepreneurial strategy, and ending at short and mid-term interventions at stand level. WIS.2 structures the overall decision pro-cess across multiple scales and provides decision support for each decision to be taken by organizing and...

  12. Influence of Residual Basal Area on Longleaf Pine (Pinus palustris Mill.) First Year Germination and Establishment under

    Selection Silviculture; Ferhat Kara; Edward F. Loewenstein; F. Kara; E. F. Loewenstein
    Even-aged silvicultural methods have been successfully used to manage longleaf pine (Pinus palu-stris Mill.) forests for wood production; however, successful use of uneven-aged methods to man-age this ecosystem is less well documented. In this study, the effects of varying levels of residual basal area (RBA) (9.2, 13.8, and 18.4 m2∙ha−1) on longleaf pine germination and establishment un-der selection silviculture marked using the Proportional-B method were observed. In addition to RBA, photosynthetically active radiation (PAR) was measured, and the relationships between light penetration, germination, and growth were examined. The study found an inverse relationship between RBA and the number of germinants,...

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    With the introduction of a new conceptual model for forestry aiming at more naturalness in stand management (i.e. ‘ close-to-nature silviculture ’ or ‘ continuous-cover silviculture ’ ) around 1985 in

  14. $rec.titulo


    Forestry research to support the transition towards a bio-based economy Piermaria Corona1* This special issue is dedicated to the celebration of the 92nd anniversary of the Forestry Research Centre of the Italian Agricultural Research Council. The Centre originated in 1922 as Royal Experimental Station of Silviculture, joined to the Chair of Silviculture of the Royal Institution for Upper Education in Forestry of Firenze (Italy). Aldo Pavari, eminent scientist and teacher at the University of Firenze, was the fi rst director from 1922 up to his death in 1960. On the year 1967, the Experimental Station was reorganized as Experimental Institute...

  15. Quality Control and Productivity in Oak Timber- From Forest to the Primary Processing

    João P. F. Carvalho; José A. Santos; Joana Santos
    Oak timber is valuated for its beauty, good mechanical properties and natural durability and may have multiple uses. An understanding of the factors that affect oak timber quality is essential. It is important to have quality control of physical, mechanical and technological wood characteristics in order to define the better primary processing and end-use. Silviculture may significantly impact wood quality and final stand value. Specific prescriptions will depend on species, site conditions, desired end product and management options. An appropriate silviculture with optimized technological operations allows a well use of wood even with small diameters. Adequate wood classification is required...

  16. Vegetative Propagation of Conifers as a means of Intensifying Wood Production In Britain*

    W. L. Mason; J. G. S. Gill
    Estimates suggest that intensified silviculture using improved genotypes could raise productivity of existing forests in Britain by 30 per cent, thus reducing reliance upon imported timber. This increase is most readily attainable in upland coniferous forests where Sitka spruce is the major species. Superior families of Sitka spruce can now be identified with a ten per cent increase in vigour over ordinary seed lots. However, supplies of improved seed will not be available in significant quantities until after 2000. Research into vegetative propagation was begun to speed the introduction of improved material into commerce. Early work on the propagation of...

  17. UNIVERSIDAD DE CONCEPCION

    Facultad De; Ciencias Forestales; Programa De; Doctorado En; Ciencias Forestales; Dinámica Del; Carbono Y Otras; Interacciones En; Praderas Naturales; Establecidos En; Suelos Volcánicos; Profesor Guía; Miguel Espinosa Bancalari; Dpto Silvicultura; Facultad De Ciencias Forestales; Francis Dube Laplante
    Tesis para ser presentada a la Dirección de Postgrado de la Universidad de Concepción

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    With the introduction of a new conceptual model for forestry aiming at more naturalness in stand management (i.e. ‘ close-to-nature silviculture ’ or ‘ continuous-cover silviculture ’ ) around 1985 in

  19. n.oRed Alder Stands

    Michael C. Bondi; Extension Agent (forestry; William H. Emmingham; Extension Silviculture
    A nt reg gIt doesn’t come easy! Does any of your woodland property look like the alder stand at the left? If your goal is to convert this kind of ground to a productive conifer forest, you should know it can be a challenging task. You’ll have to do something with all that brush in the understory of the alder stand. Then there’s all the leftover wood after an alder harvest—it may need special treatment, too. And don’t forget animal damage. Even though we don’t see them here, you can bet big game and rodents will be around to feed...

  20. CONTENTS

    Hardwood Silviculture; J. M. Jarvis; I Troduction
    and those private companies whose co-operation made thi survey possible.

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