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Nomenclatura Unesco > (31) Ciencias Agrarias > (3106) Ciencia forestal > (3106.08) Silvicultura

Mostrando recursos 1 - 20 de 1,729

1. Modeling alternative zoning strategies in forest management - Emina Krcmar; Ilan Vertinsky; G. Cornelis Van Kooten
To satisfy public demands for environmental values, forest companies face the prospect of reduced wood supply and increased costs. Some Canadian provincial governments have proposed intensifying silviculture in special zones dedicated to timber production as the means for pushing out the forest possibilities frontier. In this paper, we compare the traditional two-zone land allocation framework, which includes ecological reserves and integrated forest management zones, with the triad (three-zone) scheme that adds a zone dedicated to intensive timber production. We compare the solutions of mixed-integer linear programs formulated under both land allocation frameworks and, through sensitivity analysis, explore the conditions under...

2. WHAT ARE THE OPINIONS OF FORESTERS IN PORTUGAL REGARDING FIRE? RESULTS OF A QUESTIONNAIRE. - M. ª Conceição; Castro Rego
Portugal has a problem with forest wildfires. Through out the years, the number of fires and area burned has increased. Forest engineers are one of the professional groups most involved in the prevention of wildfires, not only in the field of preventive silviculture but also in the area of rural extension. Some of the objectives of this work are to know the opinions of these foresters regarding: The major threats to the Portuguese forests; What should be done to prevent wildfires in Portugal. Adequacy of Prevention/detection/extinction of wildfires in Portugal; On what situation fire can be used as a working...

3. Probability of occurrence and habitat features for Oriental bittersweet in an oak forest in the southern Appalachian mountains - W. Henry Mcnab; David L. Loftis
Oriental bit tersweet (Cc1a.rtru.s or-biculutus), an introduced vine from southeast Asia, has become a serious threat to native forests in the eastern United States. It is typical of many exotic species in that quantitative ecological relationships are unavailable for assessment or management. We devised a rapid survey technique useful for hazard rating and modeled the probability of occurrence of oriental bittersweet in relation to environment, competition, and disturbance in stands of deciduous hardwoods in mountainous terrain. Oriental bittersweet was present on 39 % of the study area, which has been managed by the selection system of silviculture and was recently...

4. Silviculture and forest aesthetics within stands. The New York Center for Forestry Research and Development - Robin E. Hoffman; James F. Palmer
One of the original goals of environmental perception research was to allow the prediction of scenic beauty based on landscape attributes, with much of this effort focusing on the forested landscape. For instance, Shafer, Hamilton and Schmidt (1969) sought: … to identify what quantitative variables in a natural landscape are significantly related to public preference for that landscape. By knowing what quantitative features in a landscape affect its aesthetic appeal, natural resource planners can make decisions on a factual basis about purchasing, developing, or preserving these features. With 25 years of empirical research investigating the relationship of landscape attributes to...

5. Silva Fennica 36(4) research articles Sensitivity of Picea abies to Butt Rot in Pure Stands and in Mixed Stands with - Pinus Sylvestris In Southern Sweden; Magnus Lindén; Gudmund Vollbrecht
Repeatedly sampled data from permanent experimental plots in southern Sweden were used to model butt rot development in Norway spruce growing in pure stands and in mixed stands with Scots pine. The data come from 29 sites with pure spruce, altogether 100 plots, and from 15 sites of mixed spruce and pine, altogether 22 plots. A logistic model provided the best fi t to the data. The study material revealed that in mixed stands the proportion of spruce trees with butt rot is lower than in pure Norway spruce stands. The difference in the incidence of butt rot cannot be...

6. Proceedings of the National Silviculture Workshop : successes in silviculture : Rapid City, South Dakota, May 13-16, 1985. - National Silviculture Workshop; United States. Forest Service. Division of Timber Management.
Includes bibliographies.

7. Sustainable management of Eucalyptus plantations in a changing world - Dan Binkley; José Luis Stape
development of a novel kind of forestry: plantations of fast-growing Eucalyptus species. Intensive work on genetics and silviculture doubled the productivity of these plantations every ten to twenty years. Forestry has always been concerned with the long-term sustainability of tree growth, classically focusing on sustained soil fertility. Rapid increases in Eucalyptus growth and the vast size of plantations add new aspects to sustainability. Massive plantations of genetically uniform monocultures have moved Eucalyptus silviculture into the domain of classic sustainability issues from agriculture: genetic uniformity, pests and pathogens, and environmental impacts of intensive land

8. eastern hemlock forest in Maine, USA - Gary J. Hawley
Silviculture alters the genetic structure of an

9. Evaluación de crecimiento inicial en tres especies del género Inga en sistema agroforestal - ANTÓN DE LOS ÁNGELES, ANA
Las especies de Inga son un componente omnipresente en los bosques pluviales de la llanura y montanos a lo largo de las zonas húmedas de Latinoamérica tropical. Además de su importancia en el mercado alimenticio, el género Inga ha sido valorado por su amplio uso como árbol de sombra.El género Inga concretamente, es convenientemente adecuado para su uso en sistemas agroforestales debido a sus diversos aprovechamientos; pues es tolerante a suelos empobrecidos, su crecimiento es rápido, tiene gran adaptabilidad ecológica y es capaz de fijar el nitrógeno del suelo, y aportar biomasa después de la poda utilizada como abono verde o para el control de malezas.Siendo que el estudio de crecimiento e incremento de árboles es de interés de los silvicultores con el propósito de determinar su respuesta y su proyección a un determinado tiempo para un mejor manejo de los bosques y que se pueden ajustar modelos de crecimiento a partir de las observaciones de incremento o bien de los promedios de estosla presente investigación pretende contribuir al conocimiento de la información del crecimiento. De este modo se podrá saber de biomasa, tasa de producción y la respuesta de los árboles, pudiéndose así tomar decisiones racionales en cuanto al manejo. El objetivo de este Proyecto es contribuir al conocimiento de la adaptación y características del crecimiento inicial de 3 especies del genero Inga, para su posterior evaluación de la producción de biomasa y reciclaje de nutrientes en un sistema agroforestal de café bajo sombra.

10. RESPONSABILIDAD SOCIAL EN LA CONSELLERIA DE INFRAESTRUCTURAS, TERRITORIO Y MEDIO AMBIENTE: PROPUESTA PARA LA APLICACIÓN DEL MODELO GRI E ISO 26000 - LÓPEZ PATIÑO, JESÚS
El siguiente TFC consiste en una propuesta para la introducción de la Responsabilidad Social en la gestión de la Conselleria de Infraestructuras, Territorio y Medio Ambiente de la Generalitat Valenciana. Esta responsabilidad social tiene, en este caso concreto un doble carácter, en primer lugar por tratarse de una administración pública, que además de promover e incentivar la aplicación de criterios responsables en la gestión de las organizaciones de carácter privado, debe dar ejemplo y gestionarse a su vez de manera responsable, y en segundo lugar por ser una Conselleria entre cuyas competencias figura la protección del medio ambiente en el...

11. Vocabulari Forestal - Xarxa Vives d'Universitats
Vocabulario forestal catalan, castellano, inglés y francés

12. Projecte d' adequació de infraestructures per a la prevenció i l'extinció de incendis forestals en la partida de "Gamellons" als termes municipals d' Ontinyent, Beneixama i Fontanars - Rodríguez Belda, Aleix
El projecte, consisteix en la realització d'un depòsit d'aigua per a acumular-la i fer-la servir en l'extinció d'incendis forestals. La realització d'aquest projecte implica una actuació també en el vial existent, tant en la capa de rodadura per oferir una accés el més ràpid possible, com en la correcta evacuació d'aigües d'aquest camí, de manera que no es produïsquen clots i fer-les més duradores. D'altra banda, i tractant-se d'infraestructures forestals per a l'extinció d'incendis forestals, es procedirà a l'ús de la silvicultura preventiva per a realitzar dues faixes auxiliars adjacents al camí de manera que amb el resultat de la unió...

13. Certified Organic Forests & Timber: the Hippocratic Opportunity - John Paull
Organic farming was proposed in 1940 by Lord Northbourne as a response to chemical agriculture. Since then, organic agriculture has developed into an international A$50 billion industry with an-nual growth reported up to 30%. Currently it is one of the fastest growing food sectors with demand exceeding supply in many markets, and price premiums averaging 80 % in Australia. With eco-nomic, and now environmental, incentives for planting trees, there is the opportunity, and even im-perative, for a new silviculture category that embraces the precepts of organic agriculture. There are environmental, economic and ethical issues with carbon offset programmes that seek...

14. Using silviculture to achieve a desired future condition for biological diversity in the southern region. Pages 4041 - Jim Fenwood
Where silvicultural objectives for a stand may once have been relatively simple, they are now often considerably more complex. Today we are concerned with how our actions affect a wide variety of organisms. Furthermore we are charged by law (NEPA, NFMA, and ESA) to actively man-age National Forests for the maintenance of biological di-versity. We began the process in the South first by restoring the forests and later by mitigating adverse effects of timber harvesting on certain animals and plants. Today, public acceptance for traditional forestry practices is declining. Project implementation is most successful when approached as a process of...

15. Research Disciplines: Ecology ~ Geology ~ Geomorphology ~ Hydrology ~ Pedology ~ Silviculture ~ Wildlife - T. Rollerson; T. Millard; C. Jones; K. Trainor; B. Thomson

16. in S5 and S6 streams near Boston Bar, - Ecology Geology; Geomorphology Hydrology; Pedology Silviculture Wildlife; Chilliwack Forest District; Thomas Millard; Ecology Geology; Geomorphology Hydrology; Pedology Silviculture Wildlife
Transport of logging slash and sediment

17. Value of Complete Information on Red Heartwood Formation in Beech (Fagus sylvatica) - Thomas Knoke
Beech (Fagus sylvatica L.) is the most important deciduous tree species in Germany. The wood of beech shows normally a bright colour (white beech) as long as no coloured heartwood has been formed. The facultative heartwood formation is induced when oxygen enters central parts of older trees, where dead or at least less vital parenchyma exist. The coloured heartwood is usually called ‘red heartwood’. Beech without red heartwood can preferably be found in younger trees which show a high water content even in central parts of the stem. The presence of red heartwood is regarded as a severe reduction of...

18. Research and development for sustainable management of semiarid miombo woodlands in East Africa - Lawrence Mbwambo; Sauli Valkonen; Varpu Kuutti
The purpose of the study was to assess the feasibility of the empirical individual tree-level, spatial-ly explicit research approach, combined with experimental silvicultural treatments, to study stand structure and dynamics under miombo conditions. Additionally, preliminary results on key struc-tural and dynamic features of the experimental stands at Kitulangalo Forest Reserve, Tanzania are presented based on a short (12-month) observation period. Stand structures were very complex with species, tree size and tree location intermixed in various ways. Trees of the highly desirable, primary timber species constituted a majority (55%) of the current standing volumes. Ample regeneration of the primary and other...

19. FORESTED WETLANDS: WHERE SILVICULTURE IS CRITICAL TO THE FUTURE OF SILVICULTURE - John R. Toliver
Applying "normal silvicultural activities " through state-of-the-art "Best Management Practices " (BMP's) is crucial to maintaining exemptions from the permit requirements of the 1977 Clean Water Act (CWA) regarding silvicultural practices in forested wetlands. This paper discusses the ba-sic history behind defining and delineating wetlands in the United States. Normal silvicultural exemptions are ad-dressed as they are interpreted by the U.S. Army Corps of Engineers and as they relate to BMP's in wetland and bot-tomland forests. The Southern Region (R-8) and Southern

20. $rec.titulo - Richard Thompson; Colin Edwards; Bill Mason
Silviculture of upland native woodlands Recognition of the value of native woodlands, particularly Ancient Woodlands, has been increasing in recent years. At an international level the importance of such natural habitats was emphasised at the Rio Earth Summit in 1992 and in the resolutions of

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