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

Mostrando recursos 1 - 20 de 1,740

1. Prepared by: - British Columbia; J. Lange; C. Hawkins; Prince George Bc
Interest in managing broadleaf and mixedwood stands has grown due to increased demand for hardwood products and a shift towards more biological/ecosystem-based management. The current ‘default ’ operational practice is the elimination of the nonconifer component of the stand. Presently, there are no silviculture guidelines for managing mixed species stands in the sub-boreal spruce (SBS) biogeoclimatic one. When managed, they tend to be managed poorly due to a limited understanding of their dynamic processes and a lack of predictive models. Our current quantitative findings as well as model projections suggest spruce growth is promoted when growing at birch densities up...

2. A SHORT ROUTE TO GENE DISCOVERY IN TREES: CONTROL OF STATURE THROUGH GIBBERELLIN CATABOLISM - Victor B. Busov; Richard Meilan; Steven H. Strauss
Manipulation of plant stature has long been a major goal in agronomy, horticulture, and silviculture. Dwarf and semi-dwarf “Green Revolution ” varieties in wheat and rice contributed to dramatic increases in cereal crop yields. The new varieties were shorter, more resistant to damage by wind and rain (lodging), and responded better to nitrogen fertilizers by increasing grain yield rather than straw biomass. Dwarfing in fruit trees has allowed dense field cultivation, facilitated mechanized maintenance, increased efficiency of fruit collection, and allowed more precise pesticide application, reducing spray drift1. Most of the dwarfing rootstocks induced precocious and profuse flowering. Dwarf ornamental...

3. Estimación de variables dasométricas a partir de datos LiDAR y obtención de modelos de referencia para las distribuciones de alturas y diámetros del arbolado - Mauro Gutiérrez, Francisco
La Gestión Forestal Sostenible se define como “la administración y uso de los bosques y tierras forestales de forma e intensidad tales que mantengan su biodiversidad, productividad, capacidad de regeneración, vitalidad y su potencial para atender, ahora y en el futuro, las funciones ecológicas, económicas y sociales relevantes a escala local, nacional y global, y que no causan daño a otros ecosistemas” (MCPFE Conference, 1993). Dentro del proceso los procesos de planificación, en cualquier escala, es necesario establecer cuál será la situación a la que se quiere llegar mediante la gestión. Igualmente, será necesario conocer la situación actual, pues marcará...

4. Summary - Of Monosodium Methanearsonate; Silviculture Practices Branch
ii

5. Research Disciplines: Ecology ~ Geology ~ Geomorphology ~ Hydrology ~ Pedology ~ Silviculture Systems ~ Wildlife Relationships between Elevation and Slope at Barred Owl Sites in Southwestern British Columbia By - Jason Smith; Glenn D. Sutherland; Daniel T. O’brien; F. Louise Waterhouse; Joseph B. Buchanan; Jared Hobbs; Alton S. Harestad; Jason Smith; Glenn D. Sutherl; Daniel T. O’brien; F. Louise Waterhouse; Joseph B. Buchanan; Jared Hobbs; Alton S. Harestad

6. 19X9: Magnitude of upland silvicultural nonpoint sourcepollutioninfheSouth. Pp.X-IRi~Hook,D.D.:Lca,R.(Ed.)ProceedingsofaSyrnposium “The Forcsted Wetlands ofthe - H. Riekerk; D. G. Neary; W. T. Swank
Abstract.—Streamflow water quality data from intensive silvicultural practices in the southern United States are summarized and discussed with respect to regional differences of nonpoint source pollution, and Best Man-agement Practices. Suspended sediment production by silviculture was low in the mountains and lower coastal plain, but high in the Piedmont and upper coastal plain regions. This reflected an interaction between site pre-paration intensity and topographic relief. Cation nutrient export after harvesting in the mountains was increased by higher nitrate carrier-ion production and by more runoff. Nutrient exports in the Piedmont and upper coastal plain regions were controlled by the degree of...

7. Mental stress on harvester operators - Christiane Berger
Abstract: High tech operations in Austrian forestry are persistently increasing. Although mechanization relieves men from heavy physical work some new forms of stress become apparent. Very long working days (up to 15 hours), short and bad organized brakes as well as financial responsibility for expensive machines are the most important stress-causing factors. Furthermore harvester operators have to deal with a flood of information during work and additional knowledge of technology and silviculture is often required. In contrast to these demands most harvester operators are insufficiently prepared for their job: average training lessons last only for 4.2 days resulting in a...

8. Eastern Hemlock Response to Even- and Uneven-Age Management in the Acadian Forest: Results from the Penobscot Experimental Forest Long-Term Silviculture Study - John C. Brissette; Laura S. Kenefic; Prince Edward Isl
Abstract age management and most of their associated silvicultural systems. Eastern hemlock (Tsuga canadensis (L.) Carr.) is an important tree species in the mixed-species conifer forests The Penobscot Experimental Forest (PEF) is located in the of northern New England and adjacent Canada. Hemlock is towns of Bradley and Eddington, in Penobscot County, Maine. very tolerant of understory conditions; consequently, it It is 4,000 acres in size and centered at approximately responds differently to various silvicultural treatments. In a 44'52'N. 68'38'W. The PEF was established in 1950 for the long-term study at the Penobscot Experimental Forest in purpose of conducting timber...

9. An efficient micro-method of DNA isolation from mature leaves of four hardwood tree species Acer, Fraxinus, Prunus and Quercus - Lefort, François; C. Douglas, Gerard.
International audience

10. As transformações socioeconômicas e ambientais do cultivo de eucalipto e acácia negra no município de Arroio dos Ratos – RS - Lima, Letícia de
A silvicultura é uma atividade que historicamente se fez presente no município de Arroio dos Ratos- RS durante a produção carbonífera. Principalmente nos primeiros anos do séc. XX, o esgotamento das reservas naturais de madeira condicionou a companhia que explorava carvão, a destinar áreas de terra para o plantio de Eucalipto para reposição da madeira utilizada na produção de dormentes e escoras das minas de carvão. O desenvolvimento dos plantios de Eucalipto e Acácia Negra em grande escala surgiram de acordo com uma demanda necessária para atender o mercado consumidor com a produção de madeira em tora para produção de...

11. Dinâmicas socioambientais e disputas territoriais em torno dos empreendimentos florestais no Sul do Rio Grande do Sul - Binkowski, Patrícia
Nas últimas décadas, o cenário mundial foi marcado pela migração de empresas produtoras de madeira para celulose e papel do hemisfério norte para o hemisfério sul, provocando uma nova espacialização dos plantios de arbóreas, entre elas, eucalipto, acácia e pinus. A implantação desses grandes projetos tem desencadeado mudanças nas práticas sociais e no meio natural nos espaços rural e urbano de determinadas regiões, como é o caso do sul do Rio Grande do Sul. Este estudo se destina a analisar e compreender como e por que se expandiu a atividade florestal em um dos municípios desta região, Encruzilhada do Sul,...

12. 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...

13. 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...

14. 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...

15. 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...

16. 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...

17. 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.

18. 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

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

20. 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.

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