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

Mostrando recursos 1 - 20 de 1,706

1. $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

2. What Are the Implementation Rates and Effectiveness of BMPs in the South? - Bruce A. Prud’homme; John G. Greis; Key Findings
• The nonpoint source (nps) pollutant of greatest concern to forest management is sediment, which reaches stream channels primarily through erosion. Rainsplash and sheet erosion account for the majority of hillslope erosion. • Maintaining channel stability and the hydrologic character of the watershed can control stream channel erosion and maintain the sediment/stream energy relationship. • Silvicultural Best Management Practices (BMPs) are designed to reduce nonpoint source pollution and maintain stream channel integrity so that State water quality standards are met. Where their effectiveness has been evaluated, they have achieved that goal. • All States have adopted silviculture BMPs and have...

3. Journal of Tropical Forest Science 17(4): 610--624 (2005)610 STOCKING GUIDELINES FOR THE ENDEMIC HAWAIIAN HARDWOOD, ACACIA KOA - P. J. Baker; P. G. Scowcroft
Hawaiian hardwood, Acacia koa. Stocking relationships are an important tool for foresters because they provide a means for evaluating how effectively the trees in a stand use available growing space. While stocking guidelines are not available for many tropical tree species, readily obtained measurements of stem and crown diameters can be used to develop preliminary stocking guidelines for most tree species. We demonstrate this approach for the endemic Hawaiian hardwood, Acacia koa, a species of major ecological and economic value in Hawaii. Using data from repeated censuses of multiple sites, we evaluated the influence of site quality and stand age...

lantations with native tree species in Chile are scarce, despite the fact that the Forest Service has promoted them for more than a decade. The three most widely planted trees are exotic (Pinus ra-diata [D. Don], Eucalyptus globulus [La-bill], and E. nitens [Deane & Maiden]). Among native trees, several Nothofagus species seem to be the most promising. According to the last agricultural census there are ~4000ha of Nothofagus planta-tions in Chile, a rather small area that can be the result of a lack of high-quality seedlings, a poor knowledge about the plantation silviculture for these species,

5. Strength grading and the end user—Lessons from the SIRT project at Napier University - Dan Ridley-ellis; John Moore; Andrew Lyon
The paper reviews the research that has been undertaken by the Strategic Integrated Research in Timber (SIRT) project at Napier University, with reference to the technologies, techniques and approaches required to grade the UK’s timber resource according to the real needs of the end user. The project has been operating since 2004, and has made significant progress in understanding the nature and variability of UK-grown Sitka spruce. It has been seen that UK-plantation Sitka spruce can yield timber of grade C24, and that with the right breeding and silviculture it may indeed be economic to aim higher than the current...

6. For submission to: Mitigation and Adaptation Strategies for Global Change - Philip M. Fearnside
1 Activities in Brazil's forest sector have substantial potential for mitigating global warming as well as additional environmental and other benefits. Silvicultural plantations of different types, reduced impact logging, and deforestation avoidance all have potential mitigation roles. The magnitude of the annual emission from recent rates of deforestation in Amazonia, which averaged 392 × 106 Mg C/year over the 1981-1990 period, presents an opportunity for carbon benefits through reducing current rates of deforestation. Measures related to Amazonian deforestation have greater potential carbon benefits than do options such as plantation silviculture, but much depends on how benefits are calculated. Procedures are...

7. Estudios corológicos de plantas vasculares en la cuenca media del Tajo - Martínez Labarga, Juan Manuel
Se ha realizado un estudio de la distribución de plantas vasculares en un territorio situado entre las provincias de Cuenca, Guadalajara, Madrid y Toledo (España). El territorio estudiado está en la Submeseta Sur de la península ibérica, al sur del Sistema Central, norte de los Montes de Toledo y oeste del Sistema Ibérico, en zonas sedimentarias con poco relieve y clima mediterráneo, con grandes contrastes de temperatura y precipitaciones muy irregulares. Coincide con las regiones naturales llamadas: “Alcarrias”, “Campiñas de Madrid y Guadalajara” y “Vegas de los ríos de la Cuenca del Tajo”. Es lo que he llamado Cuenca Media...

8. Ecología y silvicultura de especies útiles amazónicas: Abarco (Cariniana micrantha Ducke), Quinilla (Manilkara bidentata (A. DC.) A. Chev.) y Violeta (Peltogyne paniculata Benth.) - Rivera-Martin, Luis Eduardo; Peñuela-Mora, Maria Cristina; Jiménez Rojas, Eliana María; Vargas Jaramillo, María del Pilar

9. Perspectives on the ecology and silviculture of oak-dominated forests in the central and eastern states / - Johnson, Paul S.; North Central Forest Experiment Station (Saint Paul, Minn.)
Cover title.

10. Effects of Lymantria dispar, the Gypsy Moth, on Broadleaved Forests In Eastern North America - Sara Fabel
Lymantria dispar (L.) (the gypsy moth), a species native to Eurasia, was introduced to North America in the late 1800’s. Since its introduction, L. dispar has plagued the eastern deciduous forests causing severe defoliation, and sometimes subsequent disease and/or death. Many efforts have been made to eradicate the leaf-munching caterpillar. These efforts include biological control using parasites, fungi, and viruses, silviculture methods, insecticide application, as well as public education about L. dispar transport. Some management techniques have been shown to reduce population numbers, but most just aim at preventing future dispersal and growth. New populations, however, are introduced or reintroduced...

11. A SUSTENTABILIDADE da cultura do eucalipto: programa 03.
Atualmente, a eucaliptocultura vem ganhando espaço dentre outras atividades, principalmente as pastagens, tornando-se uma alternativa para pequenos e médios agricultores. A Embrapa Monitoramento por Satélite, localizada em Campinas, no interior de São Paulo, utiliza tecnologia dos satélites e levantamentos em campo para avaliação dos impactos da silvicultura em regiões com alta concentração dessa atividade. O objetivo é oferecer subsídios para o planejamento regional e gestão ambiental das propriedades e gerar indicadores de sustentabilidade ambiental que possam ser aplicados em outras propriedades rurais do setor.O eucalipto é recurso renovável, utilizado cada vez mais na geração de energia para o fornecimento de...

12. Proyecto de construcción de una vía forestal en Villaviciosa de Odón (Madrid) - Gil Alcalde, Israel
El proyecto objeto de estudio consiste en la ejecución de una vía forestal en el Término Municipal de Villaviciosa de Odón, Comunidad de Madrid. La obra proyectada va a aumentar la transitabilidad de la zona ya que une el Camino de Vereda Vedada perteneciente al término municipal de Villaviciosa de Odón con el Camino del Egido ya en el límite con el término municipal de Brunete, atravesando la Dehesa de Guadarrama, mejorando la accesibilidad al monte y a las fincas agrarias y, de este modo, potenciar los usos ya mencionados anteriormente, las labores silvícolas y tareas de extinción de incendios. En...

13. Proyecto de construcción de vía forestal en el término municipal de Villoslada de Cameros (La Rioja). - Rubio Márquez, Laura
El proyecto objeto de estudio consiste en la construcción de una vía forestal del tipo camino de tierra. Su trazado tiene una longitud total de 1724.771 metros, y transcurre por el término municipal de Villoslada de Cameros,Comunidad Autónoma de La Rioja. La construcción de dicho proyecto dará lugar a una mejora notable en la red de comunicación de dicha zona, además de favorecer los usos agro-forestales y recreativos de Villoslada de Cameros. La obra proyectada va a aumentar notablemente la transitabilidad de la zona. En caso de existir incompatibilidades entre la conservación de los recursos naturales del monte y la construcción de...

14. 2003 Kluwer Academic Publishers. Printed in the Netherlands. Silvicultural intensification for tropical forest conservation - Todd S. Fredericksen; Francis E. Putz
conservation Abstract. Minimizing the deleterious environmental impacts of logging and other silvicultural treatments is the primary conservation goal in tropical forests managed for timber production. While it is always environmentally beneficial to minimize unnecessary damage, more intensive silviculture should not be discouraged in tropical forests in which regeneration and growth of commercially valuable timber species requires such treatments. Failing to regenerate commercial species may render forests more susceptible to conversion to other, more lucrative land uses. Increasing the intensity of silviculture may also decrease the total area of forest exploited for timber, thereby reducing the impacts of over-hunting, timber theft,...

15. $rec.titulo
Abstract—The long history of deer overabundance in Pennsylvania is associated with very high reforestation costs and substantial threats to diversity and sustain-ability. In response to this legacy, several landowners and agency personnel formed the Kinzua Quality Deer Cooperative (KQDC) in partnership with the Sand County Foundation. This Cooperative focuses on about 74,000 acres in the northeast corner of the Allegheny National Forest (ANF), the setting for the Sugar Run Project under planning by the ANF at present. The goals of the KQDC are to develop a quality deer herd in quality habitat through cooperation with local sportsmen and sports-women. In...

16. Structural Lineaments Derived from Planforms of Watercourses in the Second Military Survey of the Habsburg Empire - Gábor Kovács
Second Military Survey of the Habsburg Empire, carried out in the 19th century, can be very useful in different scientific investigations owing to its accuracy and data content. The fact, that the mapmakers used geodetic projection, and the high accuracy of the survey guarantee that scientists can use these maps and represented objects can be evaluated in retrospective studies. The streams were drawn with very thin lines that also ascertain the high accuracy of their location. The goal of the study was the neotectonic evaluation of the western part of the Pannonian Basin, bordered by Pinka, Rába and Répce Rivers....

17. Tree Improvement and Silviculture Component - Jens-peter Barnekow Lillesø; Lokendra Purush Dhakal; Lokendra Purush Dhakal; Jens-peter Barnekow Lillesø; Prem Kant Jha; Hem Lal Aryal; Erik Dahl Kjaer; Danida Forest; Seed Centre; Hatisar Naxal
Tree Improvement and Silviculture Component (TISC) of the Natural Resource Management Sector Assistance Programme (NARMSAP) supported by Danida and Danida Forest Seed Centre (DFSC) Cover photo: Cattle grazing in the Terrai region, Nepal. Branches and leaves are important nutrients for the cattle. Branches are also used for bedding. Photo. Erik Kjaer 1998. Citation:

18. $rec.titulo
itie an c,1 b indicate that a variety of factors may influence whether or not silvicultural practices are adopted. These range from (knowledge, motivation, etc.) to wider geographical, economic and political influences. Forest researchers and policy-makers will better identify key constraints and opportunities for the world settings suggests that the adoption of improved Forest Ecology and Managementsilviculture by targeted end-users cannot be taken for granted. In fact, a theme which cross-cuts most research on the adoption and diffusion of novel silvicultural and related practices is that barriers to

Mangroves, the only woody halophytes living at the confluence of land and sea, have been heavily used traditionally for food, timber, fuel and medicine, and presently occupy about 181 000 km2 of tropical and subtropical coastline. Over the past 50 years, approxi-mately one-third of the world’s mangrove forests have been lost, but most data show very variable loss rates and there is considerable margin of error in most esti-mates. Mangroves are a valuable ecological and economic resource, being important nursery grounds and breeding sites for birds, fish, crustaceans, shell-fish, reptiles and mammals; a renewable source of wood; accumulation sites for...

20. Review Article Plant Growth-Promoting Bacteria: Mechanisms and Applications - Bernard R. Glick
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. e worldwide increases in both environmental damage and human population pressure have the unfortunate consequence that global food production may soon become insufficient to feed all of the world’s people. It is therefore essential that agricultural productivity be signi�cantly increased within the next few decades. To this end, agricultural practice is moving toward a more sustainable and environmentally friendly approach. is includes both the increasing use of transgenic plants and plant growth-promoting bacteria as a part of mainstream agricultural practice. Here, a number...

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