Video Experimental Relacionado
Updated: Jul 11, 2026
09:33
A Technical Perspective in Modern Tree-ring Research - How to Overcome Dendroecological and Wood Anatomical Challenges
Published on: March 5, 2015
El comercio de madera tropical y el desarrollo sostenible
Science (New York, N.Y.)
|June 19, 1992
Resumen
Las políticas comerciales de madera tropical en los países en desarrollo a menudo conducen a prácticas insostenibles, no al crecimiento económico. Se necesitan revisiones para abordar las señales suprimidas de escasez de madera y promover una mejor gestión forestal.
Área de la Ciencia:
- Ciencias ambientales Ciencias ambientales.
- Silvicultura La silvicultura es la actividad forestal.
- Economía La economía es la economía.
Sus antecedentes:
- El comercio de madera tropical se caracteriza por patrones de exportación de auge y caída.
- Este patrón a menudo se atribuye a factores externos como la demanda de las naciones desarrolladas y los precios internacionales de la madera.
Objetivo del estudio:
- Investigar las raíces impulsadas por la política interna de la insostenibilidad del comercio de madera tropical.
- Determinar si las revisiones de políticas pueden fomentar el crecimiento económico sostenido y la gestión forestal.
Principales métodos:
- Análisis de las políticas de los países tropicales con respecto a las concesiones de madera.
- Examen de las políticas relacionadas con las industrias procesadoras de madera.
Principales resultados:
- El comercio de madera tropical no ha fomentado la gestión forestal sostenible o la industrialización.
- Los patrones de exportación están impulsados por políticas internas que oscurecen la escasez de madera.
- La revisión de estas políticas es crucial para el crecimiento económico sostenido.
Conclusiones:
- Las políticas de comercio de madera tropical requieren una revisión fundamental para evitar prácticas insostenibles.
- Incluso con cambios en las políticas, la silvicultura de rendimiento sostenible puede no lograrse a nivel nacional.
Videos de Conceptos Relacionados
01:43Sustainable Development
As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
01:19Introduction to Wood
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the wood...
The structural integrity of the wood...
01:21Wood Products
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
01:28Softwoods and Hardwoods
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
01:19Lumber
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
01:21Structural Properties and Dimensions of Lumber
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of wood are...
The strength characteristics of wood are...