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espanolExtracciones maderables no planificadas inciden negativamente en la reduccion de cobertura boscosa, un manejo adecuado y planificado con extracciones menores a la produccion natural permiten conservar por mayor tiempo y de forma sostenible un rodal, en beneficio de poblaciones locales y del mismo ecosistema. En la cuenca de Acero marca se tiene dos rodales de Alnus acuminata que son extraidas de forma continua. Con el fin de planificar la extraccion de recursos maderables se construyeron y evaluaron modelos matriciales de cosecha para el aprovechamiento sostenible de esta especie en base a estructuras de edad. Para ello se trabajo dos estructuras de edad siguiendo un analisis dendrocronologico y modelo demografico de la masa forestal, a partir de toma de informacion local mediante transectos Gentry. Segun el modelo demografico, la regresion potencial muestra diferencias significativas (p Los resultados de la primera estructura de edad indican que los modelos 1 al 4 son factibles en el tiempo. El analisis de sensibilidad realizado muestra que simulando cosechas selectivas de arboles rectos de 10 hasta un 90 % (modelos 1 al 4) de las categorias 4, 5, 6 y 7 a partir del sexto ano, el rodal no seria afectado λ>1 y podrian ser los mas apropiados para una extraccion planificada llegando a ser sostenibles en el tiempo. La segunda estructura de edad resultaron ser extremadamente sensibles a cualquier cambio. Utilizar los modelos matriciales no es un camino sencillo de recorrer. Pese a los resultados, los modelos matriciales junto a la amplia experiencia del observador podrian plantear propuestas de manejo sostenible de los recursos forestales. EnglishTimber extractions non planned affect negatively in the reduction of forest cover, proper management and planned with minor extractions preserve the natural production allow for longer and sustainable forms a stand to benefit local populations and the same ecosystem. In the basin of Acero Marca has two stands Alnus acuminata that they are extracted continuously. With the purpose of planning the extraction of timber resourses were constructed and evaluated matrix models sustainable harvest of this species on the basis of structures of age. For this, two old structures we worked following a dendrochronological analysis and demographic model of the forestall mass, from making local information by transectos Gentry. According to the demographic model, the potential regression evidences significant differences (p The results demonstrate the first age structure suggest than models 1 to 4 are feasible in time. The sensitivity analysis shows that simulate selective harvests straight trees of 10 to 90% (models 1 to 4) of categories 4, 5, 6 and 7 from the sixth year, the stand would not be adversely affected λ> 1 and could be the most appropriate for a planned extraction becoming sustainable over time. The second structure of age proved extremely sensitive to any change. To use the matrix models is not a simple path of going over. In spite of the results, the matrix models joined to ample experience of the observer would be able to present proposals of sustainable handling of the forestal resources.

Modelos de aprovechamiento sostenible del Aliso (Alnus Acuminata Kunth) en zona de ladera de bosque de niebla