ENVIRONMENTAL DISTURBANCES ASSESSMENT BY
SEMI-MECHANIZED HARVESTING IN EVERGREEN FORESTS

Evaluación de las Alteraciones Producidas al Medio, por una Cosecha Semi-mecanizada en el Tipo Forestal Siempreverde


Jorge Contreras Garcia

 

Damages due to harvesting activities in the residual forest and the effects on soil are evaluated.

Antecedents comes from 37 ha evergreen forest stand with protective cutting, maintaining the floristic diversity and leaving an homogeneous cover which permits the enrichment with nursery native tree species, in order to permit the forest recovering. The evaluation has been made after the first extractive period, where the more productive trees were felled.

Residual forest stocks are analyzed, considering diversity, diametric distribution, damage intensity by harvesting operations and trees quality. Posteriorly a secondary cut option is simulated, and different alterations intensities to the soil by skid roads, yard, and road construction are evaluated. Finally the altered surface, removed soil volumes, altered surface-harvest surface relation, apparent density variation and shear strength are obtained.

This harvest method is a good option for the evergreen forest and guarantee its sustainability but a more flexibility in the homogeneous cover and alternative strip plantations are recommended changing to clear cutting in small areas and later enrichment. Some advises for diminishing the soil alterations are included.

 


* Tésis disponible en la Biblioteca de la Universidad Austral de chile