EFFECTS OF SOCIAL AND PHYSICAL FACTORS ON NATIVE FOREST DEGRADATION

Efectos de factores físico-sociales sobre la degradación del bosque nativo


Gerardo Vergara y Jorge Gayoso

 

The environmental impact generated on the native forest of the Province of Valdivia by access roads and populations was analysed. In agreement with other studies, it was observed that the most significant impact on the forest occurred within a stripe of 3 kilometers each side from the road, becoming deforested from 22% up to 51% of the original surface. A model composes by physic and social factors explains the driving forces of the degradation. Some biophysic variables and high percentages of rural population explained most of the existence of interventions in the forest. Principal Component Analysis resulted an adequate technique in order to evaluate the importance of factors and their relationship with the spatial component.

Key words: Roads, multivariate techniques, deforestation, GIS, environmental impact.