ACCESSIBILITY INDEX TO DETERMINE FOREST ECOSYSTEMS DEGRADATION HAZARD

Desarrollo de un Índice Sintético de Accesibilidad para Determinar Susceptibilidad a la Degradación en Ecosistemas Forestales


Gerardo Vergara Asenjo

 

Despite increasing intervention pressure on the forest, the necessity of relying on techniques and indicators that allow to evaluate and understand better the complex phenomena that affects natural resources was carried out as a form of contributing to the sustainable management. The impact generated on the native forest of the Province of Valdivia by secondary and primary access roads is analyzed. In agreement with other studies, it is appreciated that the most significant impact on the forest is produced within 3 kilometers from the border of the road, becoming intervened up 22% of the original surface. A synthetic index is developed through a model of regression logistics that esteems the more vulnerable to the intervention evaluated from a historic view point. The slope of the land, the altitude above sea level, the distance from the roads, the soil type and the percentage of people that live in rural zones are the variables that better explain the existence of interventions in the forest. The analysis of the geographical zones and the variables in studied was carried out through an Analysis for Principal Components, being an adequate technique in order to evaluate the importance of the variables and their relationship with the spatial component.

 


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