KEYS FOR EVALUATING SITE SENSITIVITY TO SOIL DEGRADING PROCESSES BY LOGGING

Claves para Estimar el Nivel De Fragilidad de los Suelos a la Degradación por Cosecha Forestal


Jorge Gayoso y Roberto Muñoz

 

This study proposes easy application guidelines for evaluating site sensitivity to soil degrading processes by logging; includes soil compactation and puddling, soil displacement, surface soil erosion and landslide hazards. Single comprehensible parameters and common to forest inventories were used. The methodology consists in a ranking system that allow the soil hazard classification in five significance levels to each and one global degrading processes: very low, low, moderate, high and very high. Data field standardization into a value ordinal scale, between 0 to 10, are requiered. Then, through a logarithmic function and the use of nomograms, the significance hazard levels are computed. Each hazard level is associated to global site conditions and best management forest practices. This methodology has been applied using both direct field data as from Geographic Information System databases. In spite of the fact that over 50000 hectares have been ranqued by this way, its considers that more validation is necessary for a greater site amplitude.

Key words: site sensitvity, environmental assessment, forest harvesting.