EVALUACIÓN DEL IMPACTO EN EL SUELO DE UN EQUIPO DE MADEREO EN UN RODAL DE Pinus radiata D. Don


Paola Gayoso Morelli

 

Abstract

The main objective of this study was to evaluate soil disturbances generated during ground-based logging using a track skidder, in a final harvest of a 25 year-old Pinus radiata stand. The study area of 13.42 hectares is located in the Tenth Region of Chile, on clayed loam soils and harvesting occurred during the spring of 2002.

Results showed that trails and landings under the planned condition occupied the 32.5% of total surface. In contrast, in the un-planned sector, the 50% of the surface showed some level of damage. For the condition of main skidroads under planned logging condition, the soil bulk density came to be the double of the unaffected situation and a 38% higher than in the case of secondary skidroads.

Also, a complementary objective was carried on. Through the evaluation of historic and reliable new information, soil recovery capacity on skid trails abandoned 20 years ago was analyzed. The soil under skid trails showed severe compaction up to 40 cm depth twenty years ago, and the new outputs show a recovery of the bulk density in the first 20 cm, while soil compaction persists at deeper layers.

As conclusions of the study, it is possible to mention that planned skid trails generate an environmental benefit, because a lower percentage of the soils are affected by logging operations. Also, that soil compaction tend to recover with time specially at the superficial layer although high bulk densities are still found below 20 cm deep at skid trails abandoned 20 years ago which might negatively affect site productivity.

Keywords: soil compaction, ground-based logging, soil recovery.