Field test were carried out with the objective of evaluating the wood harvest and extraction traffic effects on soil physical properties on a commercial poplar plantation (Populus sp.). Two situations were evaluated: a) non-transited zones and b) transited zones by the harvest machinery. Penetration resistance, bulk density and gravimetric moisture were determined on non-transited zones and in the vehicles tracks. Penetration resistance values measured in the vehicles tracks were significantly higher than non transited zones up to 150 mm depth, and transit effect was detectable up to 380 mm depth. From 150 mm, both treatments overcame 1.5 MPa values, which would produce root growth reductions. Mean bulk density on transited zones was significantly higher than non-transited zones. Depth analyses values were significantly lower in the first 80 mm than the lower stratas in each treatment. High bulk density layer had an influence in shallow soil compaction.
traffic; bulk density; penetration resistance
