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Physical and chemichal quality in soils in forest exploitation areas in Mato Grosso

The objective of this work was to evaluate the impact in soils under wood storage clearings as well as the influence of clearing shape on the degradation process in these sites. Thus, it was selected five wood storage clearing areas in a logging exploitation area, where the predominant type of soil is Red-Yellow Latosol, in Nova Maringa-MT. Four squared clearing storage areas a rectangular one were selected. In each clearing, three transects that were within the native forest were established, and a sample collection of soil at 0-20 cm layer was made in five points in each transect. These samples were used for determination of texture, water-dispersible clay, moisture in field capacity, aggregate distribution and stability, chemical analyses, total carbon, total nitrogen and mineralizable carbon. For soil and particle density measurements, samples were taken from 0-5 cm and 15-20 cm layers in the central transect. Results were submitted to statistical tests (Tukey test, P<0.05). Penetration resistance tests at five different points in each clearings, and three points in the neighbor forest were carried out in the dry and wet season. The results indicate a strong degradation of soils under wood-storage clearings with a significant increase in soil density and penetration resistance as well as a reduction in total porosity, in the aggregate diameters and in the nutrient levels. The use of wood-storage clearings with different shapes did not decrease the environment impacts.

Environment impacts; Soil physics; Wood-storage clearings


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