RELAÇÕES CLIMÁTICAS COM O CRESCIMENTO DE Araucaria angustifolia E ATRIBUTOS FÍSICOS DO SOLO SOB SISTEMA SILVIPASTORIL E FLORESTA SECUNDÁRIA

Abstract

The Araucaria Forest is characteristic in the Atlantic Forest, found especially in the south of Brazil, largely in the state of Paraná. Silvipastoril system is a form of agroforestry system that has stood out in the search for more sustainable systems, this is possible to combine production and environmental conservation to soil conditions as close to natural, to seek a balance of the ecosystem managed from the diversity of species and maintain the microclimate. This study looked at the influence of an implanted under natural remaining silvopastoral system compared to a forest area in the secondary stage of regeneration, which is isolated from the silvopastoral management for over 20 years with regard to the physical quality variables soil and diameter growth of A. angustifolia. We evaluated the main indicators of soil physical quality as well as measurements of Araucaria growth rings in individuals of different sizes, using a technique called dendrochronology, which allowed the generation of 23-year timelines in both places, which were correlated with the variables average and accumulated precipitation temperature. It was found that the isolation of the secondary forest area may have been able, 20 years, changing the distribution of pores in the soil, however, can be considered the natural system silvipastoral considered as being capable of maintaining the environmental sustainability place when compared to a preserved area, so that the soil was stable characteristics derived from its commercial exploitation. In Araucaria growth assessment, the variable precipitation showed higher effect on growth in diameter of the two sites in the average temperature, the management of the area with silvopastoral system does not alter the average growth in diameter, however, there were differences in the chronologies between the two areas, reiterating the need for knowledge of area history in carrying out this type of analysis for purposes of production and conservation.