Influencia de um sistema Silvipastoril estabelecido no bioma serrado sobre a ciclagem de nutrientes, atributos do solo, da forrageira e do armazenamento de carbono

Abstract

Inadequate politics and technologies have contributed to the economic, social and environmental unsustainability of the agriculture and livestock production in Brazil. The aim of this study was to evaluate one silvopastoral systems (SPS) and also the positive effects which could be used for a sustainable animal production. The influence of a SPS on nutrient cycling, physical and chemical soil attributes, forage production and carbon sink was evaluated. The SPS was established in the Cerrado biome, through natural regeneration of the tree (Zeyheria tuberculosa Vell. Bur) and the grass forage (Brachiaria brizantha cv. Marandu) (BBM). The tree specie, at this density, increased the values of pH, calcium (Ca+2), magnesium (Mg+2) and bases saturation (V) reduced aluminum (Al+3) at 0-2 cm soil layer. The macronutrients concentration was not affected and could be influenced by the high relationship between carbon/nitrogen (C/N) and lignin/N on the trees litter. The physical attributes were slight influenced and both systems and were efficient at keeping the soil structure. The dry matter production of BBM were not affected by the presence of trees, during typical period of hydric stress. On the other hand, the mineral composition was influenced by the presence of trees. However, the crude protein concentration on BBM increased on the SSP. The SPS demonstrated the potential to increase carbon reservoir in relation to pastures cultivated as monoculture.