Resumo

SILBERMAN, JUAN EDUARDO et al. LA COBERTURA ARBÓREA EN UN SISTEMA SILVOPASTORIL DEL CHACO Y SU CONTRIBUCIÓN DIFERENCIAL AL SUELO. Cienc. suelo [online]. 2015, vol.33, n.1. ISSN 1850-2067.

In the Chaco region, the technology called low intensity roller chopping (RBI) and planting of Panicum maximum allows control of woody species and increase forage production. It is unclear the effects of these practices on soil features. The objective of this work was to evaluate the impact of the conversion of native forest to silvpastoral systems on soil carbon fractions, soil nitrogen, and soil respiration. Treatments were native forest considered as control (T); (RBI) silvopastoral system with low intensity roller chopping and planting of Panicum maximum cv gatton panic. Cover factors were (D) soil without tree cover (Qb) soil under the cover of Aspidosperma quebracho blanco and (M) soil under cover of Ziziphus mistol. RBI maintained carbon stocks of soil and native tree cover was important in preserving soil organic matter and microbial activity. Soil carbon, soil nitrogen and soil microbial activity was a function of tree cover and levels COS, COP, NT and RE were lower in soil without tree cover, intermediate under cover of Aspidosperma quebracho blanco and higher under the canopy of Ziziphus mistol because of the increased supply of litter by the later specie. The combined effect of a large input of organic litter and minimal disturbance determined best conditions for the functionality of heterotrophic microorganisms, with positive effects on C storage in the topsoil. Thus, it is shown that rolling and planting of Panicum maximum cv Gatton panic did not affect the quality of a soil in the Chaco region.

Palavras-chave : nitrogen.

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