Resumo

ANRIQUEZ, Analía Liliana et al. Sistema Silvopastoril con diferentes coberturas arbóreas habilitado por rolado de baja intensidad: Impacto en glomalinas y fracciones de carbono del suelo. Cienc. suelo [online]. 2016, vol.34, n.1, pp.33-41. ISSN 1850-2067.

The aim of this study was to evaluate the effect of low intensity rolling on biological and biochemical indicators of soil quality in a silvopastoral system (SSP) planted with Panicum maximum var. Gatton panic (RBIs) subjected to controlled grazing, under tree covers (Ziziphus mistol (M); Aspidosperma quebracho blanco (Qb), Schinopsis lorentzii (Qc)) and a bare soil (D) in Santiago del Estero, Argentina. We measure total organic carbon (TOC), particulate organic carbon (POC), microbial biomass carbon (Cbm), POC:TOC and Cbm:TOC ratio, total glomalin (GT) and easily extractable glomalin (GFE) in bare soil, without any vegetation cover (D) and soil under M; Qb and Qc canopies. ANOVA and a principal component analysis (PCA) were performed in order to study the relationship between treatments, coverage and soil variables. The SSP planting Gatton panic (RBIs) did not modify the evaluated variables. In areas without coverage, it was registered a significant decline in all the evaluated variables and it was observed a significant increase of these variables under tree cover, especially under M treatment. The mean value of CBM:COT relationship was 2% showing that soil biota has a low metabolic efficiency, typical of semi-arid environments.

Palavras-chave : Microbial biomass; Chaco region; Tree cover.

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