Characterization of organic matter as support to the study of the formation of surface horizon in soils under minimum cultivation of eucalyptus. / CaracterizaÃÃo da matÃria orgÃnica como subsÃdio ao estudo da formaÃÃo de horizonte superficial em solos sob cultivo mÃnimo de eucalipto.

AUTOR(ES)

Elen Alvarenga de Jesus

DATA DE PUBLICAÇÃO

2009

RESUMO

In Brazil, a substantial part of the forest plantations has been undertaken in areas in which the soil presents some degree of physical, chemical or biological degradation. The protection provided by tree canopy of forest plantations and soil cover, as a function of the deposition of litter, is one of the most important processes in the recovery of degraded areas, and as the organic matter controls much of the physical, chemical and biological soil properties, it is characterized as a key factor in the maintenance of forest ecosystems. In this context, this study aimed to characterize the organic matter as support to the hypothesis of the formation of surface horizon in soils under minimum cultivation of eucalyptus. The study was conducted in forest gardens planted with eucalyptus in Rio Grande do Sul. The samples were collected in three gardens with different historicals of use, at 0-5, 5-20 and 20-40 cm depths. At the 0-5 cm depth, the majority of Argisols (Ultisols) from the forest gardens presented OC contents higher than those from the native vegetation (referential), indicating the formation of a new A horizon due to the litter contribution. The Cambisols (Inceptisols) of CanafÃstula garden did not follow this trend because they present an humic horizon under native vegetation. These was an increment in C-HAF in depth in the major part of the garden soils, corroborating the field observations and measurements which pointed out for the occurrence of a buried A horizon. The field observations and measurements, the OC and chemical fractionation of organic matter (C-HAF) data evidenced the importance of the minimum cultivation in searching the forestry exploration sustainability.

ASSUNTO(S)

matÃria orgÃnica do solo recuperaÃÃo de Ãreas degradadas. eucalipto ciencia do solo horizonte superficial

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