Alteração física e morfológica em solos cultivados sob sistema tradicional de manejo
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Data
2005
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Resumo
Some of the pedologic alterations resulting from traditional soil management methods
were studied in an area cultivated with citrus (Citrus sinensis) in a farm in Bariri County,
State of São Paulo, Brazil. A toposequence was established to evaluate the effect of the
position in the landscape on changes in soil physical attributes. Field and lab data were
taken in vertical profiles of the upper, middle and lower slope levels of a Typic Haplorthox
and some parameters were evaluated statistically through mean comparison tests. Results
evidenced that the soil bulk density and macroporosity changed along the toposequence,
especially at the lower levels of the slope. In such positions, where the clay level is higher,
empty spaces were filled, forming blocky structures, which occurred concomitantly with
micro-aggregate structure. Intensive cultivation caused the greatest soil structure alterations,
even at the deeper soil layer. The study reinforces the importance of detailed morphological
observations in vertical profiles due to the great variation of pedological attributes within a
short distance. In a single profile, compact sectors were observed side by side with
disaggregated pockets. This shows that vertical gradients (in each profile) as well as lateral
ones (along a toposequence) have to be taken into account when studying temporal variations
of pedological parameters.
Descrição
Palavras-chave
Traditional soil management, Manejo tradicional do solo, Topographic sequence, Soil micromorphology, Soil aggregates, Seqüência topográfica, Micromorfologia do solo, Agregados do solo
Citação
SOARES, Jorge Luís Nascimento; ESPÍNDOLA, Carlos Roberto; CASTRO, Selma Simões de. Alteração física e morfológica em solos cultivados sob sistema tradicional de manejo. Revista Brasileira de Ciência do Solo, Viçosa, v. 29, p. 1005-1014, 2005.