SILVA, F. H. B. B.; http://lattes.cnpq.br/0134407731812128; SILVA, Flávio Hugo Barreto Batista da.
Résumé:
Detailed soil surveys have attached growing importance in recent years. In this
context, remote sensing products and techniques have been used successfully for a
number of researchers to speed up analysis and mapping processes.
The present study was based on 1984-TM/LANDSAT-5 imagery of the region of Alto
Rio Sucuru - Semi-arid Zone of the State of Paraíba. It reports a pedological analysis
of this area, presents geological, pedological and land use information and studies
their influence on the composition and the characteristics of the drainage pattens of
the soil units presented on the High-Intensity Reconnaissance Survey made of on a
scale of 1:100.000. An interpretation methodology of low spatial resolution data as
well as a ground work approach were both applied.
Using the method of the mapping unit, the composition and the characteristics of the
drainage pattern mapped from the TM/LANDSAT-5 imagery were studied. This
methodology was applied later on topographical maps elaborated by SUDENE and
compared to the method of circular samples. A 73 soil spots set, grouped into 16
mapping units, was identified. The study of the drainage pattern of these units
revealed a good unit differentiation results, e.g. between the units composed by
PODZÓLICOS VERMELHO AMARELO EUTRÓFICOS (Eutrophic Red Yellow
Podzolic) and REGOSSOLCS EUTRÓFiCOS (Eutrophic Regosois) and those
composed by BRUNOS NÃO CÁLCICOS (Non Calcic Brown Soils) and LITÓLSCOS
EUTRÓFICOS (Eutrophic Lithosols). Satisfactory results for the quantitative drainage
parameters, specially for the drainage density and river frequency, were remarked
from the drainage map
Although the efficiency of the method of circular samples on soil differentiation was
confirmed, the methodology proposed here presented more satisfactory results, by
allowing a better analysis of mapping units irregardless their morphology, structure
and shape.
