SCIENCE@home

Relações material de origem solo e pedogênese em uma seqüência de solos predominantemente argilosos e latossôlicos sobre psamitos na Depressão Periférica Paulista

P. Vidal-Torrado,I. Lepsch

Published 1999 in Revista Brasileira De Ciencia Do Solo

ABSTRACT

A slope with a soil sequence over sandy Perm-Carboniferous sediments from the Itarare Formation with clayey oxidic soils was studied. This area is representative of the low hills with smooth relief of the low valley from the Piracicaba river. The area is located in the Piracicaba municipality about 22o 47'S & 47o 35'W within Sao Paulo State Peripheral Depression. The sequence comprises a clayey Dark-Red Latosol (Rhodudox), on the hill top transitioning downwards to a Dark-Red Latosolic-Podzolic Intergrade (Rhodic Kandiudox). At the upper backslope site there is an inclusion of a medium textured Red-Yellow Podzolic soil (Typic Hapludult). From general field observations plus the study of the local stratigraphy, macro and micromorphology and clay mineralogy of the six sampled pedons, it was concluded that the hypothetical soil material of the clayey soils is not all related to the underlying sediments. Evidences are for a strongly pre-weathered reworked parent material carried down from a clayey Neo-Cenozoic deposit whose similar remnants are under a nearby higher, almost flat, main interfluve surface. The oxic microaggregate characteristics of the backslope and footslope pedons were interpreted as inherited mostly from a similar parent material. On the lower upper third backslope there is a transition from an oxic like horizon to a kandic (argillic) one mainly due to clay lessivage over oxic microaggregates. This apparently produced coalescence of the older transported microaggregates. The hypothetical parent material of the Podzolic (Ultisol) median textured soil was interpreted as inherited from an old, now eroded, level of a river terrace alluvium from the Piracicaba river.

PUBLICATION RECORD

CITATION MAP

EXTRACTION MAP

CLAIMS

  • No claims are published for this paper.

CONCEPTS

  • No concepts are published for this paper.

REFERENCES

Showing 1-7 of 7 references · Page 1 of 1

CITED BY

Showing 1-24 of 24 citing papers · Page 1 of 1