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Soils and landforms at Hope Bay, Antarctic Peninsula: formation, classification, distribution, and relationships
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Orientador(es)
Resumo(s)
Antarctic soils occur in restricted areas, but few integrated studies on soils
and landforms have focused in the Antarctic Peninsula. We studied the representative
soils of Hope Bay, emphasizing the processes of quaternary
sedimentation, landforms, soil classification, and distribution. Results show
that landforms and soils are closely associated in Hope Bay. Ornithogenic
soils are associated with Late Pleistocene to Holocene stable ground
moraines; these are currently being destroyed by thermokarst erosion around
Lake Boekella. Lithic Haploturbels occur chiefly on shallow rocky terrains
whereas Typic Haploturbels are found on patterned ground. In Hope Bay,
a much colder climate prevails compared with the South Shetlands, and
the widespread permafrost close to the surface warrants strong cryoclastic
weathering with active and general gelifraction across different lithologies.
The shallow occurrence of permafrost in Hope Bay has a strong regulating
effect on soils, retarding leaching and soil development processes. Local soils
are, in general, shallow and cryoturbic, and the current pedoenvironment on
lowland stable areas was subjected to varying phosphatization on previously
weathered sedimentary material. The evidence of phosphatization of a formerly
larger area appears to be the main driver of pedogenesis at Hope Bay,
and nesting activity by penguins on stable surfaces is capable of enhancing
weathering and soil formation.
Descrição
Palavras-chave
Soils Landforms Hope Bay Antarctic Peninsula
Contexto Educativo
Citação
Reynaud Schaefer, C. E. G., T. T. Costa Pereira, J. C. Ker, I. C. Carreiro Almeida, F. N. Bello Simas, F. Soares de Oliveira, G. R. Corrêa, & G. Vieira. 2015. Soils and landforms at Hope Bay, Antarctic Peninsula: formation, classification, distribution, and relationships. Soil Sci. Soc. Am. J. 79(1), 175-184. https://doi.org/10.2136/sssaj2014.06.0266
Editora
Soil Science Society of America