"Reconstrução paleoambiental (vegetação e clima) no Quaternário tardio com base em estudo multi/interdisciplinar no Vale do Ribeira (sul do Estado de São Paulo)" / Palaeoenvironmental reconstruction (vegetation and climate) in the late Quaternary with multi/interdisciplinary studies in the Vale do Ribeira (south of São Paulo state)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The study sites are in the PETAR - Parque Estadual Turístico do Alto Ribeira and PEI - Parque Estadual Intervales, in the southeastern region of Brazil. The area is characterized by the presence of the native vegetation of Atlantic forest and two natural lakes called LAgoa Grande and Lagoa Vermelha, where three sediment cores were collected. Chemical (C, N and mineralogy), isotope (12C, 13C and 14C), and biological (pollen analyses) tools were used in the study to understand the palaeovegetation history of the region during the late Pleistocene and Holocene and its relation to climate changes. Soils samples were collected from trenches and by drilling at five locations under natural forest vegetation in the PETAR and PEI study sites.The isotope data (δ13C)collected in soil at two locations in the PETAR area showed much more enriched δ13C values ( -17,1%0 and -20,1%0)in the deeper horizons, indicating the presence of a less dense vegetation than the present modern day, with a probable mixture of C3 and C4 plants, in the period of ~30.000 to ~16.000 years BP. This pattern suggested the presence of a drier climate. From ~16.000 years BP to the present, a significant isotopic depletion (up to -28,3 %0)was observed in all sites indicating an expansion of the forest, probable associated to the presence of a more humid climate than the previous period. The isotope results (δ13C) collected at the PEI soils indicated the presence of forest vegetation since ~14.000 years BP, except in one location (SAI), where more enriched δ13C values (-21,8 %0) were observed probable related to mixture of C3 e C4 plants, and/or a presence of a less dense forest vegetation around ~14.000 years BP. From the results of the sediment organic matter compositions of LAgoa Grande, it was verified that the environmental conditions were relatively stable during the last 1000 years, characterized by the presence of C3 plants and phytoplankton, suggesting humid climaticconditions and the lake probable wasn t dry during the last millennium. Environmental conditions for the Lagoa Vermelha were also relatively stable during the last 4500 years, characterized by the significant presence of C3 plants in the sediment organic matter indicating humid climatic conditions. The changes in vegetation composition recorded by palynology during the period of ~1400 to 1100 years BP can be related to existence of a probable colder climate than today.

ASSUNTO(S)

stable isotopes (c and n) carbon-14 palaeoenvironment isótopos estáveis (c e n) sediment organic matter soil organic matter matéria orgânica do solo paleoambiente matéria orgânica sedimentar carbono-14

ACESSO AO ARTIGO

Documentos Relacionados