Last millennium environmental changes and climate inferences in the Southeastern Atlantic forest, Brazil

Anais da Academia Brasileira de Ciências

Luiz C.r. Pessenda²  Soraya E.m.g. Saia²  Susy E.m. Gouveia²  Marie-pierre Ledru¹  Abdelfettah Sifeddine¹  Paula G.c. Amaral¹  José A. Bendassolli¹ 

[1] ,USP CENA Laboratório de CarbonoPiracicaba SP ,Brasil

关键词: lacustrine sediment;    C and N isotopes;    pollen;    Atlantic Forest;    last millennium;    Little Ice Age;    sedimento lacustre;    isótopos do CeN;    pólen;    floresta Atlântica;    último milênio;    Pequena Idade do Gelo;   

DOI  :  10.1590/S0001-37652010000300019

来源: SciELO

【 摘 要 】

This study presents paleoenvironmental data based on pollen, elemental and isotopic compositions of organic matter (TOC, N, d13C and d15N) and 14C dating of 170 cm lake sediment record. Samplings have been made in Lagoa Grande at Parque Estadual Turístico do Alto Ribeira - PETAR, Southern São Paulo State, Southeastern Brazil. The variations in relative frequencies (in percentage) of arboreal pollen along the core range between 40 and 80%. The d13C values ranged from -23‰ to -30‰ and C/N of ~10 to 15, indicating the contribution of terrestrial C3 plants and algae in the sediment organic matter. The d15N results presented values from 3 to 4.5‰, also suggesting a mixture of algae and terrestrial C3 plants. The 14C dating indicates modern age for the shallow horizons to ~1030 BP at the base of the core. A probable wetter climate in the period of ~370 BP to ~340 BP was inferred from the data set, which corresponds to a part of the period covered by the Little Ice Age (LIA).

【 授权许可】

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