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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Relation between carbon isotopes of plants and soils on Marajo Island, a large tropical island: Implications for interpretation of modern and past vegetation dynamics in the Amazon region

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Autor(es):
Francisquini, M. I. [1] ; Lima, C. M. [1] ; Pessenda, L. C. R. [1] ; Rossetti, D. F. [2] ; Franca, M. C. [3] ; Cohen, M. C. L. [4]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Lab 14C, BR-13416000 Piracicaba, SP - Brazil
[2] Inst Nacl Pesquisas Espaciais, BR-12245970 Sao Jose Dos Campos, SP - Brazil
[3] Fed Inst Para, BR-66090000 Belem, Para - Brazil
[4] Fed Inst Para, BR-66077530 Belem, Para - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY; v. 415, n. SI, p. 91-104, DEC 1 2014.
Citações Web of Science: 5
Resumo

We assess the relation between the contrasting vegetation types of rainforest, open savanna and wooded savanna coexisting in close contact on Marajo Island at the mouth of the Amazon River. Floristic and carbon isotopic characterizations of modern plants were combined with organic matter carbon isotope and grain size records of soil to characterize vegetation evolution at six locations on southeastern and northeastern Marajo Island and its relations to climate changes since the late Pleistocene. C-3 plants contribute 100% of the biomass in the rainforest on post-Barreiras sediments (site 1). No significant vegetation changes are evident in these places since at least similar to 7860 cal yr B.P. Rainforests on paleochannels (sites 4 and 6) are protected from flooding by slightly elevated sandy levee and have flora very similar to site 1. These forests were formed since the early-mid Holocene after channel abandonment C3 grasses are predominant in open savanna areas (sites 4,5 and 6), with less representation in wooded savannas (sites 2 and 3). However, C-4 grasses, despite having fewer species, constitute significant biomass in the wooded (similar to 60%) and open savanna vegetation areas, especially during the dry season. The reconstructions of past vegetation together with the distributions of modern vegetation allow prediction that climate changes to drier conditions can significantly influence the future Marajo Island landscape, likely enabling expansion of C-4 plants in the flooding zone and of trees in the rainforests. (C) 2014 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 04/15518-6 - Integração de dados biológicos e geológicos no Baixo Tocantins-Ilha do Marajó: chave na análise da biodiversidade
Beneficiário:Dilce de Fátima Rossetti
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 06/52173-2 - Dinâmica de vegetação e inferências climáticas no Quaternário Tardio na região da Ilha de Marajó, (PA), empregando os isótopos de carbono (12C, 13C, 14C) da matéria orgânica de solos e sedimentos
Beneficiário:Claudia Moré de Lima
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 07/03615-5 - Reconstrução da vegetação e clima desde o Holoceno médio no Brasil
Beneficiário:Luiz Carlos Ruiz Pessenda
Linha de fomento: Auxílio à Pesquisa - Regular