| Autor: |
R. G. Cresswell, Roberto Meigikos dos Anjos, Bruno Turcq, L.K. Fifield, P. R. S. Gomes, M. di Tada, A. Sifeddine, Renato Campello Cordeiro, Guaciara M. Santos |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 172:761-766 |
| ISSN: |
0168-583X |
| DOI: |
10.1016/s0168-583x(00)00234-2 |
| Popis: |
Soil samples were collected in tierra firme upland and lowland areas of the Km 41 reserve near Manaus (20°30′S and 60°W), in Central Brazilian Amazon, within a 1700 m transect, at eight different depth ranges, from surface to 100 cm. The highest charcoal concentrations were found at the depth range of 20–50 cm. AMS radiocarbon dating of 31 samples were performed at the ANU. The ages of the charcoals were found to vary within the 130 to 2400 years BP range, mostly between 1200 and 1400 years BP, one of the known Holocene dry periods of the Amazon region. The results show that the fires have regional dimensions and are associated with climate regional changes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect