Title
Palaeofires in Amazon: Interplay between land use change and palaeoclimatic events
Date Issued
01 December 2014
Access level
open access
Resource Type
journal article
Author(s)
Cordeiro R.C.
Moreira L.S.
Rodrigues R.d.A.R.
Lamego Simões Filho F.F.
Martins G.S.
Santos A.B.
Barbosa M.
Guilles da Conceição M.C.
Rodrigues R.d.C.
Evangelista H.
Moreira-Turcq P.
Penido Y.P.
Seoane J.C.S.
Research Institute Development
Universidad Federal Fluminense
Publisher(s)
Elsevier
Abstract
Interpreting the geological record of Amazon biomass combustion requires comparing charcoal accumulation rates in various biomes at different time scales. Charcoal accumulation rates, a proxy for palaeofire records, were obtained in sediment cores from Amazon lakes surrounded by several vegetation types and from a reservoirs in an intense land use change region. The records presented in this study were obtained in the following areas i) a reservoirs in Alta Floresta region (northern Mato Grosso State); ii) Lago do Saci (southern Pará State), a lake close to Alta Floresta and located at the southern border of Pará State; iii) a bog in an ecotone area in the Humaitá region (southern Amazonas State); iv) lakes in lateritic iron crust of the Carajás Hills (southeastern Pará State); v) Lago Comprido, a floodplain lake close to the Amazon River and surrounded by tropical rain forest (Monte Alegre, Pará State; vi) Lagoa da Pata in the Morro dos Seis Lagos alkaline complex (São Gabriel da Cachoeira, Amazonas State) and vii) Lago Caracaranã, a secluded lake in the northern Amazon cerrado (Roraima State). The highest charcoal accumulation rates were observed for modern records related to an intense change in land use at Alta Floresta, which had no precedent during the Holocene history of the Amazon. High charcoal accumulation rates that were observed in the Carajás region during low lake level phases in the Amazon in the mid-Holocene were comparable to those at the onset of the human settlement in Alta Floresta region. An increase in charcoal accumulation rate was observed in the late Holocene when the lake level was high, suggesting an interaction between climates and human presence. Low charcoal accumulation rates are typical of modern high rainfall environments, as observed in Lagoa da Pata where the environment is not susceptible to occurrences of wildfires even during relatively drier climatic phases. Low charcoal accumulation rates also exist in the relatively dry cerrado (savanna type) biome even during relatively dry phases in the Caracaranã region where the savanna-type vegetation biomass is lower and thus generates less charcoal particles than forest ecosystems.
Start page
137
End page
151
Volume
415
Language
English
OCDE Knowledge area
Geociencias, Multidisciplinar Investigación climática
Scopus EID
2-s2.0-84910030545
Source
Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN of the container
00310182
Sponsor(s)
The authors acknowledge research support from the Conselho Nacional de Pesquisa (CNPq) process: 312829/2009-4 , 482837/2009-8 , Fundação de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ) process: E-26/111.625/2011 the cooperation programme CNPq-IRD (Institut de Recherche pour le Développemment) concerning to the projects “CLIMPAST”, process CNPq n°: 490735/2006-1 and “PRIMO”, the El Paso ANR project, the platform ANALYSES and UMS LMC14 for C14 AMS dating. Also thanks to the Vale Company to field work support and grants. Thoughtful comments from two anonymous reviewers helped improve this contribution.
Sources of information: Directorio de Producción Científica Scopus