globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.07.027
论文题名:
Holocene climate change in central-eastern Brazil reconstructed using pollen and geochemical records of Pau de Fruta mire (Serra do Espinhaço Meridional, Minas Gerais)
作者: Horák-Terra I.; Martínez Cortizas A.; da Luz C.F.P.; Rivas López P.; Silva A.C.; Vidal-Torrado P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 437
起始页码: 117
结束页码: 131
语种: 英语
英文关键词: Central-eastern Brazil ; Geochemistry ; Histosols ; Peatlands ; Pollen ; South America monsoon systems
英文摘要: Studies dealing with the reconstruction of Holocene climate change of tropical areas are scarce. Of these, multi-proxy investigations using peatlands are still absent. In this paper, we present the Holocene record of environmental changes in central-eastern Brazil reconstructed from a core sampled in Pau de Fruta mire (Serra do Espinhaço Meridional, Brazil). We combined palynological and geochemical analyses, supported by core stratigraphy, 14C dating and multivariate statistics. The location of the mire is ideal because it is in an area which is directly associated with the South Atlantic Convergence Zone (SACZ). Six main phases of change suggested by vegetation and local and regional landscape dynamics were described. In phase I (~10,000-7360cal. yr BP) the climate was very wet and cold and was accompanied by soil instability in the mire catchment (severe local erosion) and the 8.2ka event was easily recognizable by a large increase in the deposition of regional dust. Phase II (~7360-4200cal. yr BP) was characterized by wet and warm conditions, catchment soil stability and enhanced deposition of regional dust. In phase III (~4200-2200cal. yr BP), climate was dry and warm and soil erosion in the catchment increased again. In phase IV (~2200-1160cal. yr BP) dry and punctuated cooling was reconstructed, together with enhanced deposition of regional dust. Phase V (~1160-400cal. yr BP) reflects sub-humid climatic conditions (like the current climate), the lowest inputs of local and regional dust and the largest accumulation of peat in the mire. While in phase VI (< ~400cal. yr BP) sub-humid conditions continued but both local and regional erosion significantly increased. Our results demonstrate that the tropical peatlands of Serra do Espinhaço Meridional contain relevant records of Holocene climate changes, and that a multi-proxy approach offers good opportunities for a detailed reconstruction of palaeoenvironments. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68830
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作者单位: Departamento de Ciência do Solo, Escola Superior de Agricultura 'Luiz de Queiroz' - ESALQ/USP, Piracicaba, SP, Brazil; Departamento de Edafología y Química Agrícola, Universidad de Santiago de Compostela - USC, Santiago de Compostela, Spain; Núcleo de Pesquisa em Palinologia, Instituto de Botânica da Secretária do Meio Ambiente de São Paulo - IBt/SP, São Paulo, SP, Brazil; Departamento de Engenharia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM, Diamantina, MG, Brazil

Recommended Citation:
Horák-Terra I.,Martínez Cortizas A.,da Luz C.F.P.,et al. Holocene climate change in central-eastern Brazil reconstructed using pollen and geochemical records of Pau de Fruta mire (Serra do Espinhaço Meridional, Minas Gerais)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,437
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