DOI: 10.1016/j.palaeo.2015.03.015
论文题名: Mid- and late Holocene fluvial dynamics in the tropical Guapi-Macacu catchment, Southeast Brazil: The role of climate change and human impact
作者: Kirchner A. ; Nehren U. ; Behling H. ; Heinrich J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 426 起始页码: 308
结束页码: 318
语种: 英语
英文关键词: Fluvial dynamics
; Internal and external forcing
; Landscape evolution Holocene
; Palaeoclimatic fluctuations
; Southeast Brazil
英文摘要: Deeply incised middle to late Holocene fluvial sediments of several streams in the tropical Guapi-Macacu River catchment in the state of Rio de Janeiro were investigated with stratigraphical, sedimentological and geochronological methods. These investigations revealed multiple changes of the fluvial dynamics during the Holocene, triggered by a millennial climate change and the post-colonial increase of land use. Reduced fluvial dynamics and geomorphic stability prevailed in this region during the relatively dry mid-Holocene from 6.6 until 4.7. cal. ka. BP. This phase of stability was followed by a period of geomorphic activity as indicated by increased fluvial dynamics from this date. This overall environmental change corresponds well with the onset of quasi-modern humid climate conditions in southeastern Brazil during the mid- to late Holocene transition. A new period of activity has taken place since 0.29. cal. ka. BP, in relation with the start of European colonization and increased land use pressure. Large areas of Atlantic Forests were converted into agricultural and pasture land, causing strong soil erosion and destabilized slopes. The results of these investigations improve the existing Holocene landscape evolution model and highlight that under the given specific climatic and environmental conditions, even a closed forest cover does not necessarily result in geomorphic stability. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68951
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geography, University of Leipzig, Johannisallee 19a, Leipzig, Germany; Institute for Technology and Resources Management in the Tropics and Subtropics, Cologne University of Applied Sciences, Betzdorfer Str., 2, Köln, Germany; Department of Palynology and Climate Dynamics, Albrecht-von-Haller Institute for Plant Sciences, Georg-August-University of Göttingen, Untere Karspüle 2, Göttingen, Germany
Recommended Citation:
Kirchner A.,Nehren U.,Behling H.,et al. Mid- and late Holocene fluvial dynamics in the tropical Guapi-Macacu catchment, Southeast Brazil: The role of climate change and human impact[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,426