DOI: 10.1016/j.palaeo.2012.07.010
论文题名: Vegetation responses to rapid warming and to minor climatic fluctuations during the late-glacial interstadial (GI-1) at gerzensee (switzerland)
作者: Ammann B. ; van Leeuwen J.F.N. ; van der Knaap W.O. ; Lischke H. ; Heiri O. ; Tinner W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 391 起始页码: 40
结束页码: 59
语种: 英语
英文关键词: Afforestation
; Allerød
; Bølling
; Biotic responses to climatic change
; Late-Glacial
; Oldest Dryas
; Plant-population dynamics
; Pollen
; Primary succession
; Vegetation
英文摘要: High-resolution pollen analyses made on the same samples on which the ratios of oxygen isotopes were measured that provided the time scale and a temperature proxy after correlation to NorthGRIP.(1)A primary succession: The vegetation responded to the rapid rise of temperatures around 14,685yr BP, with a primary succession on a decadal to centennial time scale. The succession between ca 15,600 and 13,000yr BP included:(1.1.)The replacement of shrub-tundra by woodland of Juniperus and tree birch (around 14,665yr BP)(1.2.)The response of Juniperus pollen to the shift in oxygen isotopes in less than 20yr,(1.3.)A sequence of population increases of Hippophaë rhamnoides (ca 14,600yr BP), Salix spp. (ca 14,600yr BP), Betula trees (ca.14,480yr BP), Populus cf. tremula (ca. 14,300yr BP), and Pinus cf. sylvestris (ca. 13,830yr BP).(2)Biological processes: Plants responded to the rapid increase of summer temperatures on all organisational levels:(2.1)Individuals may have produced more pollen (e.g. Juniperus);(2.2)Populations increased or decreased (e.g. Juniperus, Betula, later Pinus), and(2.3)Populations changed their biogeographical range and may show migrational lags.(2.4)Plant communities changed in their composition because the species pools changed through immigration and (local) extinction. Some plant communities may have been without modern analogue.These mechanisms require increasing amounts of time.(2.5)Processes on the level of ecosystems, with species interactions, may involve various time scales. Besides competition and facilitation, nitrogen fixation is discussed.(3)The minor fluctuations of temperature during the Late-Glacial Interstadial, which are recorded in δ18O, resulted in only very minor changes in pollen during the Aegelsee Oscillation (Older Dryas biozone, GI-1d) and the Gerzensee Oscillation (GI-1b).(4)Biodiversity: The afforestation at the onset of Bølling coincided with a gradual increase of taxonomic diversity up to the time of the major Pinus expansion. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69573
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH 3013 Bern, Switzerland; Swiss Federal Research Institute WSL, Zürcherstr. 111, CH-8903 Birmensdorf, Switzerland
Recommended Citation:
Ammann B.,van Leeuwen J.F.N.,van der Knaap W.O.,et al. Vegetation responses to rapid warming and to minor climatic fluctuations during the late-glacial interstadial (GI-1) at gerzensee (switzerland)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,391