globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.06.027
论文题名:
Reconstruction of late Holocene forest dynamics in northern Ecuador from biomarkers and pollen in soil cores
作者: Jansen B.; de Boer E.J.; Cleef A.M.; Hooghiemstra H.; Moscol-Olivera M.; Tonneijck F.H.; Verstraten J.M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 386
起始页码: 607
结束页码: 619
语种: 英语
英文关键词: Biomarkers ; Ecuador ; Migrational lag between proxies ; Pollen ; Soils ; Upper forest line ; VERHIB
英文摘要: Centuries of human interference have led to large scale reduction of montane forests in the northern Ecuadorian Andes. As a result the natural position of the upper forest line (UFL) in the area is now subject of scientific debate, which is hindering sustainable reforestation efforts. Uncertainty is fuelled by insufficient precision of fossil pollen spectra to reconstruct the natural UFL position. Here we tried to resolve this issue by using biomarkers, i.e. plant species specific patterns of n-alkanes and n-alcohols, preserved in soils in the northern Ecuadorian Andes as additional proxy to reconstruct the natural UFL position. To unravel preserved biomarker patterns we used the recently developed VERHIB model, and for the first time assessed its applicability in soil archives. Changes in Holocene biomarker-based vegetation composition were directly compared to changes in pollen-based vegetation composition from the same soil profiles. Both proxies proved to be complementary and a combined application allowed for a more accurate reconstruction of past vegetation than with pollen analysis alone. We found that the present-day UFL in the study area has not been significantly depressed by human interference and was at 3650. m maximally during late Holocene times. For the moment of post-glacial forest development we found a migration lag between pollen (earlier) and biomarkers (later). This reflects the difference between the non-transported biomarker signal showing spot-dating (thus in paleoecological studies functionally equalling the information from plant macro-remains in peat bogs), and the upslope wind-blown pollen signal showing an upslope forest expansion up to over a millennium ahead. The combined pollen-biomarker approach in soil cores shows great potential for vegetation reconstruction. However, more research of biomarker consistency and preservation is needed before application in other environments. © 2013 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/69675
Appears in Collections:过去全球变化的重建

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作者单位: Institute for Biodiversity and Ecosystem Dynamics-Earth Surface Sciences (IBED-ESS), University of Amsterdam, 1090 GE, Amsterdam, Netherlands; Institute for Biodiversity and Ecosystem Dynamics-Paleoecology and Landscape Ecology (IBED-P and L), University of Amsterdam, 1090 GE, Amsterdam, Netherlands

Recommended Citation:
Jansen B.,de Boer E.J.,Cleef A.M.,et al. Reconstruction of late Holocene forest dynamics in northern Ecuador from biomarkers and pollen in soil cores[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,386
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