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History of Picea abies in west central Sweden

applications of pollen analysis to reveal past local presence of trees

Stedingk, Henrik von (2006). History of Picea abies in west central Sweden. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2006:92
ISBN 91-576-7141-9
[Doctoral thesis]

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Early Holocene Picea megafossils found in west central Sweden have challenged the prevailing theory based on pollen analysis that Picea migrated to Scandinavia during the second half of the Holocene. Pollen analyses is the most used method for the study of past vegetation dynamics; however, in the study of the postglacial immigration of Picea or for studies at the forest-tundra ecotone where the local pollen production is low, it is crucial to be able to separate locally produced tree pollen from pollen coming from distant forests. This thesis aims to explore methods to facilitate the separation of local pollen from background pollen and thereby enable the inference of the local establishment of Picea abies at a site, to evaluate whether the Picea megafossils can be confirmed by pollen analysis, and to investigate the pollen-vegetation relationship at the forest-tundra ecotone. Pollen analysis was carried out from mires situated near early to mid Holocene Picea megafossil sites in west central Sweden. The relationship between pollen from moss polsters and the surrounding vegetation was analysed with models for pollen dispersal and deposition. In a simulation study a landscape model for Holocene tree-line fluctuations based on palaeoecological data representing different time slices was evaluated by the comparison of numerous simulated pollen counts from different elevations with actual pollen diagrams. The results show that it is possible to confirm the megafossils with pollen analyses, provided that the pollen sampling site is within tens of meters from the megafossil site. The timing of local Picea establishment and expansion differed between nearby sites. Parameters to facilitate the understanding of pollen-vegetation relationships at the forest-tundra ecotone were established: pollen productivity estimates (PPE), relevant source area of pollen (RSAP), and background and local pollen. The PPE at the forest-tundra ecotone differed from estimates in southern Sweden, showing varied responses to climate on pollen production for assorted taxa. It was concluded that the use of multiple adjacent sites for pollen analyses, calibration of modern pollen and current vegetation, and the simulation approach are applications that facilitate the interpretation of pollen analysis in terms of local presence of trees.

Authors/Creators:Stedingk, Henrik von
Title:History of Picea abies in west central Sweden
Subtitle:applications of pollen analysis to reveal past local presence of trees
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :October 2006
Number of Pages:32
ALLI. Segerström U. & von Stedingk, H. 2003. Early Holocene Picea abies (L.) Karst., in west central Sweden as revealed by pollen analysis. Holocene 13, 897-906. II. von Stedingk, H., Ek, L.-G., Hörnberg, G. & Segerström, U. Post-glacial establishment of Picea abies (L.) Karst. in the central Scandes. Manuscript. III. von Stedingk, H., Fyfe, R.M. & Allard, A. Pollen productivity estimates for the reconstruction of past vegetation at the forest-tundra ecotone. Submitted manuscript. IV. von Stedingk, H. & Fyfe R.M. The use of pollen analysis to reveal Holocene tree-line dynamics – a modelling approach. Submitted manuscript.
Place of Publication:Umeå
ISBN for printed version:91-576-7141-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:picea abies, plant establishment, pollen, tundra, ecotones, simulation models, palynology, palaeontology, ecological succession, forest trees, history, sweden
Keywords:Norway spruce, tree migration, Scandinavia, forest-tundra ecotone, moss polster, background pollen loading, long distance transport, pollen productivity estimates, simulation approach, ERV-model, megafossil, tree-line
Permanent URL:
ID Code:1223
Department:(S) > Institutionen för skoglig vegetationsekologi (930701-061231)
Deposited By: Henrik von Stedingk
Deposited On:04 Oct 2006 00:00
Metadata Last Modified:02 Dec 2014 10:10

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