Journal of Paleolimnology

, Volume 16, Issue 1, pp 67–78 | Cite as

Calibration of regional pollen data to construct maps of former forest types in southern Sweden

  • Gisela Björse
  • Richard H. W. Bradshaw
  • Daniel B. Michelson
Article

Abstract

A method was developed to construct maps of former forest types based on regional pollen data in southern Sweden. The considered species were Alnus, Betula, Carpinus, Corylus, Fagus, Fraxinus, Juniperus, Picea, Pinus, Populus, Quercus, Salix, Tilia and Ulmus. A network of 37 regional pollen sites with high data quality from lakes and peat deposits were selected from Sweden south of 60 ° N. Pollen percentage values were calculated and converted into estimates of tree composition. For controlling the reliability of the reconstruction, the estimates from the core-tops were compared with present day forest inventory data, and local pollen diagrams were compared with the regional pollen diagrams. An inverse distance weighted interpolation algorithm was used to generate maps for each tree species distribution at 2000 BP, 1500 BP, 1000 BP, 500 BP and 0 BP. A supervised classification routine was implemented to generate nine different forest types common to the five studied time intervals. The maps show that the amounts and patterns of distribution of the species and the forest types have varied in a significant but systematic manner through time. The changes are due to human activities, migrational patterns and changes in climate. These maps will be of value as a basis for future landscape planning, forestry and conservation of biodiversity.

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Gisela Björse
    • 1
  • Richard H. W. Bradshaw
    • 1
  • Daniel B. Michelson
    • 2
  1. 1.Southern Swedish Forest Research CentreSwedish University of Agricultural SciencesAlnarpSweden
  2. 2.Department of Landscape PlanningSwedish University of Agricultural SciencesAlnarpSweden

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