Description:
The paper gives a survey of the regional features in the present mire vegetation of Finland with special emphasis upon the regions of raised bogs. The means of making a distinction between minerotrophic and ombrotrophic vegetation, both at the present time and in the past is discussed. The studies dealing with the history of raised bogs in Finland are reviewed. It is evident that the Sub-Boreal period was the main phase for the origin of ombrogenous peat formation. The Sub-Atlantic period has been secondary in importance. In some cases raised bogs began to form during the Atlantic time already.The surface pattern which is especially characteristic for the so-called kermi raised bogs is evidently of a fairly recent origin. It has been formed mainly during the Sub-Atlantic period. Both the wet depressions and the interlying high dry strings have been remarkably stabile formations.
L'étude des tourbières bombées de Finlande révèle que la majeure partie d'entre elles se sont développées à partir du Subboréal. Cependant dans certains cas la tourbification a débuté des l'Atlantique.