MACROFOSSIL EVIDENCE DISPUTE UBIQUITOUS BIRCH-PINE- SPRUCE SUCCESSION IN WESTERN FINNISH LAPLAND

• Main Authors: Raimo Sutinen, Ilkka Aro, Hannu Herva, Tapio Muurinen, Matti Piekkari, Mauri Timonen
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Key words (GeoRef Thesaurus; AGI; paleobotany; Betula; Pinus; Picea; wood; mires; lakes; absolute age; 14C; Holocene; Lapland Province; Finland; Norway; Pousujärvi; Fennoscandia; Lapland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.600.2002; http://arkisto.gtk.fi/sp/sp46/sp46_pages_93_98.pdf

rain. Geological Survey of Finland, Special Paper 46, 93–98, 5 fi gures. Reconstruction of the post-glacial migration of Norway spruce (Picea abies (L.) Karst.) into northern Fennoscandia is based on pollen records and radiocarbon (14C) ages from organic deposits. However, no macrofossil evidence indicates the distribution of spruce beyond its present timberline-treeline ecotone. We ap-plied total sampling to study Holocene succession of tree species at two sites: Pousujärvi peat bog (68°51’N, 21°10’E), beyond the present tree limits of spruce and Scots pine (Pinus sylvestris L.) and at Lake Kompsiotievanlammit (68°30’N, 22°30’E) at the present pine treeline in western Finnish Lapland. Subfossil pine logs at the Pousujärvi site yielded 14C-ages from 5,000±40 to 5,110±60 yr BP (5,730 to 5,900 cal. BP). The pioneer species were found to be birch (Betula pubescens ssp.) yielding 14C-age