Age, origin, and palaeo-ecological evidence of blanket bogs in Nord-Trøndelag, Norway |
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| Authors: | ULF HAFSTEN THYRA SOLEM |
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| Institution: | University Dept. of Botany, NLHT, N-7000 Trondheim;Thyra Solem, Thyholtveien 32, N-7000 Trondheim |
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| Abstract: | Pollen diagrams, 14C-datings, and peat stratigraphy are presented from 3 sites in the Forradal sub-oceanic area in Nord-Trøndelag, a moorland complex of flat and sloping fens and blanket bogs lying 400–500 m above sea-level, ca. 40 km E of the Trondheimsfjord. The vegetational and climatic history during the last 8500 years is described, together with a survey of present-day conditions. The origin of the blanket-bog areas is shown to agree generally, in both time and mode of genesis, with similar bog types in Scotland and N England. Dates are given for the expansion of both alder and spruce, the latter occurring more than 1000 years later than in SE Norway. The possible role of provenance formation and Roman Iron Age amelioration of the climate is discussed in this connection. The course of the alder pollen curve indicates a drier and probably colder type of climate at ca. 3000–2400 B.C. |
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