Abstract

Hafsten, U. 1987. Vegetasjon, klima og landskaps-utvikling i Trøndelag etter siste istid. Vegetation, climate and evolution of the cultural landscape in Trøndelag, Central Norway, after the last ice age. Norsk geogr. Tidsskr. Vol. 41, 101–120. Oslo. ISSN 0029-1951. Based on the essential shifts in vegetation, traced by pollen analysis and radiocarbon measurements of more than a hundred peat and sediment cores from Sør- and Nord-Trøndelag counties, late and post-Weichselian time is subdivided into five climatic periods: 1) The Pre-Warmth Period, comprising a) the treeless tundra during late Allerød and Younger Dryas (ca. 11,500–10,000 B.P.) and b) the Preboreal forest essentially of Birch (cf. Betula pubescens aggr.) and with some Aspen (Populus tremula), Juniper (Juniperus communis) and Sea Buckthorn (Hippophaë rhamnoides), up to ca. 9000 B.P.; 2) The Early Warmth Period, up to 8000 B.P., with a dry and fairly warm climate with Pine (Pinus sylvestris) as the dominant forest component; 3) The Optimal Warmth Period, up to ca. 5000 B.P., with a moist and warm climate, enabling Grey Alder (Alnus incana), Hazel (Corylus avellana) and later on also Elm (Ulmus glabra) and probably Alder (Alnus glutinosa) and Cat's Tail (Typha latifolia) to grow in the area; 4) The Late Warmth Period, up to 4000 B.P., reflecting a climatic relapse distinguished by a transient mixed forest of retreating thermophilous and expanding hardy forest components; 5) The Post-Warmth Period, dominated by boreal forest elements such as Pine and Birch and from about the birth of Christ onwards also Spruce (Picea abies).

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