Abstract
Knud Jessen (1935) fixed the border between his pollen zones VII-VIII which, broadly speaking, separates the Atlantic period from the Sub-Boreal period in Danish pollen diagrams, at the level "where the curve for the Oak Mixed Forest bends inwards, often because the frequency of the linden especially drops quickly".
Highlights
KNuo JESSEN (1935) fixed the border between his pollen zones VII- VIII which, broadly speaking, separates the Atlantic period from the Sub-Boreal period in Danish pollen diagrams, at the level "where the curve for the Oak Mixed Forest bends inwards, often because the frequency of the linden especially drops quickly".In 1941 IVERSEN in his paper "Land Occupation in Denm ark's Ston e Age
A Poll en-Analytical Study of the Influence of Farmer Culture on th e Vegetational Development" pointed out, that this characteristic fall in the curve for the oak-forest indicates a human interference - a land occupation - where forest was cleared in order to make room for fields and pastures
IVERSEN thought that the decline of ivy, especially, indicates a change from an Atlantic climate with mild winters to a more continental one with cold winters
Summary
KNuo JESSEN (1935) fixed the border between his pollen zones VII- VIII which, broadly speaking, separates the Atlantic period from the Sub-Boreal period in Danish pollen diagrams, at the level "where the curve for the Oak Mixed Forest bends inwards, often because the frequency of the linden especially drops quickly". As a result of inves tigations which SvEND J~RGENSEN , deputy keeper of the National Museum, and I have carried out in the West-Zealand bog Aamosen and in Switzerland through a number of years, I have reached the opinion that the decline of the elm curve may not have been due to a change in climate. A Contribution to the Study of the Post-Glacial Temper ature Climate" (1944), Dr IvERSEN mentions his investigation of the relationship of those plants to th e summer and winter temperatures. Occurrences of the plant species concerned may be indicated with the summer and winter temp er atures at their growing places as co-ordinates In this way it is possible to determine the temperature r equirements of the species mentioned, or their "thermosphere"
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