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Fredskild, Bent
The Holocene vegetational development of the Godthåbsfjord area, West Greenland

1983, 28 s., hft.
19 x 26,5 cm, 11 tavler i lomme
ISBN 978-87-635-1153-7
Serie: Monographs on Greenland | Meddelelser om Grønland, vol. 232
ISSN 0025-6676
Serie: Geoscience, vol. 10
ISSN 0106-1046



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Holocene pollen and macrofossil diagrams from four low arctic lakes at Godthabsfjord are presented. Each core has been divided into radiocarbon-dated palaeovegetation zones, based on the remnants of terrestric plants. The PV zones are physiognomically similar, but differences as to the composition and frequency of species can be seen between the two lakes in the interior and the two lakes fronl the outer coast area. The vegetation which invaded the deglaciated soil was open but rich in species, and 64 species or genera have been determined from the pioneer stage (c. 9400-8000 B.P.). Open soil plants were dominating, but dwarf-shrubs entered the vegetation, with species from snow-patches and snow-covered heaths dominating in the beginning. By c. 8000 B.P. Salix glauca and S. herbacea immigrated, and gradually the pioneer plants and chionophilous dwarf-shrubs were decimated. This Salix-Cyperaceae stage lasted until c. 6300 B.P., when Betula nana spread all over the area within a few centuries. A Betula nana-Juniperus stage lasted until c. 3500 B.P. In the subcontinental interior this was followed by an Alnus crispa-Betula nana stage, which in turn was replaced by a Betula nana-Ericales stage around 1800 B.P. Alnus has never been able to grow at the maritime outer coast, where Betula, Cyperaceae, Empetrum and other Ericales dominated after c. 3500 B.P. Later on, Empetrum, Cyperaceae and snowbed plants gradually spread at the expence of Betula nana.

After the deglaciation the temperature increased, reaching today's values between 8000 and 7500 B.P. At which time during the coming millennia the temperature curve peaked is not known, but it may have been fairly late, presumably during the Betula nana-Juniperus stage. Major climatic changes are registered in the interior at 3900-3600 and 1800 B.P., and at the outer coast at c. 3600 and 2500-2000 B.P.

From around 8000 B.P. the development of the lakes is fairly independent of the physical conditions of the surroundings, being dependent mainly on the trophic stages of the lakes. These pass through a succession: highly productive, eutrophic -less productive, mesotrophic -very poor, oligotrophic. As well as in the flora and fauna, these stages are reflected in the sediment, which at the beginning was a clay gyttja followed by a jelly-like gyttja and, finally, by a loose, watery gyttja consisting mainly of precipitated humus. Chemical analyses of one of the cores confirnl the oligotrophication.

The pollen influx in the pioneer stage is less than 100 grains per cm2 per year, increasing during the Hypsithermal to c. 300 in three of the lakes and c. 1000 in the richest one, but since then the influx decreases somewhat upwards.

A survey of the immigration or first appearance of some species palynologically important to South and West Greenland shows big time lags in the spreading of some species, e.g. Thalictrum and Angelica, whereas others, like Empetrum and Juniperus, have a more effective dispersal capacity.

 
Emneområde | Arktiske studier |
Specifikt emneord | Palæobotanik | Pollenanalyser |
Verdensdel m.v. | Grønland |
Sprog | Engelsk |

Samtlige udgivelser på forlaget med -

Bent Fredskild som forfatter

The vegetation types of Northeast Greenland
1998, ISBN 978-87-635-1247-3, hft
The vegetation types of Northeast Greenland
1998, ISBN 978-87-635-1247-3, hft
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland
1993, ISBN 978-87-635-1220-6, hft
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland
1993, ISBN 978-87-635-1220-6, hft
The Holocene vegetational development of Tugtuligssuaq and Qeqertat, Northwest Greenland
1985, ISBN 978-87-635-1166-7, hft
The Holocene vegetational development of Tugtuligssuaq and Qeqertat, Northwest Greenland
1985, ISBN 978-87-635-1166-7, hft

Bent Fredskild som redaktør

The Greenland Mountain birch zone, Southwest Greenland
1990, ISBN 978-87-635-1204-6, hft
The Greenland Mountain birch zone, Southwest Greenland
1990, ISBN 978-87-635-1204-6, hft
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)
1996, ISBN 978-87-635-1235-0, hft
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)
1996, ISBN 978-87-635-1235-0, hft
 


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Kunder, som har købt denne titel, købte også

A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)     Fredskild, Bent
A phytogeographical study of the vascular plants of West Greenland (62°20'-74°00'N)
1996

A phytogeographical study of South Greenland     Feilberg, Jon
A phytogeographical study of South Greenland
1984

The Greenland Mountain birch zone, Southwest Greenland     Fredskild, Bent & Søren Ødum (red.)
The Greenland Mountain birch zone, Southwest Greenland
1990

A phytogeographical study of the vascular plants of northern Greenland - north of 74 northern latitude     Bay, Christian
A phytogeographical study of the vascular plants of northern Greenland - north of 74 northern latitude
1992

Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland     Böcher, Jens & Bent Fredskild
Plant and arthropod remains from the palaeo-Eskimo site on Qeqertasussuk, West Greenland
1993





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