The pollen diagram for a peat bog near Col Blegier (2350 m a.s.l.) can be divided into 3 pollen zones: the oldest part (SAL 1) is characterised by a maximum of pine pollen (Pinus mugo/sylvestris type, with a little P. cembra-t.), suggesting local occurrence of sub-Alpine scrub. An intermediate zone (SAL 2) shows an abrupt drop in the pollen concentration, interpreted as a reduction of pine scrub near the site. Pollen zone SAL 3 coincided with the beginning of peat deposition, with an increase of heliophilous species and many taxa typical of Alpine grasslands, as well as anthropogenic indicators. The middle of zone SAL 3 has a radiocarbon date of 1360 ± 60 B.P., calibrated to A.D. 640-685. The most interesting aspect may be the proof of the presence of a mountain pine scrub, which in the late Atlantic reached the ridge and surrounded what then was a small lake on a pass. Interpretation of the diagram was aided by the pollen analysis of moss polsters taken from the edge of the peat bog.

Vegetational history of the “Gran Bosco di Salbertrand” (Val di Susa, NW Italy) by means of pollen analysis.

BRAGGIO, GIULIA;CORNARA, LAURA;PLACEREANI, SANDRA;GUIDO, MARIA ANGELA;MONTANARI, CARLO ALESSANDRO
2000-01-01

Abstract

The pollen diagram for a peat bog near Col Blegier (2350 m a.s.l.) can be divided into 3 pollen zones: the oldest part (SAL 1) is characterised by a maximum of pine pollen (Pinus mugo/sylvestris type, with a little P. cembra-t.), suggesting local occurrence of sub-Alpine scrub. An intermediate zone (SAL 2) shows an abrupt drop in the pollen concentration, interpreted as a reduction of pine scrub near the site. Pollen zone SAL 3 coincided with the beginning of peat deposition, with an increase of heliophilous species and many taxa typical of Alpine grasslands, as well as anthropogenic indicators. The middle of zone SAL 3 has a radiocarbon date of 1360 ± 60 B.P., calibrated to A.D. 640-685. The most interesting aspect may be the proof of the presence of a mountain pine scrub, which in the late Atlantic reached the ridge and surrounded what then was a small lake on a pass. Interpretation of the diagram was aided by the pollen analysis of moss polsters taken from the edge of the peat bog.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/193622
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