 |
| Titel |
Climate and vegetation changes during the Lateglacial and early–middle Holocene at Lake Ledro (southern Alps, Italy) |
| VerfasserIn |
S. Joannin, B. Vanniere, D. Galop, O. Peyron, J. N. Haas, A. Gilli, E. Chapron, S. B. Wirth, F. Anselmetti, M. Desmet, M. Magny |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1814-9324
|
| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-04-09), S.913-933 |
| Datensatznummer |
250018028
|
| Publikation (Nr.) |
 copernicus.org/cp-9-913-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Adding to the on-going debate regarding vegetation recolonisation (more
particularly the timing) in Europe and climate change since the
Lateglacial, this study investigates a long sediment core (LL081) from Lake
Ledro (652 m a.s.l., southern Alps, Italy). Environmental changes were
reconstructed using multiproxy analysis (pollen-based vegetation and climate
reconstruction, lake levels, magnetic susceptibility and X-ray fluorescence
(XRF) measurements) recorded climate and land-use changes during the
Lateglacial and early–middle Holocene. The well-dated and high-resolution
pollen record of Lake Ledro is compared with vegetation records from the
southern and northern Alps to trace the history of tree species
distribution. An altitude-dependent progressive time delay of the first
continuous occurrence of Abies (fir) and of the Larix (larch) development has been
observed since the Lateglacial in the southern Alps. This pattern suggests
that the mid-altitude Lake Ledro area was not a refuge and that trees
originated from lowlands or hilly areas (e.g. Euganean Hills) in northern
Italy. Preboreal oscillations (ca. 11 000 cal BP), Boreal oscillations
(ca. 10 200, 9300 cal BP) and the 8.2 kyr cold event suggest a centennial-scale
climate forcing in the studied area. Picea (spruce) expansion occurred
preferentially around 10 200 and 8200 cal BP in the south-eastern
Alps, and therefore reflects the long-lasting cumulative effects of
successive boreal and the 8.2 kyr cold event. The extension of Abies is
contemporaneous with the 8.2 kyr event, but its development in the southern
Alps benefits from the wettest interval 8200–7300 cal BP evidenced in high
lake levels, flood activity and pollen-based climate reconstructions. Since
ca. 7500 cal BP, a weak signal of pollen-based anthropogenic activities
suggest weak human impact. The period between ca. 5700 and ca. 4100 cal BP
is considered as a transition period to colder and wetter conditions
(particularly during summers) that favoured a dense beech (Fagus) forest
development which in return caused a distinctive yew (Taxus) decline. We conclude
that climate was the dominant factor controlling vegetation changes and
erosion processes during the early and middle Holocene (up to ca. 4100 cal BP). |
| |
|
| Teil von |
|
|
|
|
|
|
|
|