Climate and vegetation changes during the Lateglacial and early-middle Holocene at Lake Ledro (southern Alps, Italy)
Sebastien Joannin
(1, 2, 3, 4)
,
Boris Vannière
(1)
,
Didier Galop
(5)
,
Odile Peyron
(1)
,
J.N. Haas
(6)
,
A. Gilli
(7)
,
Emmanuel Chapron
(8)
,
S.B. Wirth
(7)
,
F.S. Anselmetti
(9)
,
Marc Desmet
(10)
,
Michel Magny
(2, 1)
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
2 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
3 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
4 Quaternary Environments and Geoarchaeology Geography
5 GEODE - Géographie de l'environnement
6 Institut für Botanik
7 Geological Institute
8 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
9 Institute of Geological Sciences [Bern]
10 GéHCO EA6293 - GéoHydrosystèmes COntinentaux
2 MSHE - Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
3 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
4 Quaternary Environments and Geoarchaeology Geography
5 GEODE - Géographie de l'environnement
6 Institut für Botanik
7 Geological Institute
8 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
9 Institute of Geological Sciences [Bern]
10 GéHCO EA6293 - GéoHydrosystèmes COntinentaux
Sebastien Joannin
- Fonction : Auteur
- PersonId : 19986
- IdHAL : sebastien-joannin
- ORCID : 0000-0001-8345-9252
- IdRef : 11417038X
Boris Vannière
- Fonction : Auteur
- PersonId : 170991
- IdHAL : boris-vanniere
- ORCID : 0000-0002-6779-6053
- IdRef : 22094850X
Didier Galop
- Fonction : Auteur
- PersonId : 13698
- IdHAL : didier-galop
- ORCID : 0000-0003-1746-4760
- IdRef : 035586850
Odile Peyron
- Fonction : Auteur
- PersonId : 1192591
- IdHAL : odile-peyron
- ORCID : 0000-0002-7028-6302
- IdRef : 199802378
Emmanuel Chapron
- Fonction : Auteur
- PersonId : 173685
- IdHAL : emmanuel-chapron
- ORCID : 0000-0003-3661-0225
- IdRef : 05773691X
Marc Desmet
- Fonction : Auteur
- PersonId : 938023
- ORCID : 0000-0002-7580-1406
Michel Magny
- Fonction : Auteur
- PersonId : 5658
- IdHAL : michel-magny
- IdRef : 027001652
Résumé
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 (652ma.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 altitudedependent 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).
Domaines
Interfaces continentales, environnement Milieux et Changements globaux Etudes de l'environnementFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Résumé |
en
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 (652ma.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 altitudedependent 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).
|
Titre |
en
Climate and vegetation changes during the Lateglacial and early-middle Holocene at Lake Ledro (southern Alps, Italy)
|
Auteur(s) |
Sebastien Joannin
1, 2, 3, 4
, Boris Vannière
1
, Didier Galop
5
, Odile Peyron
1
, J.N. Haas
6
, A. Gilli
7
, Emmanuel Chapron
8
, S.B. Wirth
7
, F.S. Anselmetti
9
, Marc Desmet
10
, Michel Magny
2, 1
1
LCE -
Laboratoire Chrono-environnement (UMR 6249)
( 57629 )
- 16, route de Gray - 25030 Besançon Cedex
- France
2
MSHE -
Maison des Sciences de l'Homme et de l'Environnement Claude Nicolas Ledoux (UAR 3124)
( 2228 )
- 32-36, rue Mégevand 25030 BESANCON CEDEX
- France
3
LGL-TPE -
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
( 153787 )
- Université Claude Bernard, Lyon1 - Campus de la Doua, bâtiment Géode - 2, rue Raphaël Dubois - 69622 Villeurbanne Cedex
École Normale Supérieure de Lyon - 46, Allée d'Italie - 69364 Lyon cedex 07
Université Jean Monnet - Faculté des Sciences et Techniques - 23 rue du Dr Paul Michalon - 42023 Saint Étienne Cedex 02
UMR CNRS 5276
- France
4
Quaternary Environments and Geoarchaeology Geography
( 225027 )
- Royaume-Uni
5
GEODE -
Géographie de l'environnement
( 742 )
- 5 Allée Antonio Machado 31058 TOULOUSE CEDEX 1
- France
6
Institut für Botanik
( 225028 )
- Autriche
7
Geological Institute
( 220076 )
- Suisse
8
ISTO -
Institut des Sciences de la Terre d'Orléans - UMR7327
( 187882 )
- Campus Géosciences 1A, rue de la Férollerie 45071 Orléans cedex 2
- France
9
Institute of Geological Sciences [Bern]
( 82342 )
- Baltzerstrasse 1+3, 3012 Bern, Switzerland
- Suisse
10
GéHCO EA6293 -
GéoHydrosystèmes COntinentaux
( 210715 )
- Faculté des sciences et techniques bâtiment E Parc Grandmont 37200 TOURS
- France
|
Numéro |
2
|
Volume |
9
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2013
|
Page/Identifiant |
913-933
|
Domaine(s) |
|
DOI | 10.5194/cp-9-913-2013 |
Origine :
Accord explicite pour ce dépôt
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