1. Les érables dans l’étage subalpin : une longue histoire
- Author
-
Fernand David and Marcel Barbero
- Subjects
Ecology ,biology ,ved/biology ,ved/biology.organism_classification_rank.species ,Forestry ,Pinus cembra ,medicine.disease_cause ,biology.organism_classification ,General Biochemistry, Genetics and Molecular Biology ,food.food ,Alnus glutinosa ,Altitude ,food ,Geography ,Aceraceae ,Pollen ,Terrestrial plant ,medicine ,Holocene ,Chronology - Abstract
Pollen analysis was carried out on lacustrine sediment of a small hollow (15 m × 25 m) at the treeless sub-Alpine belt (202 m) of the inner Maurienne valley in the northern French Alps. A 2 500-year-long maple settlement was demonstrared. Three AMS dates of terrestrial plant macroremains support the chronology. First, Betula and Salix spread prior to 9 000 C14 BP. The first pollen grains of Acer, Abies and Pinus cembra are quoted at 8 600 C14 BP. High frequencies of Alnus glutinosa/incana (20 %) and Acer (10 %) show that mixed communities of Acer and Alnus persisted above the mountainous Abies forest between 7 490 and 5 850 C14 BP. After 5 850 C14 BP, the decrease in Acer stands could be attributed to fire as suggested by the strong increase in Betula and by the delayed expansion of Pinus cembra.
- Published
- 2001
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