Incendies et peuplements à Pinus mugo Turra dans les Alpes occidentales (Val de Suse, Italie) durant la transition tardiglaciaire-holocène: un zone refuge évidente

In western Italian Alps, small distinct populations of Pinus mugo Turra raise some questions concerning its ecological status and dynamics in the occidental Alps. This note present new palaeobotanical data based on cone imprints of Pinus mugo, identified in travertine systems located in the Val di Susa and dated back to the Late Dryas (11 506±66 BP) and the Early Holocene (10 145± 225 et 9475± 670 BP). Heliophilous species and charcoal fragments were also identified, testifying to the oldness of wildfires in this region. The data support the hypothesis that this zone was a refuge area of this pine during the last glaciation. Here we discuss about the postglacial dynamics of the Pinus mugo in the occidental Alps