Frost ring distribution in Araucaria araucana trees from the xeric Patagonia of Argentina

HADAD, MARTÍN ARIEL; AMOROSO, MARIANO MARTÍN; ROIG

BOSQUE (VALDIVIA)

UNIV AUSTRAL CHILE

Lugar: Valdivia; Año: 2012

0304-8799

Frost rings are defined as anatomically abnormal and ecophysiologically pathological structures. The distribution of frost injuries in Early frost ring, Middle frost ring and Late frost ring in frost-ring chronologies were studied in Araucaria araucana at the northen limit of its distribution. We recorded 121 frost injuries at two sites in the northern xeric distribution of A. Araucana woodlands. Frost rings at both sites are primarily restricted to the Middle frost ring section of the rings. These results represent a preliminary attempt to report and describe the occurrence of these events for this species and region. These proxy records represent important indicators of extreme climatic conditions.