Analysis of tree rings of two atypical pines (Pinus sylvestris L.) in the Borne Sulinowo Forest District

Koprowski M., Zielski A., Skowronek T 2011. Analiza przyrostow rocznych dwoch sosen (Pinus sylvestris L.) o nietypowej budowie strzaly na terenie Nadlesnictwa Borne Sulinowo. Sylwan 155 (8): 555-562. The study aimed at dendrochronological and dendroclimatological analysis of radial increments of two Scots pine specimens of atypical stems (fig. 1). Investigated trees grow in the Borne Sulinowo Forest District (tab.). Although the individuals differ with age, the anomaly occurs almost in the same time (fig. 2). Tree-ring widths of analysed pines show greater similarity before the anomaly onset. Atypical stem construction results in variable growth pattern within individual tree. Samples from 'ridges' are more similar to the master chronology. Climate conditions (temperature in April and June) significantly influence tree ring formation within 'rows' of tree at site #2 (fig. 3-4). Frost damages originating from extremely low temperature in winter 1956 may be the cause of the observed stem anomaly.