The climatic response of Phyllocladus aspleniifolius (Labill.) Hook. f in Tasmania

Aim To examine the response of ring widths of Phyllocladus aspleniifolius t o maximum and minimum temperatures and to a zonal index (ZI). Location Tasmania, Australia. Methods Between two and four increment cores were obtained from approximate ly 20 trees at each of 16 sires of P. aspleniifolius across Tasmania. Four regions were defined and temperature data for climate stations from each of these regions were transformed into dimensionless time series appropriate for each region. The ZI was constructed from Melbourne and Hobart mean sea level pressure (MSLP). Correlations were calculated between climate data an d ring widths over most of the 20th century. Data were then segregated into two subperiods to assess whether or not temporal changes in ring width res ponse have occurred over the 20th century. Results The dominant feature of the correlation functions was a negative co rrelation with temperatures of the previous growing season. Correlation bet ween the ZI and ring width is most significant, and positive, in November a nd March of the previous growing season. Differences in the shape of the co rrelation functions, and their strength is apparent over the course of the century. In general, correlations have become weaker and less consistent am ong the 16 sites for the latter part of the century. Temperatures have gene rally increased during the 1900s over which time period correlations have b een calculated. Main conclusions The temporally changing climatic response in ring widths i s consistent with a hypothesis of competition for resources between differe nt parts of a plant. A nonlinear response to climate over a short-time peri od violates one of the basic assumptions of dendroclimatology, therefore su ggesting further investigation of both the physiology of trees used for den droclimatological purposes and the statistical methods used for climatic re construction.