Determination of the age of Pinus occidentalis in La Celestina, Dominican Republic, by the use of growth rings.
The growth rings of Pinus occidentalis trees in La Celestina, Dominican Republic, show between-tree uniformity. Two mean time series were made from ring widths of (1) all visible, including intra-annual, rings and (2) groups of rings that were hypothesized to be annual. Both were compared with a 63-year range of rainfall data. An annual periodicity in wood formation was found to be present, but was obscured by many intra-annual rings. The annual periodicity of the trees may be a remnant of their possible origin from higher altitudes, where frosts may have occurred during the cold season. The youngest of the 7 investigated trees was about 39 years old; the oldest about 46 years. These seven trees contained between approximately 2 and 6 growth rings per year, with an average of about 3.5-4.