Climatically induced regeneration patterns of marginal populations of Pinus sylvestris in northern Sweden
The age-structure of Scots Pine (Pinus sylvestris L.) was analysed in climatically marginal populations in northernmost Sweden. The regeneration pattern (1450-1990 A.D.) was clearly episodic in character. Distinct peaks were evident for the periods 1540-1569, 1650-1659, 1750-1739. 1B20-1839, 1870-1879. 1920-1359 and 1970-1979. Regeneration gaps occurred for the periods 1570-1649, 1660-1749, 1790-1019. 1840-1849, 1880-1919 and 1980-1989. Peaks and troughs were in good variance with warmings and coolings, respectively, inferred in a previous dendrochronological analysis of pine in the same region (Briffa et si. in press). On this basis it is suggested that in the absence of major disturbance regeneration dynamics of pine in marginal habitats is foremost a function of summer temperature, rather than autogenic stand dynamics.
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