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Abstract:
Intra-annual tree-ring parameters are increasingly used in dendroecology thanks to their
high temporal resolution. To better understand the nature of intra-ring proxy signals, we compared
old and young trees according to the different ways in which they respond to climate. The study was
carried out in central Siberia (Russia, 60750 N, 89380 E) in two even-aged Pinus sylvestris L. stands
of different ages (20 and 220 years). Ring width, cell size, and intra-annual 13C were measured for 4
to 27 tree rings, depending on age group (young vs. old) and tree-ring parameter. Wood formation
was monitored to link tree-ring position to its time of formation. Results indicated more distinct
intra-annual 13C patterns at both the beginning and end of the ring of young trees compared to
old ones. Older trees showed a stronger significant correlation between 13C across the ring border,
indicating a stronger carry-over effect of the previous year’s growing conditions on current year
wood production. This suggests that tree age/size influences the magnitude of the transfer of mobile carbon reserves across the years.
