The "Bór na Czerwonem" peat bog is located in the southern part of Poland, in the Małopolska province in the Nowy Targ commune. The nature reserve was established here in 1925. The location of the peat bog can be determined by geographical coordinates: 49º27'31.91" N and 20º02'29.14" E. The peat bog belongs to a domed raised bog. At its highest point it reaches a height of 617.3 m a.s.l., and the surroundings are located lower by about 2.2 m. Its length is about 1000 m and width 500 m. The central part of the reserve is a a domed raised bog with an area of about 36 ha, the entire reserve currently covers about 114.66 ha, and its buffer zone 68.4 ha
Samples (cores) from trees were taken with Pressler borer at a height of 1.3-1.5 m a.g.l. during the 2024 growing season. Discs were collected from the ground surface in December 2024 from trees previously removed during peatland reclamation – winter 2023/2024. In total, cores were collected from 23 trees and discs from 45 trees. Tree-ring width (TRW) was measured under a stereoscopic microscope down to 0.01 mm, using LBD_Measure software (version 1.0). A total of 140 measuring radius and 7285 tree-rings were measured. Due to the high pith eccentricity, the large number of rings with compression wood, the large number of missing rings and the low statistical and graphical agreement for measurements from discs, it was decided to base the chronology only on samples from cores.
The BC chronology representing P. sylvestris and P. xrhaetica (cores) growing in the “Bór na Czerwonem” peat bog was compiled from 16 individual growth curves, and spans 59 years from 1965 to 2023. For the period of 42 years (1982-2023) EPS > 0.85. The sequences included in the chronology are characterized by high graphical and statistical consistency (mean correlation 0.587). The average TRW of the studied trees is 1.2 mm/year, ranging from 0.8 (BC14) to 1.6 mm/year (BC15). Standard deviation (STD) for BC chronology is 0.546 mm, while for the indexed chronology it is 0.332 mm, autocorrelation order 1 (AC1) is 0.613 and 0.539, respectively, and mean sensitivity (MS) is 0.283 and 0.245, respectively. In the course of the chronology, a slight downward trend of TRW is observed in the period 1986-2005, and after 2006 TRW ranges from 0.9 to 1.6 mm/year.
File with data of P. sylvestris and P. xrhaetica local chronology (BC chronology): 1st column - year, 2nd column and next - tree-ring width (TRW) of individual trees in mm (tree1, tree2, …), next column - local chronology in mm (bold numbers), last column - number of samples in a given year.
(2025-03-20)
