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Fig 1.
Location of the sampling site in Świerklaniec and in Poland scale.
Fig 2.
(A) – RWI record for the healthy tree, the declining tree, and the reference trees (B) – δ13C record for the healthy tree, the declining tree, and the reference trees. RWI, ring width index.
Fig 3.
The static correlation function relating δ13C series for A) the healthy tree, B) the declining tree, and C) the reference trees, to temperature and precipitation. The red colour indicates significant correlations (p < 0.05).
Fig 4.
Comparison of the δ13C correlation with SO2 for A) the healthy tree, B) the declining tree, and C) the reference trees.
Fig 5.
iWUE record for the healthy tree, the declining tree, and the reference trees collated with SO2 emissions. iWUE, intrinsic water use efficiency.
Fig 6.
iWUE and SO2 emission correlation for the healthy tree, the declining tree, and the reference trees, presented in the period of high emission (A–C) – and lower emission (D–F) – of SO2. iWUE, intrinsic water use efficiency.