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13C in tree rings along an air pollution gradient in the Karelian Isthmus, northwest Russia and southeast Finland
- Niemela, P., Lumme, I., Mattson, W., Arkhipov, V.
- Canadian journal of forest research = 1997 v.27 no.4 pp. 609-612
- Pinus sylvestris, carbon, isotopes, air pollution, growth rings, sulfur, nitrogen, iron, calcium, nitrates, dendrochronology, ammonium compounds, Russia, Finland
- We measured delta 13C in the annual rings (years: 1954-1992) of Scots pine (Pinus sylvestris L.) trees in nine sample plots of an air pollution monitoring network in northwest Russia and southeast Finland. Trees in plots closer to the pollution sources tended to have less negative delta 13C values (> 13C in their wood) than those in more distant, northern plots. Moreover, between about 1960 and 1992, there was a tendency for delta 13C to become increasingly negative (i.e.,< 13C) in five of the plots. In four plots delta 13C values fluctuated about their mean without any time trend. The results suggest that the forests nearest the pollution sources were more severely stressed during the first 3 decades than final 1 of the sample period, probably because of the heavy, chronic S and N emissions originating from the St. Petersburg region and northeast Estonia, and probably also Central Europe.