Sulphur behaviour in forest soils near the largest SO2 emitter in northern Europeстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The impact of 60 years of SO2 emissions from a nickel-copper plant in the Kola Peninsula (Russia) on soil sulphur contents was assessed in podzols under pine forests. Sulphate desorption and the possible delay of acidification reversal was investigated, because the plant will be reconstructed in 2006 with an expected emission reduction of 90%. Sites were sampled along a pollution gradient in the prevailing wind direction within 1 to 66 km distance. The investigated podzols stored sulphur mostly in the organic form. The concentrations of total and organic sulphur in soil organic horizons tended to be higher near the smelter but were only weakly correlated with sulphur deposition. No relationship between distance to smelter and S contents was found for the mineral horizons. Sulphate content and desorption behavior were highly variable due to natural variations of texture and extractable Al and Fe contents of the soils. The lack of a clear strong trend with distance from the smelter except in the organic layer indicated that long range transport and diffuse input of sulphate played a major role rather than point source impact. We concluded that biological turnover is most likely the regulating process in these soils and we thus expect low to medium release of sulphate under decreasing deposition scenarios because organic sulphur was the dominant fraction of total sulphur in all soils.