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Limited acid deposition inferred from diatoms during the 20th century--A case study from lakes in the Tatra Mountains

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Journal of Environmental Sciences 2018年第2期30卷 92-106页

作者： Elwira Sienkiewicz michal gasiorowski Institute of Geological Sciences Polish Academy of Sciences Research Centre at Warsaw St. Twarda SI/SS Warsaw PL-00818 Poland

Mountain lakes are usually sensitive to the effects of global and regional environmental changes. Since the second half of the 20 th century, surface-water acidification has become a significant ecological problem, and many lakes in Europe and North America have anthropogenically acidified. Additionally, following reduction in emissions of sulfur（S） and nitrogen（N） compounds, recovery from acidification has been observed in many lakes. In this study, we used changes in diatom communities to reconstruct the p H histories based on changes recorded in nine Tatra lakes（Western Carpathians, Poland） since approximately1850 AD. Overall, results indicate that acidic precipitation had little influence on lake-water p H in the Tatra Mountain lakes. Changes in diatom-inferred p H（DI-p H） generally were small and showed little evidence of acidification during the time of the highest air pollution（since the 1960 s）, and have shown little change since the reduction of acidic deposition since the 1990 s. Lakes that showed some evidence of acidification included dystrophic lakes with low acid neutralizing capacity. However, as illustrated by the PCA trajectories of the diatom assemblages, the majority of the lakes currently contain diatom assemblages that are unlike the diatom floras that existed ca. 1850.

关键词： Lake Palaeolimnology Environmental impact assessment Algae Acidification Pollution

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