Abstract
Lignite mining and processing has caused a pronounced impact both directly and indirectly on soils and ecosystems across large areas of the former GDR. We studied soils of pine forest ecosystems at sites affected by severe alkaline dust and sulphur deposition, stemming from lignite fired power plant emission, and at dumped sites from lignite mining. In this paper we summarize our main results and evaluate the long-term impact of lignite mining and combustion on the environment.
The pine ecosystems on naturally developed soils show a clear effect of deposition history along a former deposition gradient with distinct changes in chemical properties of organic surface layers and mineral soil as well as in element turnover and cycling rates.
Afforested sites on mining dumps are directly affected by the composition of the dumped substrates. Over a large area (800 km2) these substrates are dominated by Tertiary sediments with varying amounts of lignitic particles and pyrite that result in phytotoxic site conditions (pH < 3, high salt and metal contents). High amelioration doses of liming material (up to 200 t ha−1) were applied for restoration purposes. We studied the development of these sites over a period of 60 years using a false-time series approach. Beside the extreme soil conditions, element budgets of these sites are characterized by very high element release rates over decades caused by pyrite oxidation and primary mineral weathering.
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Schaaf, W., Hüttl, R.F. Direct and Indirect Effects of Soil Pollution by Lignite Mining. Water Air Soil Pollut: Focus 6, 353–364 (2006). https://doi.org/10.1007/s11267-005-9028-8
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DOI: https://doi.org/10.1007/s11267-005-9028-8