Microbial activity in reclaimed and unreclaimed post-mining sites near Sokolov (Czech Republic) |
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| Authors: | Monika Helingerová Jan Frouz Hana Šantrůčková |
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| Institution: | 1. School of Land Science and Technology, China University of Geosciences, Beijing 100083, People''s Republic of China;2. Key Laboratory of Land Consolidation and Rehabilitation, The Ministry of Land and Resources, Beijing 100035, People''s Republic of China;1. Institute for Environmental Studies & SoWa RI, Faculty of Science, Charles University in Prague, Benátská 2, 128 44 Prague 2, Czech Republic;2. Institute of Soil Biology & SoWa RI, Biology Center CAS, Na Sádkách 7, 370 05 ?eské Budějovice, Czech Republic;3. Laboratory of Environmental Biotechnology, Institute of Microbiology of the CAS, Vídeňská 1083, 142 20 Prague 4, Czech Republic;4. Laboratory of Environmental Microbiology, Institute of Microbiology of the CAS, Vídeňská 1083, 142 20 Prague 4, Czech Republic;5. Department of Environmental Sciences, University of Helsinki, FI-15140, Lahti, Finland;6. Department of Ecology, School of Biology, Aristotle University, 54124 Thessaloniki, Greece;7. Centre for Agri-Environmental Research, University of Reading, Reading RG6 6AR, United Kingdom;1. Department of Soil Science and Soil Protection, Agriculture and Economy Faculty, University of Agriculture in Krakow, Al. Mickiewicza 21, 30-120 Krakow, Poland;2. Department of Forest Ecology and Reclamation, Institute of Ecology and Silviculture, Faculty of Forestry, University of Agriculture in Krakow, Al. 29 Listopada 46, 31-425 Krakow, Poland;3. Institute for Environmental Studies, Faculty of Sciences, Charles University, Benátská 2, Prague 120 28, Czech Republic;4. Institute of Soil Biology & SoWa Biology Center ASCR, Na Sáckách 7, 370 05 Ceske Budejovice, Czech Republic |
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| Abstract: | Microbial activity reflects soil conditions and degree of development. The aim of this study was to compare microbial properties of reclaimed and unreclaimed post-mining soil. Microbial biomass, microbial respiration, and cellulose decomposition were quantified in two chronosequences of post-mining sites located in the Sokolov brown-coal mining area. The first chronosequence consisted of five sites reclaimed with an alder plantation (Alnus glutinosa, Alnus incana), and the other consisted of five unreclaimed sites naturally colonized by local vegetation (especially Salix caprea, Betula pendula and Populus tremula). The spoil material of all the studied sites consisted of tertiary clays without any topsoil cover.Microbial respiration per unit of soil mass as well as per unit of soil area decreased as site age increased. Microbial biomass, whether expressed as a function of soil mass or area, increased with site age in both reclaimed and unreclaimed sites. When expressed per m2, proportion of deeper soil layers (5–10 cm) on overall microbial biomass in 0–10 cm layer increased with site age. This increase was more pronounced in reclaimed than in unreclaimed sites. Cellulose decomposition was highest in 8-year-old sites in the reclaimed chronosequence and in 17–21-year-old sites in the unreclaimed chronosequence. The cellulose decomposition rate was higher in reclaimed than in unreclaimed sites. In reclaimed sites, the decomposition rate depended on air temperature, while in unreclaimed sites other factors, such as moisture deficiency, seemed to drive decomposition rate in some locations. Overall, microbial activity increased faster in reclaimed than in unreclaimed sites, and this difference was most evident in younger sites. |
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