Microbial activities in soils of a healthy and a declining reed stand |
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Authors: | T. Picek F. Lusby H. Čížková H. Šučková M. Šimek J. Květ L. Pechar |
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Affiliation: | (1) Institute of Soil Biology, Academy of Sciences of the Czech Republic, Na sádkách 7, CZ 370 05 eské Budjovice, Czech Republic;(2) Faculty of Biological Sciences, University of South Bohemia, Braniovská 31, eské Budjovice, Czech Republic;(3) Department of Geography, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, U.K.;(4) Institute of Botany, Academy of Sciences of the Czech Republic, Dukelská 145, CZ 379 82 Tebo, Czech Republic |
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Abstract: | Microbial processes were investigated in the soil of a declining, more eutrophic (Romberk West) and a healthy looking, less eutrophic (Romberk East) freshwater reed stand. Soil was sampled monthly from June to September 1997. Glucose induced carbon dioxide (CO2) production in oxic and anoxic conditions, methane (CH4) production, nitrification and denitrification activities were measured in laboratory conditions in suspensions prepared from homogenised soil samples. Within a stand the proportion of anaerobic (as opposed to aerobic) microbial activity was greatest in June. Potential methanogenesis was highest in June and decreased later in both stands. Methane production was approximately the same in June at both stands but it was higher at Romberk East than at Romberk West stand in later months. Denitrifying activity was higher in August than July at both stands. Nitrifying activity was undetectable at both stands over the entire study period. Generally Romberk West was more anaerobic than Romberk East, with lower redox potential, higher amounts of oxygen-consuming organic matter and a lower ratio of CO2 production in oxic conditions to CO2 production in anoxic conditions. Microbial activity was apparently restricted at Romberk West stand in comparison to Romberk East. The shift from aerobic to anaerobic microbial metabolism and a coinciding restriction of metabolic activities at Romberk West are thought to be indicative of a strengthened oxygen stress in the soil, associated with accumulation of metabolites toxic to both the microorganisms and the reed. Possible links between eutrophication, microbial characteristics and reed performance are discussed. |
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Keywords: | reed dieback eutrophication decomposition processes denitrification carbon dioxide methane nitrous oxide |
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