The relationships among microbial parameters and the rate of organic matter mineralization in forest soils,as influenced by forest type |
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| Institution: | 1. Department of Zoology, Charles University in Prague, Faculty of Science, Vini?ná 7, CZ-128 44 Prague, Czech Republic;2. Department of Botany, Charles University in Prague, Benátská 2, Faculty of Science, CZ-128 01 Prague, Czech Republic;1. UFZ-Helmholtz Centre for Environmental Research, Department of Soil Ecology, Theodor-Lieser-Str. 4, D-06120 Halle (Saale), Germany;2. Technical University of Munich, Chair for Soil Science, Ingolstädter Landstr. 1, D-85758 Oberschleissheim, Germany;3. University of Freiburg, Faculty of Environment and Natural Resources, Chair of Silviculture, Tennenbacherstr. 4, D-79085 Freiburg i. Brsg., Germany;4. Helmholtz Zentrum München, Research Unit for Environmental Genomics, Ingolstädter Landstr. 1, D-85758 Oberschleissheim, Germany;5. Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, D-07745 Jena, Germany;6. University of Leipzig, Institute of Biology, Johannisallee 21-23, D-04103 Leipzig, Germany;7. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany;1. Institute of Zoology, Justus-Liebig-University, Heinrich-Buff Ring 26-32 (IFZ) , D-35392 Giessen, Germany;2. A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky prospekt, 33, Moscow 119071, Russian Federation;3. Normandie Univ, EA 1293 ECODIV-Rouen, SFR SCALE, UFR Sciences et Techniques, 76821 Mont Saint Aignan Cedex, France;1. Faculty of Biology, Department of Geobotany, University of Freiburg, Schänzlestrasse 1, 79104 Freiburg, Germany;2. Department of Systematic Botany and Functional Biodiversity, University of Leipzig, Johannisallee 21-23, 04103 Leipzig, Germany;3. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany;4. Institute for Landscape Biochemistry, Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Strasse 84, 15374 Müncheberg, Germany;5. Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Birmensdorferstr. 111, 8903 Birmensdorf, Switzerland;6. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany;1. Northwest German Forest Research Station, Department A (Forest Growth), Section Forest Conservation and Natural Forest Research, Grätzelstraße 2, D-37079 Göttingen, Germany;2. Georg-August University Göttingen, Faculty of Forest Sciences and Forest Ecology, Department of Silviculture and Forest Ecology of the Temperate Zones, Büsgenweg 1, D-37077 Göttingen, Germany |
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| Abstract: | Vegetation type influences the rate of accumulation and mineralization of organic matter in forest soil, mainly through its effect on soil microorganisms. We investigated the relationships among forest types and microbial biomass C (MBC), basal respiration (RB), substrate-induced respiration (RS), N mineralization (Nmin), specific growth rate μ, microbial eco-physiology and activities of seven hydrolytic enzymes, in samples taken from 25 stands on acidic soils and one stand on limestone, covering typical types of coniferous and deciduous forests in Central Europe. Soils under deciduous trees were less acidic than soils of coniferous forests, which led to increased mineralizing activities RB and Nmin, and a higher proportion of active microbial biomass (RS/MBC) in the Of horizon. This resulted in more extractable organic C (0.5 M K2SO4) in soils of deciduous forests and a higher accumulation of soil organic matter (SOM) in coniferous forest soil. No effect of forest type on the microbial properties was detected in the Oh horizon and in the 0–10 cm layer. The microbial quotient (MBC/Corg), reflecting the quality of organic matter used for microbial growth, was higher in deciduous forests in all three layers. The metabolic quotient qCO2 (RB/MBC) and the specific growth rate μ, estimated using respiration growth curves, did not differ in soils of both forest types. Our results showed that the quality of SOM in coniferous forests supported microorganisms with higher activities of β-glucosidase, cellobiosidase and β-xylosidase, which suggested the key importance of fungi in these soils. Processes mediated by bacteria were probably more important in deciduous forest soils with higher activities of arylsulphatase and urease. The results from the stand on limestone showed that pH had a positive effect on microbial biomass and SOM mineralization. |
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| Keywords: | Microbial biomass Respiration Ecophysiological quotients Enzyme activities Forest type Soil organic matter |
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