Abstract
The effect of different inputs of mineral N on several enzyme activities involved in the C and N cycles was investigated using Oa material of forest floors from four Norway spruce [Picea abies (L.) Karst.] sites with different C-to-N ratios. The samples from each site were treated with five different concentrations of mineral N (as liquid NH4NO3). All samples were incubated aerobically for 15–20 weeks at 15°C and at field capacity. Respiration was measured weekly. At the end of the incubation period, four enzyme activities (endoglucanase, β-glucosidase, polyphenol oxidase and β-glucosaminidase) and microbial biomass were determined. Endoglucanase activity was increased and β-glucosidase activity was decreased by N additions only in Oa material having a wide C-to-N ratio. In N-supplemented samples of low C-to-N ratio, increased polyphenol oxidase activities were often detected as a consequence of N addition. β-Glucosaminidase activity responded positively to mineral N additions, particularly in Oa samples with low internal N concentration. The results of the present study indicate that the effects of N additions on enzymatic activities of organic matter in late stages of decomposition are related to the C-to-N ratio. Increasing inputs of mineral N to spruce ecosystems may especially affect C-hydrolyzing enzyme activities in soils with wide C-to-N ratio leading to an incomplete degradation of cellulose and thus reduced C availability to micro-organisms.
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Acknowledgements
We thank Alexandra Michel and Uwe Hell for help during the sampling, the Bavarian Forest Authorities for their support and Dr. Gunther Ilgen, Petra Dietrich and Kerstin Moser from the BITÖK central analytical department for C and N measurements. This research was funded by the Deutsche Forschungsgemeinschaft (DFG) and the German Ministry of Education, Science, Research and Technology (BMBF) under grant no. PT BEO-51–0339476.
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Michel, K., Matzner, E. Response of enzyme activities to nitrogen addition in forest floors of different C-to-N ratios. Biol Fertil Soils 38, 102–109 (2003). https://doi.org/10.1007/s00374-003-0622-5
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DOI: https://doi.org/10.1007/s00374-003-0622-5