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• W1998727417 abstract "Abstract The rationale of the study was to investigate microbial activity in different soil horizons in European forests. Hence, activities of chitinase and cellulase, microbial biomass carbon ( C mic ) and basal respiration were measured in litter, fragmentation, humus and mineral soil layers collected several times from various beech and spruce forests. Sites were selected to form a gradient in N availability. Analyses were also performed on beech litter from a litterbag transplant experiment. Furthermore, microbiological parameters were measured in horizons of beech and spruce chronosequence sites with different stand age in order to investigate the influence of forest rotation, and hence changes in soil organic matter (SOM) dynamics, on microbial activity. Finally in horizons of one beech forest, the seasonal variation of selected microbiological parameters was measured more intensively. β-Glucosaminidase and cellobiohydrolase activities were measured using fluorogenic 4-methylumbelliferyl substrates to estimate chitinase and cellulase activities, respectively. On a spatial scale, chitinase and cellulase activities, C mic determined by substrate induced respiration, and basal respiration ranged from 144 to 1924 and 6–177 nmol 4-MU g −1 org-C h −1 , 8–48 mg C g −1 org-C and 11–149 μg CO 2 –C g −1 org-C h −1 , respectively; in general values were significantly lower in layers of humus and mineral soil than of litter. Chitinase activity, C mic and basal respiration from humus and mineral soil layers, together, correlated positively, while none correlated with cellulase activity. Similarly in the litter layer, no correlations were found between the microbiological parameters. On a seasonal scale, a time lag between a burst in basal respiration rate and activities of both enzymes were observed. In general, activities of cellulase and chitinase, C mic and basal respiration, did not change with stand age, except in the humus layer in the spruce chronosequence, where C mic decreased with stand age. In the litter layer, cellulase activity was significantly and positively related to the C:N ratio, while only a tendency for chitinase activity was shown, indicating that enzyme activities decreased with increasing N availability. In accordance, the enzyme activities and C mic decreased significantly with increasing chronic N deposition in the humus layer, while basal respiration only tended to decrease with increasing N deposition. In contrast, enzyme activities in beech litter from litterbags after 2 years of incubation were generally higher at sites with higher N deposition. The results show different layer-specific responses of enzyme activities to changes in N availability, indicating different impacts of N availability on decomposition of SOM and stage of litter decomposition." @default.
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• W1998727417 date "2004-10-01" @default.
• W1998727417 modified "2023-10-14" @default.
• W1998727417 title "Microbial enzyme activities in leaf litter, humus and mineral soil layers of European forests" @default.
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• W1998727417 doi "https://doi.org/10.1016/j.soilbio.2004.07.018" @default.
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