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Nutrient composition, microbial biomass and enzyme activity in the litter and organic soil of a P. abies forest before and after a tree dieback caused by a bark beetle invasion. The data represent the means of three replicates with standard errors. Statistically significant differences among seasons are indicated by different letters. Right-hand axis displays variables indicated in red; abbreviations: Nmin – mineral N, Norg – organic N, NAGase – N-acetylglucosaminidase.
