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Activities of dehydrogenase (A), protease (B), β-glucosidase (C), alkaline phosphomonoesterase (D) and acid phosphomonoesterase (E) for different compartments of burrow system (BW, burrow wall; TZ, transitional zone; BS, bulk soil; CA, cast aggregates). Error bars represent 0.95 confidence intervals. The different letters indicate significant differences between the compartments at P < 0.05.
