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respiration method (SIR) and expressed as mg C x kg -1 dry soil and respectively mg CO 2 x 100 g -1 soil ( 15 ). Ecological parameters (structural indices) represented by the total counts, relative abundance, species richness (S), species diversity (H’), homogeneity (equitability)(ε) and species frequency revealed the particularities of each community and the status of a certain species. The frequency of each taxa registered allowed their grouping in 4 classes of constancy, respectively in euconstant, constant, accessory and accidental taxa ( 16 ). Similarity indices