Fig. 1 Influence of pentachlorophenol (PCP) concentration on activities of aerobic and methanogenic microorganisms in mineral TAL (A–C) and organic W8 (D–F) wetland soils: (A) and (D) CO₂ production; (B) and (E) CH₄ production; and (C) and (F) PCP degradation. Each value represents the mean of three replications ± one standard deviation. EC_50(total) represents the total PCP concentration in the soil (dry weight basis) that inhibits microbial activity by 50%