Special Inhibition Parameters 11251 Ecological Dose

The effect of the heavy metal on soil enzyme activity can be quantified by determining the ED50 (ecological dose) parameter, which is the concentration of heavy metal at which the enzyme activity, or some other biological activity, is reduced to 50% of its uninhibited value (Tejada et al. 2008). Tejada et al. (2008) reported that ED50 values may be more suitable indicators of the sensitivity of an ecosystem to stress, because a 50% reduction in the basic ecological process may be too extreme for its continued functioning (Babich et al. 1983). Many researchers have used this inhibition parameter to evaluate soil enzyme inhibition by heavy metals, and their results are summarized in Table 11.4.

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