Abstract
The soils of Galicia, which are acid and rich in organic matter, only exhibit acid phosphatases with maximum activity in the range pH 4.5–6.5, the precise optimum depends on the pH of the soil horizon. Michaelis-Menten kinetics with very high values of K m show the substrate to be adsorbed by the soil in accordance with the Freundlich equation. When adsorption is taken into account, the corrected values K' m are much lower and agree with those reported in the literature. V max and K' m exhibit positive linear correlation, and are higher in förnas than in woodland A-horizons or meadows. Calculation of thermodynamic parameters shows that in förna the efficiency of the enzyme does not depend on temperature, which reflects the enzyme's adaptation to the medium.
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