Inherent - Soil enzymes have varying optimum pH and temperature values at which they function most
effectively. For example, the activity of phosphatase, aryl sulfatase, and amidase involved in phosphorus, sulfur, and
nitrogen cycling, respectively, is strongly correlated to variations in soil pH. Since enzyme structure and substrate
binding can be altered by heat and extreme cold temperature, enzyme activity decreases above and below
the optimum temperature. The activity of many enzymes often correlates with soil moisture content, as well.
Drought may suppress enzyme activity. Soil texture influences enzyme activity, and normally enzyme activities
are significantly and positively correlated with clay content. Clayey soils have greater ability to store organic
matter that promotes microbial communities, and clay forms clay-enzyme complexes.