[Effect of arsenic on soil urease activity].

By simulation method, this paper studied the urease activity in arsenic polluted soils. The results showed that arsenic could activate soil urease activity after added for one year. With arsenic addition, soil urease activity remarkably increased, and there existed a significantly positive correlation. The Vmax of soil urease increased with arsenic addition, while the Km of urease in high and low fertility soil was unchanged and slight increased, respectively. It is proved that As could accelerate the separating velocity of enzyme-urea complexes. This paper also illustrated that soil properties were important to study the relationship between soil enzyme and pollutants.