Changes of Urease and Phosphatase Activities Under Water and Lead Stress

doi:10.11924/j.issn.1000-6850.2013-0636

Abstract

Abstract: The activities of urease and phosphatase in Lou soil were investigated and the relationships between the enzymatic activities and the contents of lead, water as well as soil properties were discussed through water-containment cultivation of Lou soil with added lead, in order to explore the feasibility that soil enzyme indicates soil heavy metal pollution. The results showed that, urease and phosphatase activities increased under 80%, 60%, decreased with lead content increasing, the two enzymatic activities were 43.7%, 61.9% against that in control respectively. Path analysis showed that, the sequence of factors based on their direct effect on urease activity is: available K > organic matter > lead > total N > available P > pH > water content, the sequence of factors on their direct effect on phosphatase activity is: organic matter > lead > total N > water content > pH > available K > available P, meaning that available K is the most important factor that affects urease activity and lead, organic matter are the most important factors for phosphatase. Soil enzymatic activities were affected by lead, water content and soil properties, however phosphatase activity was more vulnerable to than urease activity.

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