About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in SSSAJ

  1. Vol. 47 No. 5, p. 945-951
     
    Received: Sept 8, 1982
    Accepted: Mar 5, 1983


 View
 Download
 Alerts
 Permissions
Request Permissions
 Share

doi:10.2136/sssaj1983.03615995004700050021x

Relationships Between Enzyme Activities and Microbial Growth and Activity Indices in Soil1

  1. W. T. Frankenberger and
  2. W. A. Dick2

Abstract

Abstract

Soil enzyme activities are often used as indices of microbial growth and activity in soils. Quantitative information concerning which soil enzymes most accurately reflect microbial growth and activity is lacking. Relationships between the activities of 11 soil enzymes and microbial respiration, biomass, viable plate counts, and soil properties were determined in surface samples of 10 diverse soils. Correlation analyses showed that alkaline phosphatase, amidase, α-glucosidase, and dehydrogenase activities were significantly (P < 0.01) related to microbial respiration as measured by CO2 evolution in soils which had received glucose amendments. Phosphodiesterase, arylsulfatase, invertase, α-galactosidase, and catalase activities were correlated at the 5% level while acid phosphatase and urease activities were not significantly correlated to microbial respiration. There was no significant correlation between the 11 soil enzymes assayed and CO2 evolution in the 10 unamended soils. Only phosphodiesterase and α-galactosidase activities were significantly (P < 0.05) related to microbial numbers obtained on some selective culture media. Alkaline phosphatase, amidase, and catalase were highly correlated (P < 0.01) with microbial biomass as determined by CO2 evolution after chloroform fumigation pretreatment. The organic C content in the 10 surface soils was correlated (P < 0.05) with acid and alkaline phosphatase, phosphodiesterase, arylsulfatase, amidase, urease, and invertase activities. Urease activity was also positively correlated with total N and cation exchange capacity and negatively correlated with the percentage of sand. These relationships suggest that urease can exist in soil as an extracellular enzyme in a three-dimensional network of organo-mineral complexes. Of the 11 enzymes evaluated, alkaline phosphatase, amidase, and catalase were concluded to be the most satisfactory choices in determining the relative activity and mass of the microbial population in soils. The activities of these enzymes were highly correlated with both microbial respiration and total biomass in soils.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America