My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 51 No. 1, p. 102-106
     
    Received: Feb 28, 1986
    Published: Jan, 1987


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1987.03615995005100010022x

Simulation of Nitrogen-15 Immobilization by the Model NCSOIL1

  1. Aviva Hadas,
  2. J. A. E. Molina,
  3. Sala Feigenbaum and
  4. C. E. Clapp2

Abstract

Abstract

The computer model NCSOIL computes the dynamics of C and N transformations in soil. In its original version, the microbial biomass assimilated organic N from the decay of organic pools, and inorganic N was immobilized only when decomposed organics were deficient in N with respect to biomass needs for growth (NCSOIL—direct version). A new version was presented in which it was assumed that microbial biomass immobilized N only from the inorganic pool, while the decay of organic N always resulted in N mineralization (NCSOIL-MIT version). NCSOIL-MIT was calibrated and tested for the incorporation of inorganic 15N in the organic soil N against experimental data and compared with the direct version. Net N mineralization was highly sensitive to the microbial efficiency of soil decomposable organic C incorporation. An efficiency of 0.2 gave a good account of net N mineralization for soils unamended with organic substances. NCSOIL-MIT simulated the incorporation of 15N, added as NH4, into the organic soil pools. The kinetics of 15N immobilization was sensitive to microbial efficiency as well as to other parameters that control soil N turnover. NCSOIL—direct version required the decomposition of polysaccharide-like material in order to obtain 15N incorporation in the soil organic pools, and the kinetics of 15N immobilization depended on the rate of polysaccharide decomposition.

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

Copyright © . Soil Science Society of America