1. General Model Information


Acronym: SUNDIAL

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: soil, decomposition, plant, plant debris, animal debris, organic matter


Nicola Bradbury & Jo Smith

Soil Science Department, IACR-Rothamsted, Harpenden, GB
phone: +44 1582 763133
fax: +44 1582 760981
email: nicola.bradbury@bbsrc.ac.uk and josmith@bbsrc.ac.uk



The model simulates the decomposition of soil organic matter.
a) Description of the decomposition of plant and animal debris

Decomposition of plant and animal debris described by a single pool obtained by fitting b) Description of the decomposition of soil organic matter
Decomposition of soil organic matter described by multiple pools as follows: c) Factors assumed to affect organic matter decomposition d) Soil layers used in the model
The model divides the soil into 12 layers as follows: MODEL EVALUATION
Sensitivity analyses have been performed as follows: Good model performance has been defined by simulated results falling within the standard error or standard deviation of the measured data

Statistical methods are used to determine good model performance. as follows:

The model has met the criteria for good model performance in the following ecosystems / climatic regions:
Source of the Abstract: GCTE SOMNET Soil Organic Matter Network Database

II. Technical Information

II.1 Executables:

Operating System(s): DOS 5

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

see input/output table for GCTE models

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

a) Weather data used to run the model i) Data type ii) Temporal resolution of weather data b) Soil data used to run the model c) Plant and animal inputs used to run the model d) Land-use and management inputs used to run the model

III.2.2 Output

a) Soil outputs b) Plant outputs c) Animal outputs d) Other outputs
  • Denitrification, Volatilization from ammoniacal fertilizers

    IV. References

    Bradbury, N.J., Whitmore, A.P., Hart, P.B.S. and Jenkinson, D.S.(1993) Modelling the fate of nitrogen in crop and soil in the yearsfollowing application of 15N-labelled fertilizer to winter wheat. J. Agric.Sci., Camb. 121, 363-379.

    Bradbury, N.J. and Powlson, D.S. (1994) The potential impact of globalenvironmental change on nitrogen dynamics in arable systems. In: SoilResponses to Climate Change (eds M.D.A. Rounsevell and P.J.Loveland), NATO ASI Series, Springer, Heidelberg.

    Jenkinson, D.S., Bradbury, N.J. and Coleman, K. (1994) How theRothamsted Classical Experiments have been used to develop and testmodels for the turnover of carbon and nitrogen in soil. In: Long-termExperiments in Agricultural and Ecological Sciences (eds R.A. Leigh andA.E. Johnston), CAB International.

    Smith, J.U., Bradbury, N.J. and Addiscott, T.M. (1995) SUNDIAL:Simulation of Nitrogen Dynamics in Arable Land. A user-friendly,PC-based version of the Rothamsted Nitrogen Turnover model.Agronomy J. (in press).

    Whitmore, A.P., Coleman, K.W., Bradbury, N.J. and Addiscott, T.M.(1991) Simulation of nitrogen in soil and winter wheat crops: modellingnitrogen turnover through organic matter. Fertilizer Research 27,283-291.

    V. Further information in the World-Wide-Web

    GCTE SOMNET Soil Organic Matter Network Database

    VI. Additional remarks

    Last review of this document by: T. Gabele: Tue Oct 7 1997
    Status of the document:
    last modified by Tobias Gabele Wed Aug 21 21:44:50 CEST 2002

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