1. General Model Information

Name: SCUAF - Soil Changes Under AgroForestry.

Acronym: SCUAF


Main medium: terrestrial
Main subject: agriculture, forestry, soil science
Organization level: ecosystem, biocoenosis
Type of model: compartment model
Main application:
Keywords: soil,land use system, agroforestry, erosion, soil organic matter, nitrogen cycle, phosphorus cycling

Contact:

Mr. A. Young.
University of East Anglia, School of Environmental Sciences, 12 Claremont Road, Norwich, NR4 6SH UNITED KINGDOM.
Phone: +44.1603.455461
Fax: +44.1603.455461
email: f.randell@uea.ac.uk

Author(s):

Abstract:

SCUAF is a nutrient-cycling model, designed to be employed by any user. Its purpose is to predict changes in soil properties under specified agroforestry systems within given environments, and for comparison with agriculture and forestry. It can be used in the design of experiments, to extrapolate experimental data (in time or to other treatments), to indicate what data are needed for prediction, and in training. Version 2 covers erosion, soil organic matter, and nitrogen cycling (Young and Muraya, 1990). Version 3 adds phosphorus cycling. It also has a more flexible specification of agroforestry systems; an improved feedback based on nutrient requirements and availability; graphical representation of internal and external nutrient cycling; and added agroforestry-specific elements. Features of SCUAF are: (1) It is a general-purpose model, applicable to all agroforestry systems (Young, 1994). A key basis is percentage areas under trees and crops. (2) The process simulation is relatively simple, and visible to the user. (3) Added agroforestry-specific features in version 3 include separate prediction of changes to soil-under-trees and soil-under-crops; litter/prunings transfer from trees to crops; and effects of tree root growth under crops (all under control of the model user). (4) It is usable: newcomers rapidly learn to use interactively (see Warner, 1991). Some 80% of version 3 was finished in 1992, but, regrettably opportunity has not been found for its completion.

Purpose of the model:

Model parentage:

Source of the AbstractCAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS.
Contract necessary:
Costs: : 50 Eng. pounds sterling.
Comments:

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

Young, A. & P. Muraya, 1990. SCUAF: Soil Changes Under Agroforestry. ICRAF, Nairobi, 124 pp. plus diskette


II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities


III.2.1 Input

III.2.2 Output

Basic spatial unit: Ha.
Time interval of simulation: Year.

IV. References

Young, A., 1990. Modelling changes in soil properties. In: Greenland, D.J. & I. Szabolcs (Ed.). Soil Resilience and Sustainable Land Use. CAB International, Wallingford, UK. 423-447

Young, A. & P. Muraya, 1990. SCUAF: Soil Changes Under Agroforestry. ICRAF, Nairobi, 124 pp. plus diskette
Rohan Nelson, Rob Cramb, Ken Menz and May Mamicpic 1996 Bioeconomic Modelling of Alternative Forms of Hedgerow Intercropping in the Philippine Uplands using SCUAF . IMPERATA Project Paper IPP96/9 (27 pages/460k Encapsuled Postscript)



V. Further information in the World-Wide-Web


  • VI. Additional remarks

    Parentage:
    Last review of this document by: T. Gabele: Dec 10 1997
    Status of the document:
    last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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