1. General Model Information

Name: Forest, Agroforests, Low-value Landscape Or Wasteland

Acronym: FALLOW


Main medium: terrestrial
Main subject: landscape ecology,hydrology, agroforests, biodiversity
Organization level: ecosystem
Type of model: not specified
Main application: simulation tool, research, education
Keywords: landscape model, agroforests, land use change

Contact:

Meine van Noordwijk,
Betha Lusiana

ICRAF, Southeast Asian Regional Programme,
Jl. Cifor, Situgede, Sindangbarang,
P.O. Box 161, Bogor 16001,
INDONESIA
Phone: 62-251-625-415;
Fax: 62-251-625-416;
email: m.van-noordwijk@cgiar.org or
b.lusiana@cgiar.org

Author(s):

Meine van Noordwijk,
Soil Ecologist,
ICRAF, Bogor

Betha Lusiana,
Agroforestry Modeller,
ICRAF, Bogor

Rachmat Mulia,
ICRAF, Bogor

Abstract:

FALLOW model of shifting cultivation and crop-fallow rotations, that predicts food self-sufficiency, soil fertility, carbon stocks, plant species richness and watershed functions, on the basis of a number of biophysical and management parameters, for a 100-grid cell landscape.

Shifting cultivation or fallow rotations use the fertility stored in the topsoil and aboveground biomass of a natural vegetation for a few years of cropping, before they allow the system to recover. The FALLOW model implements a simple description of these two phases, first proposed by Trenbath (1984). FALLOW extends the previous description of a single field to a spatially distributed set (100 fields managed by a single entity) to explore the sustainability of crop production for various combinations of:

A number of secondary parameters is available for modifying results, including variability in initial soil fertility and recovery time, and decision criteria for the rice stock to induce intensification or extensification.

FALLOW provides outputs of rice production, food self sufficiency, above and belowground carbon stocks and plant species richness (average per plot and total for the whole landscape), on the basis of input parameters as collected during the Alternatives to Slash and Burn (ASB) project for a number of benchmark sites in the humid tropics.


II. Technical Information

II.1 Executables:

Operating System(s):

II.2 Source-code:

Programming Language(s): STELLA

II.3 Manuals:

Titles:

Van Noordwijk M (2001): Understanding local action and its consequences for global concerns in a forest margin landscape: the FALLOW model as a conceptual model of transitions from shifting cultivation.
In: van Noordwijk M, Williams S and Verbist B.: Towards integrated natural resource management in forest margins of the humid tropics: local action and global concerns.
Lecture Note 11. ASB Teaching Material.

Downloadable from : http://www.icraf.org/sea/Seaasb/ASBSEA.htm



II.4 Data:

FALLOW comes with a number of default input files available in accompanying excel file (FALLOW.xls).

FALLOW homepage

III. Mathematical Information


III.1 Mathematics


III.2 Quantities


III.2.1 Input

III.2.2 Output


IV. References

Van Noordwijk M (2001): Scaling trade-offs between crop productivity, carbon stocks and biodiversity in shifting cultivation landscape mosaics: the FALLOW model.
Ecological Modelling (in press).

Van Noordwijk M (2001): Understanding local action and its consequences for global concerns in a forest margin landscape: the FALLOW model as a conceptual model of transitions from shifting cultivation.
  in: van Noordwijk M, Williams S and Verbist B. Towards integrated natural resource management in forest margins of the humid tropics: local action and global concerns.
Lecture Note 11. ASB Teaching Material.
  http://www.icraf.org/sea/Seaasb/ASBSEA.htm

Van Noordwijk M (1999) Productivity of intensified crop fallow rotations in the Trenbath model.
Agroforestry Systems 47: 223-237.

Trenbath BR (1989) The use of mathematical models in the development of shifting cultivation. In: J. Proctor (Ed.) Mineral Nutrients in Tropical Forest and Savanna Ecosystems,
Blackwell, Oxford.pp 353-369.

Trenbath BR (1984) Decline of soil fertility and the collapse of shifting cultivation systems under intensification.
in: AC Chadwick and SL Sutton (eds.) Tropical Rain-Forest: the Leeds Symposium,
Leeds Philosophical and Literary Society, Leeds. pp 279-292.



V. Further information in the World-Wide-Web


VI. Additional remarks


Last review of this document by: Betha Lusiana, Tue, 13 Nov 2001
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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