1. General Model Information
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model
Keywords: grassland, domestic herbivores, plant growth, forage, sheeps, grazing
Domestic herbivores are the primary concern of this model, thus a plant growth
routine is included only so grazing material is available. Those parts of the
plant that cannot be consumed by livestock are ignored.
Plant growth is subsequently determined as the daily increase in weight of the
forage divided by its initial weight (relative growth rate). This type of
forage approximation may be appropriate considering the objectives
of the study. However, there is no mechanism in this model to investigate the
response of plant species to grazing, thus the model is of little use when
considering the entire system.
Aboveground processes simulated in the SHEEP model:
No belowground processes were simulated in the SHEEP model.
- Growth (soil water, temperature)
- Carbon allocation (fixed allocation).
(from: Hanson, J.D.; Parton, W.J.; Innis, G.S.; 1985 : Plant growth and production of grassland ecosystems:
A comparison of modelling approaches. Ecological Modelling (29), P. 131-144.)
II. Technical Information
III. Mathematical Information
Hanson, J.D.; Dye ,A.J.; 1980: Diurnal and seasonal patterns of photosynthesis of honey mesquite.Photosynthetica, (14), P. 1-7.Hanson, J.D.; Skiles, J.W.; Parton, W.J.; submitted. A multispecies model for spatially heterogeneous rangeland plant communities. Ecological Modelling.Hanson, J.D.; Parton, W.J.; Innis, G.S.; 1985: Plant growth and production of grassland ecosystems -A comparison of modelling approaches. Ecological Modelling (29), P. 131-144.Skiles, J.W.; Hanson, J.D.; Parton, W.J.; 1983: Simulation of above- and belowground carbon and nitrogen dynamics of Bouteloua gracilis and Agropyron smithii. In: W.K. Lauenroth; G.V. Skogerboe; M.Flug (Editors),Analysis of ecological systems : State-of-the-Art in Ecological Modelling. Developments in Environmental Modelling,(5), Elsevier, Amsterdam/Oxford/New York, P. 467-473.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 08. 07. 1997 -
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:49 CEST 2002