1. General Model Information
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystems
Type of model: not specified
Keywords: grassland model, grazing management, economics, growth, nutrients,transpiration
USDA Agricultural Research Service, Crops Research Laboratory,
Colorado State University,Fort Collins,CO 80523, USA.
W.J. Parton and G.S. Innis
Natural Resource Ecology Laboratory,
Colorado State University, Fort Collins, CO 80523, USA.
The objective to develop a plant growth model to link a rangeland ecosystem
with range management and range economic systems, constraining the model
to the input requirements of the management and economic models. A substantial
amount of production data was used to construct this conceptually very
simple model. The simplistic model seems adequate for the study because
the objective was to compare grazing management alternatives from the perspective
of maximum economic return. The production portion of this model begins
with a piecewise linear function of soil water for predicting growth. The
growth rate is then modified by temperature and limited so that transpiration
does not exceed available water. Nutrients (including nitrogen, phosphorous,
protein, chlorophyll and vitamin A) and plant water are calculated from
production using piecewise linear relationships.
Aboveground processes simulated in the RANGES model:
- Growth (soil water,temperature, leaf area)
- Carbon allocation (fixed allocation)
No belowground processes were simulated in the RANGES model.
(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
Gilbert, B.J.: RANGES: Grassland simulation model. Range ScienceService, 17, Colorado State University, Fort Collins, CO, 119 pp, 1975.Hanson, J.D.; Parton, W.J.; Innis, G.S.: Plant growth and productionof grassland ecosystems - A comparison of modelling approaches. EcologicalModelling (29) 1985, P. 131-144.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: 28.Apr 1997
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:48 CEST 2002