1. General Model Information


Acronym: ROOTS

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model, ordinary differential equations
Main application:
Keywords: grassland model, shortgrass prairie, producer, decomposition, translocation, photosynthesis


J.D. Hanson
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.
J.D. Hanson


Hanson, J.D.; Parton, W.J.; Innis, G.S.; Singh, J.S.; Coleman, D.C.


This model was constructed to simulate various above - and belowground compartements of the producer subsystem for a shortgrass prairie. The aboveground compartements were not considered as critical in this model as others since emphasis of the effort was to describe the belowground dynamics in considerable detail. Thus, the aboveground compartements included live shoots, recent and old dead shoots, litter and crowns. The belowground compartement is divided into six layers; each layer contains live and dead juvenile roots, non - suberized roots, and suberized roots. The processes linking the state variables are net photosynthesis, translocation, death of shoots, crowns and roots, litter production, root aging, respiration (crowns and roots), and decomposition. Model output compared favorably with observed data except it tended to overestimate crown and shoot production.

Aboveground processes simulated in the ROOTS model:

Belowground processes simulated in the ROOTS model: (from: Hanson, J.D.; Parton, W.J.; Innis, G.S.; 1985 : Plant growth and product$ A comparison of modelling approaches. Ecological Modelling (29), P. 131-144.)

II. Technical Information

II.1 Executables:

Operating System(s): (please contact the authors)

II.2 Source-code:

Programming Language(s): (please contact the authors)

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Hanson, J.D., Parton, W.J., Innis, G.S.: Plant growth and production of grassland ecosystems - A comparison of modelling approaches. Ecological Modelling (29) 1985, p. 131-144.
Parton, W.J.; Singh, J.S.; Coleman, D.C.: A model ofproduction and turnover of roots in shortgrass prairie.Journal of Applied Ecology, (45) 1978 ,p. 515-542.

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 21:44:48 CEST 2002

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