1. General Model Information
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model, ordinary differential equations
Keywords: grassland model, shortgrass prairie, producer, decomposition, translocation, photosynthesis
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.
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:
- Photosynthesis (soil water, temperature, solar radiation)
- Carbon allocation (variable allocation to soil water ratio,nutrient,leaf
- Death (soil water,temperature,phenology or leaf age).
(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.)
- Carbon allocation (variable allocation to soil water ratio)
- Root growth (soil water,phenology)
- Death (soil water,temperature)
- Uptake (water)
- Respiration (soil water, temperature).
II. Technical Information
Operating System(s): (please contact the authors)
Programming Language(s): (please contact the authors)
III. Mathematical Information
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