1. General Model Information


Acronym: FORSANA

Main medium: terrestrial
Main subject: forestry
Organization level: population, ecosystem
Type of model: not specified (1D)
Main application: research
Keywords: forest growth, plantation, pinus sylvestris, allocation, environmental change


Ruediger Grote
Lehrstuhl für Waldwachstumskunde
Forstwissenschaftliche Fakultät
LMU Muenchen, Weihenstephan
Am Hochanger 13
85354 Freising

Phone: ++49 8161 71 4709
Fax: ++49 8161 71 4720
email: R.Grote@lrz.uni-muenchen.de
Homepage: http://www.wwk.forst.uni-muenchen.de/wwk/People/RGRote/index.html


Ruediger Grote, Felicitas Suckow


FORSANA1.03 - A Physiology-Based Forest Growth Model - Intention FORSANA is intended to be a tool for the estimation of all major pools and fluxes of carbon, nitrogen and water within a forest, including trees, ground vegetation and rooted soil layers. However, because of the assumptions according homogenity, the current version is only suitable for even aged coniferous forests. Structure The forest stand itself is assumed to be horizontally homogeneous and all information is scaled up from average stems to stand area. The canopy and the rooted soil are divided into horizontal layers, which are characterized by their specific leaf and root mass, respectively. In case of the soil, the thickness of the layers is derived from the soil profile of the site, whereas canopy layers are of equal thickness. The aboveground parts of the herbaceous vegetation are modeled as a separate layer of foliage beneath the canopy and share a number of initialized soil layers with the tree roots. Besides needles (separated in different age classes) and fine roots, the stand is assumed to consist of woody compartments (sapwood, heartwood, branches and coarse roots) and a pool of reserve carbohydrates, which provides assimilates for flushing and from which reproductive tissue is supplied.

II. Technical Information

II.1 Executables:

Operating System(s): DOS/Windows, Unix

II.2 Source-code:

Programming Language(s): Fortran 77

II.3 Manuals:

II.4 Data:

Only broadly available forest inventory data are required as initial stand variables. Concerning soil data, information about the profile is needed, which can be obtained from soil mappings or by taking standard soil properties for specific types of soil profiles. Nevertheless, if more detailed information about tree and soil properties are available they could be used to improve parameters and thus simulation for one specific site. Daily climate data are used as driving variables and nitrogen deposition as well as SO2 air concentrations can be used as optional inputs. Additionally, prescribed thinning proceedures can be selected if longer periods shall be simulated.

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

daily water, carbon and nitrogen balances annual water, carbon and nitrogen balances and stand development

IV. References

R.Grote, F.Suckow, 1998: Integrating dynamic morphological properties into forest growth modelling. I. Effects on water balance and gas exchange. For. Ecol. Manage. 112: 101-119

R.Grote 1998: Integrating dynamic morphological properties into forest growth modelling. II. Allocation and mortality. For. Ecol. Manage. 111: 193-210

R.Grote und M.Erhard, 1999: Simulation of tree and stand development under different environmental conditions with a physiologically based model. For. Ecol. Manage., in press.

V. Further information in the World-Wide-Web

VI. Additional remarks

FORSANA was developed within the framework of the project SANA ('Sanierung der Atmosphäre über den neuen Bundesländern'), which was launched in 1993 and supported by the federal ministry of science (BMBF, formerly BMFT). The daily processes were verified with field measurements from three sites, different in age and pollution history and the verification of stand development was done with inventory data of 75 stands within the target area 'Duebener Heide'. Finally, the model was used to simulate forest growth of more than 5000 actual pine stands for 35 years using different climate and air pollution scenarios. Since the end of the project in 1995/6 the model was applied also for general projections of forest growth under different climate change scenarios in Brandenburg/BRD.
Last review of this document by: Tue Dec 15 13:35:31 1998 Ruediger Grote
Status of the document: Contributed by Ruediger Grote
last modified by Tobias Gabele Wed Aug 21 21:44:43 CEST 2002

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