1. General Model Information

Name: Northeastern forest growth simulator

Acronym: JABOWA

Main medium: terrestrial
Main subject: forestry
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: forest succession, composition of species ,growth, mortality, gap model


Dr. Daniel B. Botkin
The Center for the Study Of the Environment
P. O. Box 30700 * Santa Barbara 93130

Phone: (805) 452-3988
Fax: (805) 569-9170
email: dbotkin@gmu.edu
Homepage: http://www.naturestudy.org/whois/botkin.htm


Botkin, D.B.


JABOWA is a simulation model of northern hardwood forest groth, in which changes in the state of the forest are a function of the present state and random components.
Tree species are defined by a few general characteristics:

relations between: range of soilmoisture conditions within which the species can grow, number of samplings which can enter the stand under shaded, open or very open conditions.

The abiotic environment and cut of trees are also considered. Direct competition among individuals is restricted to competition for light. The simulation refers to 10 x 10 m plots. For each plot year of simulation three major subroutines are called: subroutine GROW, which deterministically provides the annual growth increment for each tree; subroutine BIRTH, which stochastically adds new samplings; and subroutine KILL, which stochastically decides which trees die.

II. Technical Information

II.1 Executables:

Operating System(s):

II.2 Source-code:

Programming Language(s): FORTRAN IV

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

Botkin, D.B., J.F. Janak, and JR. Wallis. 1972.Some ecological consequences of a computer model of forest growth.
J. Ecol., 60: 849-872

Botkin, D.B., J.F. Janak, and JR. Wallis. 1972.Rationale, limitations and assumtions of a Northeastern Forest Growth Simulator.
IBM J. Research Development 16: 101-116

Dale, V.H, Doyle, T.W. and Shugart, H.H., (1985). A comparison of tree growth models.
Ecological Modelling, 29: 145-169.

Pacala, S.W., Canham, C.D., and Silander, J.A., JR. (1993).Forest models defined by field measurements: 1. The design of a northeastern forest simulator.
Can. J. For. Res. 23: 1980-1988.

Mills, A. V. (1993).Predicting forest growth and composition - a test of the JABOWA model using data from Earl Stephens' study in the Tom Swamp tract.
Senior Thesis, Hampshire College, Amherst, MA.

Botkin, D.B., 1993.Forest Dynamics: An Ecological Model, Oxford University Press.

Botkin, D.B., 1993. JABOWA-II: A Computer Model of Forest Growth, Oxford University Press, N.Y. (Software and manual)

V. Further information in the World-Wide-Web

VI. Additional remarks

From JABOWA another similar forest growth simulator FORET was derived, which has been adapted for modeling diverse forests of the southern United States.
Last review of this document by: Juergen Bierwirth 19.03.2001
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:45 CEST 2002

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