1. General Model Information
Name: Northeastern forest growth simulator
Main medium: terrestrial
Main subject: forestry
Organization level: ecosystem
Type of model: not specified
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
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:
- maximum age,
- maximum diameter,
- maximum hight,
range of soilmoisture conditions within which the species can grow,
number of samplings which can enter the stand under shaded, open or very open
- height and diameter,
- total leaf weight and diameter,
- rate of photosynthesis and available light,
- relative growth and a measure of climate,
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
Programming Language(s): FORTRAN IV
III. Mathematical Information
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