On the Ecology of Mountainous Forests in a Changing Climate: A ...

90 Chapter 3
ForClim-E
Abiotic environment
model
ForClim-P
Plant population
dynamics model
ForClim-S
Soil organic matter
dynamics model
kLat
kFC
kSlAsp
µ(T), µ(P)
σ(T), σ(P)
r
uWiT
uDD
uDrStr
uAET
uWiT
uDD
uDrStr
uAvN
uXL
uXL
uAET
uAvN
ForestBase
Site characteristics:
latitude (kLat)
soil field capacity (kFC)
slope & aspect (kSlAsp)
Climatic data:
monthly µ and σ of T & P
cross-correlation coefficients
(r) between T & P
Bioclimatic variables:
Winter temperature (uWiT)
Annual sum of degree-days (uDD)
Drought stress index (uDrStr)
Actual evapotranspiration (uAET)
Biotic data:
Annual production of six
types of litter (uXL)
Soil data:
Available nitrogen in the soil
(uAvN)
Fig. 3.13: Architecture of the FORCLIM model. The three submodels FORCLIM-E,
FORCLIM-P, and FORCLIM-S exchange data via the base module ForestBase, which
warrants that all the output variables have a well-defined value all the time.
FCPMon exports the procedures necessary for the monitoring of stem density distributions
(histograms) and tree ring chronologies, plus the animation of tree growth.
FCPFileIO contains routines that perform file input and output tasks, such as reading of
files with species parameters, writing of a matrix of limiting factors for tree establishment
and growth, and the reading and writing of the state vector of FORCLIM-P.
FCPGrFact: Calculation of the three species-specific growth factors (gDDGF, gSMGF,
gSNGF) and of total leaf area index, total biomass, and total tree number.
FCPDynamic: This module contains the equations describing tree establishment, growth
(except for three growth factors, cf. module FCPGrFact), mortality, and litter production.
Moreover, it also contains the update procedure of the state vector.
ForClimP: model declaration in ModelWorks; it contains the ModelWorks procedures for
model dynamics and maintains the user interface.