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

254 Appendix
kG parameter:
The kG parameters of FORENA were recalculated according to Eq. A-1 (Appendix II) to
conform to the requirements of the maximum growth equation according to Moore
(1989).
kDDMin and kDDMax parameters:
Both parameters were calculated based on the regression equation given in Fig. A-2.
kWiT parameter:
The calculation of the kWiT parameter is given in Eq. A-3 (cf. Appendix II).
kWiT FORCLIM = kWiT FORENA – 1
(A-3)
kNTol parameter:
The kNTol parameter of FORCLIM was derived from the CM1 parameter in the
LINKAGES model (Pastor & Post 1985), which describes the nitrogen response function
of the tree species (Eq. A-4):
kNTol s =
1 CM1 = 2.79
2 CM1 = 2.94
3 CM1 = 2.99
(A-4)
kBrow parameter:
The kBrow parameter was determined based on the boolean variable SWITCH4 in
FORENA, which determines the susceptibility of the tree species to browsing (Eq. A-5):
kBrow s =
1 SWITCH4 = FALSE
3 SWITCH4 = TRUE
(A-5)
kL y and kL a parameters:
The light requirement parameters were determined from the two light tolerance classes
distinguished in FORENA (Eq. A-6). It should be noted that no differentiation between
saplings and older trees was possible due to the lack of data in FORENA.
kL y,s = kL a,s =
3 ITOL = 1
7 ITOL = 2
(A-6)
kLQ parameter:
The kLQ parameter was assigned by mapping the 12 leaf litter classes distinguished in the
LINKAGES model by Pastor & Post (1985, p. 34, parameter TL) to the three types of leaf
litter distinguished in FORCLIM (Eq. A-7):
kLQ s =
1 1 ≤ TL ≤ 4
2 5 ≤ TL ≤ 9
3 10 ≤ TL ≤ 12
(A-7)
Tab. A-21 gives an overview of the values of the 14 species parameters for each of the
72 eastern North American tree species.