Table 7: Ecophysiology – primary production

model	process description	relative complexity scoring
SORTIE	empirical growth equation for diameter increment based on individual diameter and light avialability	1
KiWi	empirical maximum diameter growth equation reduced by competition and enviornmental effects	1
ForClim	empirical maximum diameter increment rate reduced by environmental modifiers	1
3-PG	process-based radiation use efficiency approach at stand level, constant respiration fraction, reduction of potential production by environmental modifiers	3
BiomeBGC	Farquhar model, autotrophic respiration (maintanance and growth components)	5
LANDIS	not modelled	1
ED	Farquhar model, autotrophic respiration proportional to maximum ratio of carboxylation	5
FireBGC	Farquhar model, autotrophic respiration (maintanance and growth components)	5
LANDIS II	process-based (PnET-II, currently external, algorithms being implemented into LANDIS II): leaf level photosynthesis, growth and maintanance respiration	4
PICUS	process-based radiation use efficiency approach at stand level, constant respiration fraction, reduction of potential production by environmental modifiers	3

Table 8: Ecophysiology – allocation

model	process description	relative complexity scoring
SORTIE	empirical growth equation for diameter increment based on individual diameter and light avialability	1
KiWi	empirical maximum diameter growth equation reduced by cometition effect and salinity	1
ForClim	empirical maximum diameter increment rate reduced by environmental modifiers	1
3-PG	functional balance, parameterized with empirical allometric equations	3
BiomeBGC	dynamic allocation, balancing constant C:N stoichiometry of pools	5
LANDIS	not modelled	1
ED	functional balance, parameterized with empirical allometric equations, pipe model theory for sapwood	3
FireBGC	dynamic allocation, balancing constant C:N stoichiometry of pools	5
LANDIS II	hierachical, buds-foliage, fine roots, plant reserves pool, wood (PnET)	4
PICUS	functional balance, parameterized with empirical allometric equations	3

Table 9: Ecophysiology – element cycling

model	process description	relative complexity scoring
SORTIE	aboveground biomass	1
KiWi	aboveground biomass	1
ForClim	aboveground biomass	1
3-PG	aboveground biomass	1
BiomeBGC	closed C, N, water and energy cycles	5
LANDIS	not modelled	1
ED	closed C, N and water cycle	5
FireBGC	closed C, N, and water cycles	5
LANDIS II	closed C, N and water cycles (with integrated PnET and Century extension)	5
PICUS	closed C, N, and water cycles	5

Table 10: Ecophysiology – atmospheric processes

model	process description	relative complexity scoring
SORTIE	light only	1
KiWi	light only	1
ForClim	summer temperature (degree day index), drought (transpiration deficit)	3
3-PG	temperature, frost, vapor pressure deficit, radiation	4
BiomeBGC	temperature, precipitation, VPD, PAR, CO2, O3	5
LANDIS	not directly modelled	1
ED	temperature, VPD, PAR	4.5
FireBGC	temperature, precipitation, PAR, CO2, O3	5
LANDIS II	PnET-II: temperature, PAR, VPD	4.5
PICUS	temperature (both daily GPP optimum and annual GDD), frost, vapor pressure deficit, soil moisture (actual to potential transpiration), PAR	4

Table 11: Ecophysiology – belowground processes

model	process description	relative complexity scoring
SORTIE	none	1
KiWi	none	1
ForClim	nitrogen availability, soil moisture	2.5
3-PG	aggregated fertility rating, soil moisture	2
BiomeBGC	dynamic soil litter and SOM pools	5
LANDIS	not directly modelled	1
ED	dynamic soil model of C and N cycling (Century), one layer bucket model for soil water	5
FireBGC	dynamic soil litter and SOM pools	5
LANDIS II	dynamic soil model of C and N cycling (Century extension), one layer bucket model for soil water	5
PICUS	dynamic soil model of C and N cycling, one layer bucket model for soil water, response function for pH value	5