Tables 2-6 (structural complexity)

Table 2: Population dynamics - structure

model	process description	relative complexity scoring
SORTIE	spatially explicit (coordinates), individual-based, 3D structure (crown geometry) and individual competition for light, GLI (seasonally aggregated measure of photosynthetically active available radiation at the top of every crown)	5
KiWi	spatially explicit (coordinates), field of neighborhood defines individuals competitve influence on others, additive competitive influence for an individual is averaged over zone of influence	4
ForClim	gap model structure, individual-based, within patch horizontally non-explicit, beer-lambert law for light availability of trees on patch	4
3-PG	mean tree approach	2
BiomeBGC	big leaf approach	1
LANDIS	species-age cohorts	1.5
ED	ecosystem demography approach, 15x15m patch structure of independent patches, within patch horizontally non-explicit, size- and age structured approximation of the first moment of the stochastic gap model with partial differential equations	4
FireBGC	individual tree succession model, individual trees simulated at plot level, competition at stand level, biogeochemistry at stand level	4
LANDIS-II	species-age-biomass cohorts, competition via biomass-related growing space estimation	2.5
PICUS	3D gap model, individual-based, explicit horizontal and vertical spatial interactions between patches with regard to light availability (5m crown cells), homogeneous foliage biomass distribution within tree crown	4.5

Table 3: Population dynamics - composition

model	process description	relative complexity scoring
SORTIE	multiple tree species, parameterized for central eastern US, Canada, other temperate, boreal and tropical forest regions	5
KiWi	multiple tree species, parameterized for Mangrove ecosystems	5
ForClim	multiple tree species, parameterized for central Europe, PNW	5
3-PG	evenaged, monospecies stands, parameterized for different parts of the world	1
BiomeBGC	not modeled explicitly; species parameters for different biomes	1
LANDIS	multiple tree species, parameterized for central eastern US, Canada, other temperate and boreal forest regions	5
ED	plant-functional types, different temperate and tropical ecosystems	3
FireBGC	multiple tree species, parameterized for western US	5
LANDIS II	multiple tree species, parameterized for central eastern US, Canada, other temperate and boreal forest regions	5
PICUS	multiple tree species, parameterized for central Europe	5

Table 4: Population dynamics - regeneration

model	process description	relative complexity scoring
SORTIE	seedling establishment probability based on distance from maternal tree	4
KiWi	depending on the competitive strength (field of neighborhood) from other individuals	4
ForClim	recruitment (dbh=1.27), depending on light availability on the forest floor, browsing and winter minimum temperature	4
3-PG	not modelled	1
BiomeBGC	not modelled explicitly	1
LANDIS	spatially explicit dispersal, establishment rate based on land-type related probability	2
ED	random dispersal, recruitment model	3.5
FireBGC	spatially explicit dispersal, recruitment model with temperature and drought index as thresholds, depending on seed availability	4
LANDIS II	spatially explicit dispersal, establishment rate based on light availability (biomass), establishment probability (land type)	2.5
PICUS	seed production and distribution, germination, cohort regeneration model, recruitment into the individual-based model structure, influenced by light level on forest floor as well as climate and soil factors	5

Table 5: Population dynamics - mortality

model	process description	relative complexity scoring
SORTIE	growth related (function of growth rate of the last 5 years), random component	4.5
KiWi	stress-realted mortality based on diameter increment	4
ForClim	age- and stress-related mortality components	4
3-PG	-3/2 power law	2
BiomeBGC	not modelled explicitly	1
LANDIS	age effect	1.5
ED	age- and carbon balance driven components	3.5
FireBGC	random and stress (diameter increment) related components	4
LANDIS II	competition-related crowding effect, age effect	2.5
PICUS	age- and stress-related mortality components, age-related mortality variable with site quality	5

Table 6: Population dynamics - management

model	process description	relative complexity scoring
SORTIE	no management	1
KiWi	no management	1
ForClim	no management	1
3-PG	reduction of stem number / leaf area	2
BiomeBGC	removal of biomass from ecosystem pools	2
LANDIS	species-age cohort	1.5
ED	no management	1
FireBGC	no management	1
LANDIS II	species-age-biomass cohort, bottom up or top down removal of cohorts	2.5
PICUS	prescriptive on individual tree level, spatially explicit, implementation of adaptive management through script engine	5