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The reference models - Methods and material - iLand model complexity and its niche in the landscape of models

Tables 7-11 (functional complexity)

Table 7: Ecophysiology – primary production

modelprocess descriptionrelative complexity scoring
SORTIEempirical growth equation for diameter increment based on individual diameter and light avialability1
KiWiempirical maximum diameter growth equation reduced by competition and enviornmental effects1
ForClimempirical maximum diameter increment rate reduced by environmental modifiers1
3-PGprocess-based radiation use efficiency approach at stand level, constant respiration fraction, reduction of potential production by environmental modifiers3
BiomeBGCFarquhar model, autotrophic respiration (maintanance and growth components) 5
LANDISnot modelled1
EDFarquhar model, autotrophic respiration proportional to maximum ratio of carboxylation5
FireBGCFarquhar model, autotrophic respiration (maintanance and growth components) 5
LANDIS IIprocess-based (PnET-II, currently external, algorithms being implemented into LANDIS II): leaf level photosynthesis, growth and maintanance respiration4
PICUSprocess-based radiation use efficiency approach at stand level, constant respiration fraction, reduction of potential production by environmental modifiers3


Table 8: Ecophysiology – allocation

modelprocess descriptionrelative complexity scoring
SORTIEempirical growth equation for diameter increment based on individual diameter and light avialability1
KiWiempirical maximum diameter growth equation reduced by cometition effect and salinity1
ForClimempirical maximum diameter increment rate reduced by environmental modifiers1
3-PGfunctional balance, parameterized with empirical allometric equations3
BiomeBGCdynamic allocation, balancing constant C:N stoichiometry of pools5
LANDISnot modelled1
EDfunctional balance, parameterized with empirical allometric equations, pipe model theory for sapwood3
FireBGCdynamic allocation, balancing constant C:N stoichiometry of pools5
LANDIS IIhierachical, buds-foliage, fine roots, plant reserves pool, wood (PnET)4
PICUSfunctional balance, parameterized with empirical allometric equations3


Table 9: Ecophysiology – element cycling

modelprocess descriptionrelative complexity scoring
SORTIEaboveground biomass1
KiWiaboveground biomass1
ForClimaboveground biomass1
3-PGaboveground biomass1
BiomeBGCclosed C, N, water and energy cycles5
LANDISnot modelled1
EDclosed C, N and water cycle5
FireBGCclosed C, N, and water cycles5
LANDIS IIclosed C, N and water cycles (with integrated PnET and Century extension)5
PICUSclosed C, N, and water cycles5


Table 10: Ecophysiology – atmospheric processes

modelprocess descriptionrelative complexity scoring
SORTIElight only1
KiWilight only1
ForClimsummer temperature (degree day index), drought (transpiration deficit)3
3-PGtemperature, frost, vapor pressure deficit, radiation4
BiomeBGCtemperature, precipitation, VPD, PAR, CO2, O35
LANDISnot directly modelled1
EDtemperature, VPD, PAR4.5
FireBGCtemperature, precipitation, PAR, CO2, O35
LANDIS IIPnET-II: temperature, PAR, VPD4.5
PICUStemperature (both daily GPP optimum and annual GDD), frost, vapor pressure deficit, soil moisture (actual to potential transpiration), PAR4


Table 11: Ecophysiology – belowground processes

modelprocess descriptionrelative complexity scoring
SORTIEnone1
KiWinone1
ForClimnitrogen availability, soil moisture2.5
3-PGaggregated fertility rating, soil moisture2
BiomeBGCdynamic soil litter and SOM pools5
LANDISnot directly modelled1
EDdynamic soil model of C and N cycling (Century), one layer bucket model for soil water5
FireBGCdynamic soil litter and SOM pools5
LANDIS IIdynamic soil model of C and N cycling (Century extension), one layer bucket model for soil water5
PICUSdynamic soil model of C and N cycling, one layer bucket model for soil water, response function for pH value5

Created by rupert. Last Modification: Monday 31 of May, 2010 02:56:02 CEST by rupert.