![]() ![]() Gammastar: Photorespiratory compensation point Γ*, This includes :Ĭa: Ambient CO2 expressed as partial pressure (Pa) Logical, defines whether verbose messages are printed.Ī named list of numeric values (including temperature and pressureĭependent parameters of the photosynthesis model, P-model predictions, Specifying which variables are to be returned (see return below). (Optional) A character string of vector of character strings Soil moisture stress factor is to be applied to down-scale light useĮfficiency (and only light use efficiency). (Optional) A logical specifying whether an empirical Temperature-dependence of quantum yield efficiency after Bernacchi et al.,Ģ003 is to be accounted for. Letters, and "none" for ignoring effects of Jmax limitation. Available isĪlso "smith19", following the method by Smith et al., 2019 Ecology Defaults to "wang17",īased on Wang Han et al. Is to be used for factoring in Jmax limitation. (Optional) A character string specifying which method Optimization criterium as used for "prentice14". Defaults to "prentice14".Īvailable also "prentice14_num" for a numerical solution to the same To be used for calculating optimal ci:ca. (Optional) A character string specifying which method is M (returned variable mj) tends to 1, and m' tends to The leaf-internal CO2 concentration is assumed to be very large and Photosynthetic pathway is followed.Defaults to FALSE. (Optional) A logical value specifying whether the C3 or C4 Defaults to 0.7330, the empirically fitted value as presented in (corresponding to a setup with method_jmaxlim="wang17",ĭo_ftemp_kphio=TRUE, do_soilmstress=TRUE).įunction. Defaults to 0.0, the empirically fitted value as presented in Parameter determining the sensitivity of the empirical soil moisture stressįunction. (Optional, used only if do_soilmstress=TRUE) (Optional, used only if do_soilmstress=TRUE) LocalĪnnual mean ratio of actual over potential evapotranspiration, measure for The sensitivity is determined by average aridity, defined by the localĪnnual mean ratio of actual over potential evapotranspiration, supplied by This information is used to calculateĪn empirical soil moisture stress factor (soilmstress) whereby Soil moisture as a fraction of field capacity (unitless). (Optional, used only if do_soilmstress=TRUE) Relative Defaults to 146.0 (see Stocker et al., 2019). Method_jmaxlim="wang17", do_ftemp_kphio=FALSE, do_soilmstress=FALSE,Ĭorresponding to the empirically fitted value as presented in Stocker et al. Defaults toĠ.081785 for method_jmaxlim="wang17", do_ftemp_kphio=TRUE,ĭo_soilmstress=FALSE, 0.087182 for method_jmaxlim="wang17",ĭo_ftemp_kphio=TRUE, do_soilmstress=TRUE, and 0.049977 for If argumentĪpparent quantum yield efficiency (unitless). Is used only forĬalculating atmospheric pressure (using standard atmosphere (101325 Pa),Ĭorrected for elevation (argument elv), using the function ![]() When provided, overridesĮlv, otherwise patm is calculated using standardĪtmosphere (101325 Pa), corrected for elevation (argument elv),Įlevation above sea-level (m.a.s.l.). Respective output variables are returned as per unit months.Ītmospheric pressure (Pa). If ppfd is provided in units of mol m-2 month-1, then Ppfd (per area and per time) determine the units of outputs Incident photosynthetic photon flux density (Optional) Fraction of absorbed photosynthetically active Temperature, relevant for photosynthesis (deg C) Rpmodel ( tc, vpd, co2, fapar, ppfd, patm = NA, elv = NA, kphio = ifelse ( do_ftemp_kphio, ifelse ( do_soilmstress, 0.087182, 0.081785 ), 0.049977 ), beta = 146, soilm = stopifnot ( ! do_soilmstress ), meanalpha = 1, apar_soilm = 0, bpar_soilm = 0.733, c4 = FALSE, method_optci = "prentice14", method_jmaxlim = "wang17", do_ftemp_kphio = TRUE, do_soilmstress = FALSE, returnvar = NULL, verbose = FALSE )
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