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PFT parameters
Michael Dietze edited this page Jul 11, 2016
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2 revisions
Defines a plant functional type. Generally there a multiple repeats of pft with different numbers.
| TAG | Values | Description |
|---|---|---|
| Num | integer | PFT number (REQUIRED) |
| name | string | PFT name |
| include_pft | 0/1 | Whether to use the pft |
| include_pft_ag | 0/1 | Whether to initiate on agricultural patches |
| lifeform | 0-2 | 0=tree, 1=grass/forb, 2=shrub |
| phenology | {0,1,2,3,4} | {evergreen, drought deciduous, cold deciduous, ?, ?} |
| photosyn_pathway | 3,4 | C3 (3) or C4 (4) |
| quantum_efficiency | (mol CO2)/(mol photons) | parameter in the Farqhuar model. With the exception of shade tolerant plants, this is almost always around 0.08. |
| Vm0 = Vcmax, T=15 C | umol CO2/m^2/s^1 |
Carboxylase rate constant (Wilson et al 2000). High variability. May be determined through any of the following in literature:
|
| Vm_low_temp | ºC | Photosynthesis begins to rapidly decline below this temperature. |
| Jm0 = Jmax, T=15 C | umol/m^2/s^1 | Maximum electron transport rate |
| dark_respiration_factor | dimensionless | coefficent for leaf respiration |
| cuticular_cond | umol/m^2/s^1 | leaf conductance when stomata fully closed non-standard units |
| stomatal_slope | dimensionless | slope of the relation between stomatal conductance and A [Leuning]. Related to the Ball-Berry parameter in literature. |
| SLA | m2leaf kg-1C | Specific leaf area. High sensitivity. Inverse of leaf mass per area (LMA), in literature. |
| leaf_width | m | Mean leaf width. Used only to calculate boundary layer conductance. Low sensitivity. |
| c2n_leaf | (kgC)/(kgN) | C:N ratio in leaves. Most often derived from N%, in literature. |
| c2n_root | (kgC)/(kgN) | C:N ratio in fine roots. Most often derived from N%, in literature. |
| c2n_stem | (kgC)/(kgN) | C:N stem wood |
| c2n_storage | (kgC)/(kgN) | C:N ratio of the storage pool. Most often derived from N%, in literature. |
| c2n_recruit | (kgC/kgN) | C:N ratio in recruits. Derived from tissue C:N's, allometries, and hgt_min. |
| f_labile | dimensionless; ranges between 0-1 | fraction of litter that is goes into the labile (fast) carbon pool |
| b1Bl | (kg leaf biomass)/plant/(cm^b2Bl) | Leaf biomass allometry coefficient |
| b2Bl | dimensionless | Leaf biomass allometry coefficient |
| b1Bs | (kg stem biomass)/plant/(cm^b2Bs) | Stem biomass allometry coefficient |
| b2Bs | dimensionless | Stem biomass allometry coefficient |
| b1Ht | m | Height allometry coefficient |
| b2Ht | 1/cm | Height allometry coefficient |
| rho | kg/m3 | wood density (note, if > 0 code will use tropical allometries by default) |
| q | (kg fine roots)/(kg leaves) | ratio of fine root to leaf biomass. Derived from individual root and leaf biomass estimates, in literature. In woody plants, fine roots are defined as any root under 2mm in diameter. In grasses, find root biomass is treated as equivalent to total root biomass. |
| qsw | (kg sapwood)/(kg leaf)/meter | sapwood allocation |
| {r,c}_fract | dimensionless | Fraction of storage to {seed,clonal} reproduction {note: clonal is not currently implemented.} |
| nonlocal_dispersal | dimensionless; ranges between 0-1 | Proportion of dispersal that is global |
| seed_rain | 1/m2 | Background seed rain |
| hgt_min | m | The minimum height of plants represented by ED. Conceptually, the minimum height needed to begin photosynthesis. |
| repro_min_h | m | Mimimum height for reproduction. Low sensitivity, with the exception of grasses. Defaults to 5m in trees and 1m in grasses. |
| leaf_turnover_rate | 1/yr | rate of leaf loss (temperature dependent, check growth_balive.f90 for details) |
| root_turnover_rate | 1/yr | rate of fine root loss (temperature dependent, check growth_balive.f90 for details) |
| storage_turnover_rate | 1/yr | rate of storage pool loss (not temperature dependent) |
| root_respiration_factor | umolCO2 (kg fine roots)-1 s-1 | rate of fine root respiration at reference soil temperature |
| growth_resp_factor | 0-1 | Proportion of daily carbon gain lost to growth respiration |
| mort1 | 1/year | Time scale at which low-carbon balance plants die |
| mort2 | dimensionless | Carbon balance ratio for which mortality rapidly increases |
| mort3 | 1/year | Density independent (background) mortality |
| plant_min_temp | ºC | Freezing mortality |
| seedling_mortality | dimensionless; ranges from 0-1 | proportion of seed that dies and goes to litter pool. |
| treefall_{gt,lt} | m | Survival rate when {above,below} treefall_hite_threshold during treefall disturbance |
| water_conductance | m-2 a-1 (kgC root)-1 | "Water availability factor" Sets a plant's supply of water |
| clumping | dimensionless; range is between 0-1. | Radiative transfer clumping factor |
| leaf_scatter_vis | dimensionless | scattering coefficient for visible radiation |
| diffuse_backscatter_vis | dimensionless | backscatter fraction of diffuse radiation |
| emis_v | dimensionless | leaf emissivity |
Parameters that apply to all PFT's equally
| Variable | Units | Description |
|---|---|---|
| c2n_slow | (kgC)/(kgN) | C:N soil slow carbon pool |
| c2n_structural | (kgC)/(kgN) | C:N soil structural carbon pool |
| l2n_stem | (kgC)/(kgN) | Lignin:N stem wood |
| C2B | (kg carbon)/(kg biomass) | Carbon to Biomass ratio in wood |
| agf_bs | dimensionless; allowed range is 0-1. | Above-ground fraction of the structural stem |
| frost_mort | 1/years | frost mortality rate |