Deciduous Trees

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4.3.10. Deciduous Trees#

Properties for deciduous trees and shrubs.

Deciduous vegetation undergoes seasonal changes with leaf growth and fall, significantly affecting surface energy balance throughout the year. These surfaces provide seasonal shading and have variable evapotranspiration rates.

Parameters:

sfr#

Surface fraction of grid area covered by this surface type

Unit:

dimensionless

Example:

0.14285714285714285

emis#

Surface emissivity for longwave radiation

Unit:

dimensionless

Example:

0.95

ohm_threshsw#

Summer/winter threshold based on temperature for OHM calculation

Unit:

degC

Example:

0.0

ohm_threshwd#

Soil moisture threshold determining whether wet/dry OHM coefficients are applied

Unit:

dimensionless

Example:

0.0

ohm_coef#

The ohm_coef parameter group is defined by the Seasonal/Wetness OHM Coefficients structure.

soildepth#

Depth of soil layer for hydrological calculations

Unit:

mm

Default:

None (optional)

soilstorecap#

Maximum water storage capacity of soil

Unit:

mm

Default:

None (optional)

statelimit#

Minimum water storage capacity for state change

Unit:

mm

Example:

10.0

wetthresh#

Surface wetness threshold for OHM calculations

Unit:

dimensionless

Example:

0.5

sathydraulicconduct#

Saturated hydraulic conductivity of soil

Unit:

mm s-1

Default:

None (optional)

waterdist#

Water distribution for deciduous trees

The waterdist parameter group is defined by the Water Distribution structure.

storedrainprm#

Storage and drain parameters

The storedrainprm parameter group is defined by the Drainage Parameters structure.

snowpacklimit#

Limit of snow that can be held on surface

Unit:

mm

Example:

10.0

thermal_layers#

Thermal layers for the surface

The thermal_layers parameter group is defined by the Thermal Layers structure.

irrfrac#

Fraction of surface area that can be irrigated

Unit:

dimensionless

Example:

0.0

ref#

The ref parameter group is defined by the Reference Info structure.

alb#

Albedo

Unit:

dimensionless

Example:

0.2

alb_min#

Minimum albedo

Unit:

dimensionless

Example:

0.2

alb_max#

Maximum albedo

Unit:

dimensionless

Example:

0.3

beta_bioco2#

Biogenic CO2 exchange coefficient

Unit:

dimensionless

Default:

None (optional)

beta_enh_bioco2#

Enhanced biogenic CO2 exchange coefficient

Unit:

dimensionless

Example:

0.7

alpha_bioco2#

Biogenic CO2 exchange coefficient

Unit:

dimensionless

Default:

None (optional)

alpha_enh_bioco2#

Enhanced biogenic CO2 exchange coefficient

Unit:

dimensionless

Example:

0.9

resp_a#

Respiration coefficient

Unit:

umol m-2 s-1

Default:

None (optional)

resp_b#

Respiration coefficient

Unit:

dimensionless

Default:

None (optional)

theta_bioco2#

Biogenic CO2 exchange coefficient

Unit:

dimensionless

Default:

None (optional)

maxconductance#

Maximum surface conductance

Unit:

mm s-1

Example:

0.5

min_res_bioco2#

Minimum respiratory biogenic CO2

Unit:

umol m-2 s-1

Example:

0.1

lai#

Leaf area index parameters

The lai parameter group is defined by the LAI structure.

ie_a#

Irrigation efficiency coefficient-automatic

Unit:

dimensionless

Example:

0.5

ie_m#

Irrigation efficiency coefficient-manual

Unit:

dimensionless

Example:

0.6

faidectree#

Frontal area index of deciduous trees

Unit:

dimensionless

Default:

None (optional)

dectreeh#

Deciduous tree height

Unit:

m

Default:

None (optional)

pormin_dec#

Minimum porosity

Unit:

dimensionless

Example:

0.2

pormax_dec#

Maximum porosity

Unit:

dimensionless

Example:

0.6

capmax_dec#

Maximum water capacity

Unit:

mm

Example:

100.0

capmin_dec#

Minimum water capacity

Unit:

mm

Example:

10.0