VIC Classic——Vegetation Library File

veg_class

N/A

1

Vegetation class identification number (reference index for library table)

overstory

N/A

1

Flag to indicate whether or not the current vegetation type has an overstory (TRUE for overstory present [e.g. trees], FALSE for overstory not present [e.g. grass])

rarc

s/m

1

Architectural resistance of vegetation type (~2 s/m)

rmin

s/m

1

Minimum stomatal resistance of vegetation type (~100 s/m)

LAI

fraction

12

Leaf-area index of vegetation type

FCANOPY (Only present if VEGLIB_FCAN=TRUE in global parameter file

fraction

12

Partial vegetation cover fraction

albedo

fraction

12

Shortwave albedo for vegetation type

rough

m

12

Vegetation roughness length (typically 0.123 * vegetation height)

displacement

m

12

Vegetation displacement height (typically 0.67 * vegetation height)

wind_h

m

1

Height at which wind speed is measured. If using snow interception routines please read the documentation on wind_h.

RGL

W/m2

1

Minimum incoming shortwave radiation at which there will be transpiration. For trees this is about 30 W/m2, for crops about 100 W/m2.

rad_atten

fract

1

Radiation attenuation factor. Normally set to 0.5, though may need to be adjusted for high latitudes.

wind_atten

fract

1

Wind speed attenuation through the overstory. The default value has been 0.5.

trunk_ratio

fract

1

Ratio of total tree height that is trunk (no branches). The default value has been 0.2.

Ctype (Only present if VEGLIB_PHOTO=TRUE in global parameter file

0 or 1 (0 = C3, 1 = C4)

1

Photosynthetic pathway (NOTE: the previous input values of "C3" and "C4" are still accepted but are deprecated.

MaxCarboxRate (Only present if VEGLIB_PHOTO=TRUE in global parameter file

mol CO2/m2s

1

Maximum carboxlyation rate at 25 deg C

MaxETransport (C3) or CO2Specificity (C4) (Only present if VEGLIB_PHOTO=TRUE in global parameter file

mol CO2/m2s

1

Maximum electron transport rate at 25 deg C (C3) or CO2 specificity at 25 deg C (C4)

LightUseEff (Only present if VEGLIB_PHOTO=TRUE in global parameter file

mol CO2/mol photons

1

Light-use efficiency

NscaleFlag (Only present if VEGLIB_PHOTO=TRUE in global parameter file

0 or 1

1

1 = nitrogen-scaling factors are applicable to this veg class

Wnpp_inhib (Only present if VEGLIB_PHOTO=TRUE in global parameter file

fract

1

Fraction of maximum moisture storage in top soil layer above which photosynthesis begins to be inhibited by wet conditions

NPPfactor_sat (Only present if VEGLIB_PHOTO=TRUE in global parameter file

fract

1

Ratio of NPP under saturated conditions (moisture fraction = 1.0) to NPP at moisture fraction = Wnpp_inhib

comment

N/A

1

Comment block for vegetation type. Model skips end of line so spaces are valid entries.