name: FAOSoilTypeEnum
description: FAO World Reference Base (WRB) soil classification codes used in HWSD2.
This enum is adapted from the LinkML valuesets FAO soil valueset, but uses the 2-character
HWSD/WRB symbols as permissible values so it can type the existing `wrb2` field
directly.
from_schema: https://w3id.org/bioepic-data/fao-soils/hwsd2
see_also:
- https://github.com/linkml/valuesets/pull/26
- https://raw.githubusercontent.com/linkml/valuesets/main/src/valuesets/schema/earth_science/fao_soil.yaml
- https://www.fao.org/soils-portal/data-hub/soil-classification/world-reference-base/en/
- https://www.isric.org/explore/hwsd
rank: 1000
permissible_values:
AC:
text: AC
description: Acrisols - soils with subsurface accumulation of low-activity clays
and low base saturation
annotations:
soil_name:
tag: soil_name
value: Acrisols
fao_id:
tag: fao_id
value: 1
color_rgb:
tag: color_rgb
value: 247,152,4
AL:
text: AL
description: Alisols - soils with high aluminium saturation and low base saturation
annotations:
soil_name:
tag: soil_name
value: Alisols
fao_id:
tag: fao_id
value: 2
color_rgb:
tag: color_rgb
value: 255,255,190
AN:
text: AN
description: Andosols - soils developed from volcanic ash with unique physical
and chemical properties
meaning: ENVO:00002232
annotations:
soil_name:
tag: soil_name
value: Andosols
fao_id:
tag: fao_id
value: 3
color_rgb:
tag: color_rgb
value: 254,0,0
AR:
text: AR
description: Arenosols - sandy soils with weak horizon development
meaning: ENVO:00002229
annotations:
soil_name:
tag: soil_name
value: Arenosols
fao_id:
tag: fao_id
value: 4
color_rgb:
tag: color_rgb
value: 245,212,161
AT:
text: AT
description: Anthrosols - soils strongly modified by human activities
annotations:
soil_name:
tag: soil_name
value: Anthrosols
fao_id:
tag: fao_id
value: 5
color_rgb:
tag: color_rgb
value: 207,152,4
CH:
text: CH
description: Chernozems - very dark, fertile soils with thick mollic horizon
annotations:
soil_name:
tag: soil_name
value: Chernozems
fao_id:
tag: fao_id
value: 6
color_rgb:
tag: color_rgb
value: 145,77,53
CL:
text: CL
description: Calcisols - soils with secondary calcium carbonate accumulation
annotations:
soil_name:
tag: soil_name
value: Calcisols
fao_id:
tag: fao_id
value: 7
color_rgb:
tag: color_rgb
value: 254,244,0
CM:
text: CM
description: Cambisols - soils with beginning of horizon differentiation
annotations:
soil_name:
tag: soil_name
value: Cambisols
fao_id:
tag: fao_id
value: 8
color_rgb:
tag: color_rgb
value: 254,190,0
CR:
text: CR
description: Cryosols - soils formed under permafrost conditions
meaning: ENVO:00002236
annotations:
soil_name:
tag: soil_name
value: Cryosols
fao_id:
tag: fao_id
value: 9
color_rgb:
tag: color_rgb
value: 75,61,172
FL:
text: FL
description: Fluvisols - soils developed from recent alluvial deposits
meaning: ENVO:00002273
annotations:
soil_name:
tag: soil_name
value: Fluvisols
fao_id:
tag: fao_id
value: 10
color_rgb:
tag: color_rgb
value: 0,254,253
FR:
text: FR
description: Ferralsols - highly weathered soils with low-activity clay minerals
annotations:
soil_name:
tag: soil_name
value: Ferralsols
fao_id:
tag: fao_id
value: 11
color_rgb:
tag: color_rgb
value: 255,135,33
GG:
text: GG
description: Glaciers - areas covered by permanent ice (non-soil land cover category
carried in HWSD2)
meaning: ENVO:00000133
annotations:
soil_name:
tag: soil_name
value: Glaciers
fao_id:
tag: fao_id
value: 12
color_rgb:
tag: color_rgb
value: 212,212,212
GL:
text: GL
description: Gleysols - soils with permanent or temporary waterlogging
meaning: ENVO:00002244
annotations:
soil_name:
tag: soil_name
value: Gleysols
fao_id:
tag: fao_id
value: 13
color_rgb:
tag: color_rgb
value: 128,131,217
GY:
text: GY
description: Gypsisols - soils with secondary gypsum accumulation
annotations:
soil_name:
tag: soil_name
value: Gypsisols
fao_id:
tag: fao_id
value: 14
color_rgb:
tag: color_rgb
value: 254,246,164
HS:
text: HS
description: Histosols - soils formed from organic materials (peat soils)
meaning: ENVO:00005774
annotations:
soil_name:
tag: soil_name
value: Histosols
fao_id:
tag: fao_id
value: 15
color_rgb:
tag: color_rgb
value: 112,107,102
KS:
text: KS
description: Kastanozems - soils with chestnut-colored mollic horizon
annotations:
soil_name:
tag: soil_name
value: Kastanozems
fao_id:
tag: fao_id
value: 17
color_rgb:
tag: color_rgb
value: 202,147,127
LP:
text: LP
description: Leptosols - shallow soils over hard rock or highly calcareous material
annotations:
soil_name:
tag: soil_name
value: Leptosols
fao_id:
tag: fao_id
value: 18
color_rgb:
tag: color_rgb
value: 209,209,209
LV:
text: LV
description: Luvisols - soils with clay illuviation and high base saturation
annotations:
soil_name:
tag: soil_name
value: Luvisols
fao_id:
tag: fao_id
value: 19
color_rgb:
tag: color_rgb
value: 250,132,132
LX:
text: LX
description: Lixisols - soils with clay illuviation and low base saturation
annotations:
soil_name:
tag: soil_name
value: Lixisols
fao_id:
tag: fao_id
value: 20
color_rgb:
tag: color_rgb
value: 255,190,190
NT:
text: NT
description: Nitisols - soils with deep, well-structured clay horizons
annotations:
soil_name:
tag: soil_name
value: Nitisols
fao_id:
tag: fao_id
value: 21
color_rgb:
tag: color_rgb
value: 255,167,127
PH:
text: PH
description: Phaeozems - soils with dark mollic horizon and high base saturation
annotations:
soil_name:
tag: soil_name
value: Phaeozems
fao_id:
tag: fao_id
value: 22
color_rgb:
tag: color_rgb
value: 189,100,70
PL:
text: PL
description: Planosols - soils with abrupt textural change and impermeable subsoil
annotations:
soil_name:
tag: soil_name
value: Planosols
fao_id:
tag: fao_id
value: 23
color_rgb:
tag: color_rgb
value: 247,125,58
PT:
text: PT
description: Plinthosols - soils with iron-rich, humus-poor mixture that hardens
irreversibly
annotations:
soil_name:
tag: soil_name
value: Plinthosols
fao_id:
tag: fao_id
value: 24
color_rgb:
tag: color_rgb
value: 115,0,0
PZ:
text: PZ
description: Podzols - soils with subsurface accumulation of aluminium and iron
complexes with organic matter (spodic horizon)
annotations:
soil_name:
tag: soil_name
value: Podzols
fao_id:
tag: fao_id
value: 25
color_rgb:
tag: color_rgb
value: 12,217,0
RG:
text: RG
description: Regosols - weakly developed soils without significant horizon differentiation
annotations:
soil_name:
tag: soil_name
value: Regosols
fao_id:
tag: fao_id
value: 26
color_rgb:
tag: color_rgb
value: 254,227,164
RT:
text: RT
description: Retisols - soils with clay migration and tonguing of overlying material
annotations:
soil_name:
tag: soil_name
value: Retisols
fao_id:
tag: fao_id
value: 27
color_rgb:
tag: color_rgb
value: 254,194,194
SC:
text: SC
description: Solonchaks - soils with high salt content
meaning: ENVO:00002252
annotations:
soil_name:
tag: soil_name
value: Solonchaks
fao_id:
tag: fao_id
value: 28
color_rgb:
tag: color_rgb
value: 254,0,250
SN:
text: SN
description: Solonetz - soils with high exchangeable sodium content
annotations:
soil_name:
tag: soil_name
value: Solonetz
fao_id:
tag: fao_id
value: 29
color_rgb:
tag: color_rgb
value: 249,194,254
ST:
text: ST
description: Stagnosols - soils with seasonal waterlogging in upper horizons
annotations:
soil_name:
tag: soil_name
value: Stagnosols
fao_id:
tag: fao_id
value: 30
color_rgb:
tag: color_rgb
value: 64,192,233
TC:
text: TC
description: Technosols - soils containing significant amounts of technical artifacts
annotations:
soil_name:
tag: soil_name
value: Technosols
fao_id:
tag: fao_id
value: 31
color_rgb:
tag: color_rgb
value: 145,0,157
UM:
text: UM
description: Umbrisols - soils with dark acidic surface horizon
annotations:
soil_name:
tag: soil_name
value: Umbrisols
fao_id:
tag: fao_id
value: 32
color_rgb:
tag: color_rgb
value: 115,142,127
VR:
text: VR
description: Vertisols - clay-rich soils with shrink-swell properties
meaning: ENVO:00002254
annotations:
soil_name:
tag: soil_name
value: Vertisols
fao_id:
tag: fao_id
value: 33
color_rgb:
tag: color_rgb
value: 197,0,255
WR:
text: WR
description: Open inland water - areas covered by permanent water bodies (non-soil
land cover category carried in HWSD2)
meaning: ENVO:01001320
annotations:
soil_name:
tag: soil_name
value: Open inland water
fao_id:
tag: fao_id
value: 34
color_rgb:
tag: color_rgb
value: 0,0,255
ND:
text: ND
description: No data - areas where soil data is not available
annotations:
soil_name:
tag: soil_name
value: No data
fao_id:
tag: fao_id
value: 35
color_rgb:
tag: color_rgb
value: 255,255,255