Reference soil Côte d'Ivoire 2: Acrisol

CI002

PARENT ROCK: Hard migmatite, rich in biotite; Precambrian Basement System. ADDITIONAL NOTES ON PROFILE DESCRIPTION: O - 2 to 3 leaves thick (rapidly decomposing). Ahcs - nodules: with black patina. Bcs1 - color interior concretions: 5YR3/2; nodules: with black patina. Bcs2 - nodules: with black patina. 2Bws - color interior concretions: 2.5YR4/6. Gravel: iron concretions up to 5cm in diameter, irregular.

WRB 2006:

WRB 1998:

Pisoplinthic Vetic Acrisol

(Hyperdystric Profondic Clayic)

Veti- Pisoplinthic Acrisol

(Profondic Hyperdystric)

0-70 cm pisoplinthic horizon
10-150 cm argic horizon
40-150 cm ferralic horizon

FAO-UNESCO-ISRIC 1988:

FAO-UNESCO 1974:

Veti-

Ferric Acrisol

skeletic phase

Ferric Acrisol

petric phase

0-10 cm ochric A horizon
10-150 cm argic B horizon
40-150 cm ferralic B horizon
ferric properties

0-10 cm ochric A horizon
10-150 cm argillic B horizon
40-150 cm oxic B horizon
ferric properties

Location:

Tai Forest Reserve, parcelle Fred vooren, midslope

Study of the iron forms occurring in the soils of a typical migmatite catena in the Taï region, south-west Côte d'Ivoire. PDF /

Carte de la Végétation de la Côte d'Ivoire. Feuille Sud-Ouest map

Physical

Depth (cm)		Gravel (%)	Very Coarse Sand (%)	Coarse Sand (%)	Medium Sand (%)	Fine Sand (%)	Very Fine Sand (%)	Total Sand (%)	Coarse Silt (%)	Fine Silt (%)	Total Silt (%)	Clay (%)
0-10	:	75	8.5	3.4	17.2	27.0	12.4	68.5	8.9	5.2	14.1	17.0
10-30	:	71	12.1	4.2	10.0	21.3	10.1	57.7	9.0	4.7	13.7	28.6
40-70	:	63	6.8	2.8	6.0	10.3	5.8	31.7	9.3	6.0	15.3	52.8
80-100	:	5	3.8	3.0	5.0	9.1	5.5	26.4	12.2	15.6	27.8	45.8
110-150	:	2	2.0	1.5	4.1	8.5	5.0	21.1	13.0	17.2	30.2	48.7

Water retention characteristics

Depth (cm)		Bulk Density (kg/dm³)	pF 0 (% w/v)	pF 1.0 (% w/v)	pF 1.5 (% w/v)	pF 2.0 (% w/v)	pF 2.3 (% w/v)	pF 2.7 (% w/v)	pF 3.4 (% w/v)	pF 4.2 (% w/v)	pF 2.5 (%)
80-100	:	1.49	45.2	43.7	40.7	37.7	36.4	34.9	32.1	30.2	-

Other physical data

Depth (cm)		Bulk Density (kg/dm³)	Spec. Surf. Area (m2/g)	COLE (cm/cm)	Water Disp. Clay (%)	Clay (%)
0-10	:	-	-	-	2.4	17.0
10-30	:	-	-	-	13.4	28.6
40-70	:	-	-	-	0.5	52.8
80-100	:	-	-	-	0.5	45.8
110-150	:	-	-	-	0.0	48.7

Chemical characteristics:

Depth (cm)		pH H2O	pH KCl	EC 1 : 2.5 (mS/cm)	CaCO3 (%)	Org. C (%)	Org. N (%)	C / N	Exch. Acid (cmol/kg)	Exch. Al (cmol/kg)	Ca (cmol/kg)	Mg (cmol/kg)	K (cmol/kg)	Na (cmol/kg)	Sum Cations (cmol/kg)
0-10	:	5.6	4.2	0.14	-	3.45	0.22	16	0.4	0.2	3.3	1.3	0.2	0.3	5.1
10-30	:	4.7	3.8	0.06	-	1.08	0.09	12	1.4	1.1	0.2	0.3	0.1	0.2	0.8
40-70	:	4.6	3.8	0.03	-	0.79	0.06	13	2.0	1.8	0.0	0.1	0.0	0.2	0.3
80-100	:	4.6	3.8	0.03	-	0.43	0.04	11	2.1	1.8	0.0	0.1	0.0	0.2	0.3
110-150	:	4.5	3.7	0.03	-	0.22	-	-	2.3	1.8	0.0	0.1	0.0	0.1	0.2

Depth (cm)		CEC Soil (cmol/kg)	CEC Clay (cmol/kg)	CEC Org (cmol/kg)	ECEC (cmol/kg)	Base sat. (%)	Al sat. (%)	ESP (%)
0-10	:	9.6	-	12.1	-	53	-	3
10-30	:	5.4	-	3.8	-	15	-	-
40-70	:	5.1	-	2.8	-	6	-	4
80-100	:	5.1	-	1.5	-	6	-	4
110-150	:	4.8	-	0.8	-	4	-	2

Depth (cm)		pH NaF	P Retention (%)	ODOE	Melanic Index	Fe o (wt%)	Al o (wt%)	Si o (wt%)	Fe d (wt%)	Al d (wt%)	Fe p (wt%)	Al p (wt%)	C p (wt%)
0-7	:	-	-	-	-	0.23	0.07	0.01	2.66	0.36	-	-	-
10-30	:	-	-	-	-	0.37	0.14	0.02	3.72	0.42	-	-	-
40-70	:	-	-	-	-	0.22	0.18	0.03	5.69	0.70	-	1	-
80-100	:	-	-	-	-	0.15	0.15	0.02	6.14	0.65	-	1	-
110-150	:	-	-	-	-	0.14	0.17	0.03	5.87	0.53	-	-	-

Elemental composition of the clay:

Depth (cm)		SiO2 (wt%)	Al2O3 (wt%)	Fe2O3 (wt%)	CaO (wt%)	MgO (wt%)	K2O (wt%)	Na2O (wt%)	TiO2 (wt%)
0-7	:	38.8	32.8	13.0	0.08	0.21	0.16	-	1.63
7-20	:	37.5	33.3	14.1	0.00	0.13	0.11	-	1.57
40-70	:	36.0	33.4	14.9	0.02	0.12	0.06	-	1.64
80-100	:	36.3	33.2	15.0	0.00	0.11	0.07	-	1.58
110-150	:	36.0	32.8	15.2	0.00	0.11	0.08	-	1.64

Elemental composition of the clay:

Depth (cm)		MnO2 (wt%)	P2O5 (wt%)	Ign.Loss clay (wt%)	Total clay (%)	SiO2 / Al2O3 (mol/mol)	SiO2 / Fe2O3 (mol/mol)	SiO2 / R (mol/mol)	Al2O3 / Fe2O3 (mol/mol)
0-10	:	0.07	0.36	14.1	101.21	2	7.9	1.6	4
10-30	:	0.03	0.29	13.9	100.93	1.9	7.1	1.5	3.7
40-70	:	0.03	0.18	13.97	100.25	1.8	6.4	1.4	3.5
80-100	:	0.03	0.23	13.8	100.32	1.9	6.4	1.4	3.5
110-150	:	0.03	0.18	13.9	99.94	1.9	6.3	1.4	3.4

Elemental composition of the soil:

Depth (cm)		SiO2 (wt%)	Al2O3 (wt%)	Fe2O3 (wt%)	CaO (wt%)	MgO (wt%)	K2O (wt%)	Na2O (wt%)	TiO2 (wt%)
0-10	:	75.3	7.4	8.7	0.07	0.09	0.04	-	0.75
10-30	:	70.5	11.5	9.8	0.00	0.07	0.04	-	0.94
40-70	:	52.6	20.9	14.1	0.00	0.10	0.04	-	1.34
80-100	:	48.4	24.7	14.9	0.00	0.06	0.07	-	1.424
110-150	:	49.8	25.7	14.2	0.00	0.07	0.08	-	1.44

Elemental composition of the soil:

Depth (cm)		MnO2 (wt%)	P2O5 (wt%)	LOI (wt%)	SiO2 / Al2O3 (mol/mol)	SiO2 / Fe2O3 (mol/mol)	SiO2 / R (mol/mol)	Al2O3 / Fe2O3 (mol/mol)
0-10	:	0.04	0.05	9.0	17.3	23.0	9.96	1.3
10-30	:	0.02	0.04	7.0	10.4	19.1	6.7	1.8
40-70	:	0.03	0.05	10.2	4.3	9.9	3	2.3
80-100	:	0.02	0.03	11.0	3.3	8.6	2.4	2.6
115-135	:	0.02	0.03	10.8	3.3	90.3	2.4	2.8

Clay mineralogy:

Depth (cm)		Kaolinite	Mica / illite	Vermiculite	Chlorite	Smec	Halloysite	Mixed layer	Quar	Feldspar	Gibbsite	Goethite	Hematite
0-10	:	very strong	-	-	very weak to weak	-	-	-	-	-	weak	weak to medium	-
10-30	:	very strong	-	very weak	weak	-	-	-	-	-	weak	weak to medium	-
40-70	:	very strong	-	-	weak	-	-	-	-	-	weak	weak to medium	-
80-100	:	very strong	-	-	weak	-	-	-	-	-	weak	weak to medium	-
110-150	:	very strong	-	-	weak	-	-	-	-	-	very weak to weak	weak to medium	-

Profile description

Ahoc 0-10 cm	dark brown (7.5YR 3/4, moist), very gravelly sandy loam, weak fine subangular blocky, very friable slightly sticky slightly plastic, many micro to medium interstitial pores and many micro to medium tubular pores, many fine many coarse roots, frequent medium spherical hard ferruginous concretions and nodules, non calcareous, clear smooth boundary to,
Boc1 10-30 cm	yellowish red (5YR 5/6, moist), very gravelly sandy clay loam, moderate fine subangular blocky, friable sticky plastic, many micro to fine tubular common pores and common fine and medium interstitial pores, few fine roots, very frequent medium spherical hard ferruginous concretions and nodules, non calcareous, gradual smooth boundary to,
Boc2 30-80 cm	red (2.5YR 4/8, moist), very gravelly clay, moderate fine subangular blocky, friable sticky plastic, many very fine and fine tubular pores and many very fine and fine interstitial pores, few fine roots, very frequent medium spherical hard ferruginous concretions and nodules, non calcareous, diffuse smooth boundary to,
Bto 80-150 cm	red (2.5YR 4/6, moist), slightly gravelly clay, moderate fine angular blocky and moderate medium angular blocky, friable sticky plastic, few (2-5%) fine prominent clear mottles (10 YR 6/8), broken moderately thick clay and sesquioxide cutans around nodules, common very fine and fine interstitial common very fine and fine tubular pores, few fine roots, few medium angular hard ferruginous concretions and few medium angular hard argillaceous concretions, non calcareous,

The main parent rock/ material over which the soil has been formed (1st entry)	metamorphic rock
Mode of Accumulation or deposition of parent material (1st entry)	residual material
Texture of parent material (1st entry)	clayey
Weathering status of solid rock (1st entry)	highly
Resistance against weathering (solid rock) (1st entry)	moderate
Depth1 of lithological boundary	cm
The main parent rock/ material over which the soil has been formed (2nd entry)
Resistance against weathering (solid rock) (2nd entry)
Soil Depth; depth to which roots can easily penetrate throughout the year	cm
Remarks on Parent Materials	Precambriuan migmatite rich in biotite. saprolite

Soil erosion type (1st entry)	sheet
Intensity of the soil erosion type (1st entry)	slight
Occurrence of soil aggradation
Slope Stability

Current land use at the site	nature and game preservation
Major crops
Main type of irrigation
Rotation scheme
Vegetation Type;The natural vegetation at the site	evergreen forest
Status of vegetation	primary
Remarks on Land Use / Vegetation	Tropical lowland forest, national park

The altitude of the soil profile relative to mean sea level, specified in meters	173 m asl
Regional landform	peneplain
Topography of the surrounding country	rolling
Physiographic Unit in the immediate surrounding of the site	slope of dissected peneplain
The slope refers to the inclination of the land immediately surrounding the site. The measured or estimated slope angle is specified to the nearest per cent	5 %
The physiographic position of the site where the profile is located	middle slope
Form of the slope surrounding the site	convex
Slope Aspect of the site	south-west

Depth of groundwater table	cm
Groundwater Top	cm
Groundwater Bottom	cm
Kind of groundwater table	no groundwater table observed
Top Stagnating Layer	cm
Bottom Stagnating Layer	cm
Runoff	slow
Flooding frequency	never
Estimated permeablity (class) of least permeable part of the profile	high
Drainage Class	well
To Drainage Class
Moisture conditions of the profile: dry from -to	cm
Moisture conditions of the profile: moist from -to	0-80 cm
Wet From - To	cm

Microrelief type: small-scale differences in relief in the direct vicinity of the site		termite/ant mounds
Microrelief Pattern		isolated
Microrelief Height		60
Rockiness		none
Stoniness		none
Average size of stones
Shape of stones (on average)
Cracks		no cracks observed
Slaking of aggregates by tillage, rainfall or frost		no surface slaking/crusting observed
Evidence of salt		non-saline
Evidence of alkali		non-alkaline

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Reference soil Côte d'Ivoire 2: Acrisol