ANDOSOLS OF EUROPE
Soil Resources of European Volcanic Systems

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FRANCE SOIL PROFILES

PROFILE EUR16 - FR
Puy de La Vache. - june 2001

Date of description: June 2001

Authors: F. van Oort, M. Gérard, O. Spaargaren

Location: France, Massive Central, Puy de La Vache

Altitude: 1000 m

Co-ordinates:

Map number and Co-ordinates:

Classification:   
WRB (2001) : Umbri-Silandic Andosol (Endoskeletic and Endoeutric)

ST (1999): Medial over ashy-pumiceous, amorphic, mesic Humic Udivitrand

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Soil Climate: Udic soil moisture regime; Mesic soil temperature regime

Topography: Mountainous

Landform: Volcanic field

Land element: Slope

Position: WSW-ENE

Slope: 2-4% Down slope of Puy de La Vache

Form:

Microtopography:

Landuse/Vegetation: 100% forest cover

Human influences: Afforestation

Parent material:  Volcanic scoria

Rock outcrops: None

Effective soil depth: 

Erosion: No actual erosion

Drainage Class: Well drained

Internal drainage: Rapid

External drainage: No surface drainage

Moisture conditions: Moist throughout


SOIL HORIZON DESCRIPTION:

Ah1:   0-10 cm; dark brown (7.5YR 3/3) dry, (very) dark brown (7.5YR 2.5/3) moist silt loam weak very fine to fine crumb very friable moist, few gravel (scoriae) partially altered, very many fine and medium roots, very porous, clear smooth boundary

Ah2:   10-25 cm; (very) dark brown (7.5YR 2.5/3) moist, silt loam with many very coarse sand-sized and fine gravel size particles (altered to partially altered scoriae), weak and fine subangular blocky ; smooth boundary

Ah3:   25-45 cm; dark brown (7.5YR 3/2) moist, silt loam with common very coarse sand-sized and fine gravel size particles (altered to partially altered scoriae), very weak fine and medium subangular blocky structure friable, common fine and few medium roots, many fine interstitial and common tubular pores, clear and wavy boundary

Bw:    45-55 cm; dark brown (7.5YR 3/3) moist and brown to dark brown (7.5YR 4/4) around roots, silt loam with very many very coarse sand-sized and fine gravel size particles (altered to partially altered scoriae), very friable, common fine roots, many fine interstitial pores, few tubular pores, abrupt wavy boundary

C/R:   55-65 cm; very dark brown to very dark grey brown (10R 2.5/2) moist and patches of dark red (2.5YR 3/6); coarse sand and fine gravel, no structure, very many fine and medium interstitial pores and few tubular pores, few fine roots, gradual wavy boundary. Gravel (scoriae) embedded by iron oxihydroxides and some totally altered

R/C:   65-120 cm; black (10YR 2/1) and dark brown (7.5YR 3/3) moist and spots of dark reddish brown (5YR 3/4); dominantly fine gravel; no structure, spots or bands contain iron oxihydroxides, gradual and wavy boundary between 80 and 90 cm bands of material equivalents to the spots, very few fine roots, gravel relatively fresh (scoriae) with very small patches of bluish scoriae with white coating

R:      below 120 cm; coarse black bluish lapillis

 

WRB (2001): umbric horizon (0-45 cm); andic horizon (0-120 cm); Sio > 0.6% throughout; >35% gravel below 55 cm; BS >50% below 55 cm:

Umbri-Silandic Andosol (Endoskeletic and Endoeutric)

ST (1999): umbric epipedon (0-45 cm); andic soil properties (0-120 cm); 1500 kPa water retention assumed to be less than 15% on air-dried samples in more than 60% of the soil between 0 and 60 cm depth; ); 8x Sio + 2x Feo > 5, 8x Sio > 2x Feo:

Medial over ashy-pumiceous, amorphic, mesic Humic Udivitran


Last modified 30 April 2004 by EG