PROFILE EUR12 - ES.T
Mount of Las
Authors: A. G. Jongmans and F.
van Oort, (based on the field guide of COST ACTION622, Tenenfe, 10-12
February. 2000, Edited by M Tejedor and C.C. Jimenez).
Location: Mount of Las Mercedes (TF-1143) crossroad to the Monuial.
Altitude: 1 000 m
number and co-ordinates:
Click on image to enlarge
WRB (2001): Umbri-Vitric
Andosol (Pachic and Hyperdystric)
ST (1999): Ashy, glassy,
mesic Humic Udivitrand
Climate: Mesic temperature regime, Udic moisture regime
Position: Crest - upper slope
Steep, N. direction
Green Forest, (Laurisilva, and Fayal brezal).
material: Surface soil (A1 and Bw) are basaltic ashes (9000 yrs), underneath
these deposits totally weathered basaltic lava.
Effective soil depth: Deep
No erosion features visible.
coarse fragments: Many fine gravel to boulders.
class: Upper deposits: Well drained; Underlying altered lava somewhat poorly.
drainage: 0-110/130 cm, never saturated. > 130 moderately slow permeability
condition: Moist throughout the profile.
SOIL HORIZON DESCRIPTION:
Ah1: 0-15/20 cm; dark
reddish brown (5YR 3/2); silt loam; no rock fragments; moderate very fine to
fine granular structure; friable
when moist, non sticky non plastic when wet; very few fine
pores, common very fine to fine roots; clear and wavy to:
Ah2: 15/20-65 cm; silt loam;
few subangular totally weathered gravel; moderate very fine to fine granular
structure; friable when moist, non sticky non plastic when wet; charcoal
present; many very fine to coarse roots; abrupt and wavy to:
Bw: 65-90/120 cm; dark
reddish brown (5YR 3/3); silt loam; moderate very fine subangular blocky;
friable when moist, slightly sticky, slightly plastic when wet; few fine
whitish nodules; many very fine pores; few fine to medium roots; few medium
charcoal; abrupt and wavy to:
2Ahb: 90/120-100/130 cm;
reddish brown (5YR 4/3); silty clay loam; no rock fragments; moderate fine
subangular blocky; friable when moist, sticky and plastic when wet; few fine
pores; few fine and medium roots; clear and wavy to:
3Bwb: >100/130 cm; reddish
brown (2.5YR 4/4), clay.
umbric horizon (0-65 cm); vitric horizon (0->100/130 cm); no andic horizon
because Alo + ½ Feo < 2.0%; BS < 20 between 15/20 and
Umbri-Vitric Andosol (Pachic and
colour indication Ah2 15/20-65 cm is lacking but assumed to be dark enough to
umbric epipedon (0-65 cm); andic soil properties (0->100/130 cm); glass
content between 65 and 95% in 0.05-0.5 mm fraction:
Ashy, glassy, mesic Humic Udivitrand
30 April 2004