PROFILE EUR11 - ES.T
Tauce-Guia de Isora
Authors: A.G. Jongmans, and F.
van Oort (based on the field guide of COST ACTION 622, Tenerife, 10-12
February. 2000, Edited by M. Tejedor and C.C. Jimenez).
Location: Spain, Tenerife, Road “Boca Tauce-Guia de Isora (C823) between km
Altitude: 1675 m
number and Co-ordinates:
Click on image to enlarge
WRB (2001) : Skeleti-Vitric Andosol (Orthieutric)
ST (1999) : Ashy-pumiceous, glassy, mesic
Climate: Mesic temperature regime, Xeric moisture regime
Position: Middle slope
Forest, Pinus canariensis, 0-50 yrs old.
material: Superposed basaltic scoria and layers of basaltic lapilli.
No erosion features visible.
Effective soil depth: Shallow, but tree roots are observed up till m.
coarse fragments: Many fine gravel to boulders.
class: Somewhat excessively drained
drainage: Never saturated, strongly permeable.
condition: Moist throughout the profile.
SOIL HORIZON DESCRIPTION:
Ah: 0-10 cm; very dark grey
to black (5YR 2.5/1); loam; common fine to coarse fresh gravel; moderate very
fine granular structure; very friable when moist; no pores detectable other
than the granular packing voids; common very fine to medium roots; abrupt and
C: 10-18 cm;
YR 2/0; dominant angular fine to
coarse fresh and slightly altered gravel (vitric lapilli); no macro structure;
very friable; no pores other than packing voids; common fine and medium roots;
abrupt and smooth to:
2Bwb: 18-35 cm; brown to dark
brown (7.5YR 4/4); loam; many fine weathered subrounded gravel to stones; weak
fine subangular blocky; tending to granular; friable; slightly thixotropic; no
pores detectable; common very fine to coarse roots; gradual and. smooth to:
2BCb: 35-45/50 cm; strong
brown (7.5YR 5/8); sandy loam; many fine subrounded gravel to stones,
partially weathered; no macro structure; very friable; no pores; common very
fine to coarse roots; abrupt and wavy to:
3C: >50 cm; the horizon
dominantly consists of fresh scoria fragments (gravel and stones), black
(7.5YR 2/0); the under surface of the scoria are partially coated with fine
textured material, white (10YR 8/1) to
pale yellow (2.5Y 8/4),
(allophane?); mycorrizha and tree roots are present.
ochric horizon (0-10 cm); vitric horizon (0->55cm); 50 and >70% coarse
fragments; BS >50%, but <80% throughout:
Skeleti-Vitric Andosol (Orthieutric)
ochric epipedon (0-10 cm); andic soil properties (0->55 cm); more than 35%
pumice-like coarse fragments; more than 70% glass in 0.05-0.5 mm fraction:
Ashy-pumiceous, glassy, mesic Typic Vitrixerand
30 April 2004