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ICELANDIC
SOIL PROFILES
PROFILE EUR07 - IS
Route1- August 1999
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Date of description: 26-08-1999
Authors: A. G. Jongmans and F. van Oort, O.
Arnalds
Location: NW Iceland, (farm on Route N 1,
200m west of Hvammstangi road intersection)
Altitude: 40m
GPS co-ordinates: x 504800, y 724850. '
Map and co-ordinates:
Classification:
WRB (2001): Orthidystri-Vitric Andosol
ST (1999): ashy, amorphic Typic Vitricryand |
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Soil Climate: Cryic/Frigid temperature
regime, Udic moisture regime. Annual rainfall 550 m m; mean annual temperature
2.5°C, mild winter, cool summer.
Topography: Gently rolling
Landform: Glaciated upland
Land element: Slope, west facing
Position: Middle slope
Slope: Gently sloping
Form: complex
Micro topography : Hummocky area, hummocks
are somewhat steep, 20-50 cm high and 0,5-1.5 m2
in size, but shapes and sizes are variable.
Landuse/Vegetation: Typical "half drained",
strongly disturbed vegetation; > 80% grass cover with Carex species,
(Taraxacum, Polygonum) and other flowers.
Human influences: Shallow ditch (1.5m deep,
20 yrs old) about 12m from the pit.
Parent material: Bedrock is about 10 000
yrs old glacial tilt, mostly basaltic. On the top of it are about 1 m thick
aeolian and tephra deposits, mostly basaltic but with distinctive rhyolitic
tephra layers. Soil has formed in aeolian and tephra sediments.
Effective soil depth: Moderately deep
Rock outcrops: none
Erosion: Currently little to no erosion.
Drainage class: Somewhat poorly drained.
Internal drainage: Saturated tor extended
periods due to frost blockage, moderately hydraulic conductivity
External drainage: Slow run-off
Groundwater: No flooding but covered with
snow 2-6 months per year. Very deep groundwater 100-150 cm
Moisture conditions: Mois
SOIL HORIZON
DESCRIPTION:
O: 0-5 cm; dark reddish brown (5YR 3/2);
dominantly partly decomposed organic material; some mineral particles are
present; very weak fine granular structure; clear and smooth to:
Ah: 5-17 cm; dark reddish brown (5YR
3/3); loam; weak, fine sub angular blocky/granular structure; friable; pores
are not detectable; common very fine and fine roots; abrupt and wavy to:
AC: 17-35/50 cm; dark reddish brown
(2.5YR 3/4); organic clay loam; few, fine, angular basaltic gravel, fresh and
slightly weathered; weak very fine sub angular blocky structure; friable; no
pores detectable; common very fine and fine roots; altered basaltic tephra
spots, 5YR 2.5/1, in the top of the horizon; abrupt and wavy to:
2BC: 35/50-65 cm; dark reddish brown
(5YR 3/2), and dark reddish brown (5YR 2.5/2); stratified horizon; organic
clay loam; moderate fine platy structure; friable; few fine to medium iron
mottles, brown to dark brown (7.5YR 4/4); common, fine to coarse roots; smooth
to:
3BC: 65-73 cm; brownish yellow (10YR
6/6) and yellowish brown (10YR 5/4); organic loam; no macro structure;
friable; common fine and medium roots; few, distinct iron mottles, red (2.5YR
5/8); smooth to:
3CB: 73-82 cm; stratified horizon,
consisting of H4 tephras from Hekla (4000 yrs BP) having two colours: lower
part yellowish brown (10YR 5/4), upper part (3 cm) very dark grey to black
(5YR 2.5/1); thickness of the individual layers range from 0.5-4 cm; light
coloured tephra: loam; dark coloured tephra: organic clay loam; moderate fine
platy structure; friable; common fine and medium and few coarse roots; very
few, fine and medium iron mottles, red (2.5YR 5/8); abrupt and smooth to:
4Bw: 82-90/100 cm; dark reddish brown
(5YR 3/3); organic clay loam; few coarse partly altered basaltic gravel and
stones; weak, fine sub angular blocky; friable; common fine roots; few,
medium, distinct iron mottles, red (2.5YR 5/8), dominantly concentrated along
pores and stones; abrupt and wavy to:
4B/Cg: > 90/100 cm; dark grey (5Y4/1);
clay; many coarse gravel to boulders, sub angular, altered; no macro
structure; friable; common, medium and coarse, prominent iron mottles, red
(2.5YR 4/8), dominantly concentrated around pores and stones; few fine roots;
WRB (2001):
no histic or folic horizon (org. C content less than 20%); vitric horizon
(more than 10% volcanic glass between 5 and 90/100 cm; P-retention > 25%; Alo
+ ½ Feo > 0.4 throughout); BS < 50% between 17 and 90/100 cm
throughout:
Orthidystri-Vitric Andosol
ST
(1999): no histic or folistic horizon (org. C
content less than 20%); andic soil properties between 0 and >90/100 cm; 8x Sio
+ 2x Feo > 5, 8x Sio > 2x Feo, except
for AC (17-35/50 cm):
Ashy, amorphic Typic Vitricryand
Last modified
30 April 2004
by EG
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