PROFILE N5 - PAZ
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Soil Climate; Mesic temperature regime, Udic moisture
regime.
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Topography: Gently undulating
¨
Landform: Volcano
¨ Land element: Slope,
¨
Position: Middle slope
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Slope: Sloping (10-15%)
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Form: Concave
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Landuse/Vegetation: Extensive grazing, pasture
¨
Human influences: Profile is situated in a road cut,
renewed for 1 m.
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Parent material: Pyroclastic material.
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Effective soil depth: Deep
¨
Erosion: No erosion features visible.
¨
Drainage class: Well drained.
¨
Moisture conditions: Moist
N5 - PAZ SOIL HORIZON DESCRIPTION:
A1:
0-25 cm: 7.5YR 3/2; silt loam; few fine to medium gravel consisting of
white pumice- and dark basaltic fragments, partially weathered; weak, very fine
(sub) angular blocky structure; friable; few very fine to fine pores; common
fine roots; 0-5 cm Fe coatings round pores; abrupt and smooth to:
A/C: 25-30 cm: 10YR 4/3 – 10YR 5/3; disturbed layered loamy sand;
common fine to medium slightly to strongly weathered gravel consisting of
pumice; friable and firm; few fine pores; few fine roots; abrupt and smooth to:
2Ab: 30-45 cm; 7.5YR 3/2; clay loam;
very few, very fine gravel; moderate ,medium, compound rough prismatic
structure, subdivided into weak, very fine, (sub)angular blocky structure;
friable; common very fine and fine pores; few very fine roots; slightly
thixotropic; gradual and smooth to;
2Bw: 45-65 cm; 7.5YR 4/3; clay loam;
weak very fine and fine subangular and angular blocky structure; friable; many
very fine and fine pores; few very fine and fine roots; in the lower part of
the horizon occurrence of angular fragments of the 2 C1 horizon; gradual and
smooth to:
2Bw/C: 65-90 cm; This horizon
consists of two parts: 2Bw material already described and angular pieces of 2C1
material which are described below; in the 2Bw material presence of fine textured
allophane coatings with Fe compounds, diameter 1 mm.; clear and smooth to:
2C1: 90-110 cm; 10YR 3/1; clay loam; structureless massive; firm to
extremely hard; presence of skew planes, coated by fine textured material 10YR
4/6 to 10YR 5/8, and Fe coatings, 5YR3/4 , few very fine pores coated with fine
textured material 2.5YR 8/4 and Mn coatings 10YR 2/1; abrupt and wavy to:
2C2 110-130 cm; indurated lapilli, partially covered by iron, 10YR
3/2, partially altered and thixotropic, locally allophane coatings 2.5YR 8/4;
clear and smooth to:
3BC 130-145 cm; 7.5YR 4/4; clay loam; weak very fine to fine
subangular blocky structure; friable; many fine pores; 40% totally altered
pumice fragments, 5YR 6/8; abrupt and smooth to
4Bw. Not described
PROFILE N6 - PAZ
¨
Soil Climate; Mesic temperature regime, Udic
moisture regime.
¨
Topography: Hilly
¨
Landform: Volcano
¨ Land element: Slope,
¨
Position: Middle slope
¨
Slope: Located on a sloping (5-10%) slope; main slope is
moderately steep
¨
Form: Straight slope
¨
Landuse/Vegetation: Forest, Cryptomeria japonica, Pittosporum
undulatum, Erica agorica, Rubus, Fern
¨
Human influences: Profile is situated in a road cut,
renewed for 1 m.
¨
Parent material: Basaltic pyroclastic material.
¨
Effective soil depth: Deep
¨
Erosion: No erosion features visible.
¨
Drainage class: Moderately well drained.
¨
Moisture conditions: Moist
N6 - PAZ SOIL HORIZON DESCRIPTION:
A1
0-35/40 cm; 5YR 3/2; clay loam; strong very fine granular in clustered distribution
pattern, and strong fine and medium subangular blocky structure; very friable;
common very fine and fine pores; few to common fine to medium roots; charcoal
fragments; clear and smooth to:
AB
34/40-40/50 cm; 7.5YR3/4; clay loam; few fine subrounded totally altered
gravel; pockets of strong very fine granular structure; strong fine and medium
angular and subangular blocky structure; very friable; few to common very fine
and fine pores; few fine and medium roots; dead roots, partially decomposed are
present; clear and smooth to:
2AB
40/50-60/70 cm; 7.5YR 3/2; clay loam; few partially and totally
weathered subrounded gravel, 2.5YR3/4 ,thixotropic; dominantly moderate fine
(sub)angular blocky structure, in channels strong very fine granular structure;
common very fine and fine pores; few fine roots, partially decomposed; gradual
and smooth to:
2Bw1 60/70-95/100 cm; 10YR3/3; clay
loam; few totally weathered gravel, 2.5YR3/4; very weak coarse prismatic
structure, subdivided into strong very fine angular blocky structure; in
channels locally strong fine granular structure; friable; common very fine and
fine pores; few fine and medium roots; few dead roots; gradual and smooth to:
2Bw2 95/90-125 cm; 7.5YR3/4; clay
loam; common fine medium and coarse totally and partially weathered gravel,in
vesicles in the fragments yellowish/white allophane coatings; moderately fine
angular blocky structure; friable; many fine and very fine pores; very few fine
roots; dead roots present; clear and smooth to:
2Bw3 125-140 cm; 5YR4/4; clay loam;
many fine to medium and coarse subrounded fresh ,partially and totally
weathered gravel; common very fine and fine pores; few fine roots; dead roots
present; abrupt and smooth to:
3C >140 cm; 2.5YR3/2; alteration of bands of fine gravel and
gravely clay loam; bands are thixotropic; yellowish fine textured coatings.