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Site SW54

Location: Cooriemungle.Australian Soil Classification: Acidic, Eutrophic, Grey DERMOSOL.
General Landscape Description: Gleyed soil on alluvial fan/toe slope of landslide.Geology: Quaternary alluvium derived from Gellibrand Marl.

Image: GP54 Landscape
Site SW54 Landscape.


Soil Profile Morphology:

Surface Soil

A10-15 cmVery dark greyish brown (10YR3/2 moist, 10YR5/3 dry); fine sandy loam; weak medium (<20 mm) polyhedral structure; pH 5.7: abrupt and smooth change to:

Image: GP54 Profile
Site SW54 profile.
A215-35 cmGrey (2.5Y6/1 moist); conspicuously bleached (2.5Y7/2 dry); clay loam; apedal, strong consistence; pH 5.4; abrupt and smooth change to:

Subsoil
B21g35-80 cmGrey (2.5Y5/1 moist) with (~15%) yellowish brown (10YR5/6 moist) mottles common; light clay; fine (<10 mm) polyhedral structure; very firm consistence; pH 5.2; diffuse and smooth change to:

B22g80-130 cmGrey (2.5Y5/1 moist) with many (~25%), yellowish brown (10YR5/6 moist) mottles; medium clay; coarse (50 mm) polyhedral or angular blocky, parting to coarse to medium (20-40 mm) polyhedral structure; pH 5.2; diffuse and smooth change to:

B23gss130 cm+Dark grey (2.5Y4/1 moist) with a few (~10%) yellowish brown (10YR5/6 moist) mottles; heavy clay; coarse (50 mm) polyhedral or angular blocky, parting to coarse to medium (20-40 mm) polyhedral structure; slickensides (up to 10 cm); pH 5.4.


Key Profile Features:
  • Gradual increase in texture i.e. clay content, down the soil profile.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Low - Medium
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Acid
Low
Sodic
None
Deeper subsoil
(at 80+ cm)
Strongly Acid
Low-Medium
Sodic
None
Image: GP54 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-15
5.7
5.1
0.44
0.09
8.3
3.7
0.6
0.8
A2
15-35
5.4
4.5
0.19
2.7
3.2
0.44
1.2
B21
35-80
5.2
4.4
0.25
3.2
4.9
0.41
1.6
B22
80-130
5.2
4.4
0.26
0.06
3.7
6.5
0.2
1.5
B23
130+
5.4
4.5
0.23

Horizon
Horizon Depth
(cm)
Exchangeable Aluminium
mg/kg
Exchangeable Acidity
meq/100g
Field
Capacity
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0 mm)
Fine Sand
(0.02-0.2 mm)
Silt
(0.002-0.02 mm)
Clay
(<0.002 mm)
A1
0-15
<10
14
42
16
7
31
27
22
A2
15-35
170
10
29
12
2
44
25
26
B21
35-80
270
11
32
32
2
40
21
36
B22
80-130
180
9.2
15
17
1
35
19
42
B23
130+

Management Considerations:

Whole Profile
  • The high exchangeable aluminium levels measured in the strongly acid soil profile (below surface horizon) are likely to restrict the growth of aluminium sensitive species.
Subsoil (B) Horizons
  • The subsoil is slightly sodic but does not disperse. The high levels of exchangeable aluminium are likely to prevent dispersion occurring.
Profile Described By: Mark Imhof and Richard MacEwan, April 1999.
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