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Soils on Granitic Terrain

Dgh - Slopes with Duplex Soils on Devonian Granite | Dgg - Plains and Rises with Duplex Soils on Devonian Granite

Dgg - Plains and Rises with Duplex Soils on Devonian Granite

Plains and Rises with Duplex Soils on Devonian Granite - DggPlains and rises on granite located at and to the north of Lilydale House, Dog Rocks. These are three areas, totalling 3.3 km2, or 0.5% of the Shire. The rises usually have granite outcrops and tore on the upper slopes and crest. The lower slopes are much gentler. The wash from this land system, being sandy, may influence the topsoil texture of surrounding land systems.

The main land use is grazing but there is a flora and fauna reserve at Lilydale House, Dog Rocks. This Boil has a particular susceptibility to Boneseed (Chrysanthemoides monilifera) infestations.

SOILS
The most common soil type is that of Component 1.

Mottled Brown Duplex Soils

Factual Key: Dy 3.42/sandy loam, 25-50 cm/granite 100-200 cm

Horizon
Depth (cm)
Description
A1
0-25
Dark brown (10YR 3/3) when moist; sandy loam; apedal and massive; consistence when slightly moist is firm; pH 5.5; clear boundary.
A2
25-35
Dull yellow orange (10YR 6/3) when moist; clayey coarse sand; apedal and massive; consistence when slightly moist is loose; pH 7.0; abrupt boundary.
35-50+
Bright brown (7.5YR 5/8) when moist; with red mottles; medium clay; strong angular blocky 2 mm; consistence when moist is firm; moderate dispersibility and slaking; pH 7.5.

COMPONENT
Proportion %
1
60
2
40
CLIMATE
Rainfall(av.) mm
Annual 510 – 560
Temperature(av.) C
Annual 13
GEOLOGY
Age, rock
Devonian granite
TOPOGRAPHY
Landscape
Three isolated occurrences of undulating terrain on the south-eastern border
Elevation (range) m
30-99
Local relief (av.) m
35
Drainage pattern
Dendritic
Drainage density km/km2
1.3
Land form
Plain
Rise with tore on crest
Position on land form
Lower slope
Upper slope
Slope (range) %, slope shape
1-; Straight
3-10 ; Convex
NATIVE VEGETATION
Structure
Woodland ?
Dominant species
E. leucoxylon
SOIL
Parent material
In-situ weathered rock
Description
Mottled brown duplex soils
Shallow mottled brown duplex soils
Factual key
Db 2.22
Db 2.22
Surface texture
Sandy loam
Sandy loam
Permeability
Moderate
Moderate
Depth (range) m
1.0 - 2.0
0.3 - 1.0
LAND USE
Grazing
SOIL DETERIORATION
Critical land features
Slope position
Slope gradient, hard setting surfaces
Processes
Surface runoff
Surface flow
Forms
Minor sheet erosion
Moderate sheet and rill erosion


Dgh - Slopes with Duplex Soils on Devonian Granite

Slopes with Duplex Soils on Devonian Granite - DghModerate slopes cut in the granite plains by Sutherland Creek and Moorabool River at "Darriwill", Hope's Bridge. There are only three small areas, comprising 0.1 km2 in total, or 0.0296 of the Shire.

The slopes often have huge granitic outcrops and the depth of soil varies from a few centimetres to over a metre in some places. The mottled brown, duplex soils will rill and gully readily if the vegetative cover is damaged, particularly in areas which receive surface runoff from the granite plains.

SOILS
The soil occurs in patches between the rock. Where the soils are very shallow, only the A horizons may be present. The description refers to deeper profiles.

Mottled Brown Duplex Soils - Coarse Structure

Factual Keys Db 2.22/SCL, 5-20 cm/granite

Horizon
Depth (cm)
Description
A1
0-15
Dark brown (10YR 3/3) when moist, sandy clay loam; hydrophobic; apedal and massive; consistence when dry is hard; pH 6.0; abrupt boundary.
A2
15-35
Dull yellowish brown (10YR 4/3) when moist; sandy clay loam; apedal and massive; consistence when dry is hard; pH 6.0; abrupt boundary.
B
35-60+
Brown (10YR 4/6) with red mottles, clay; coarse primary structure breaking down to a find angular blocky structure 2 mm; consistence when moist is firm; clay slakes rapidly when wetted; pH 7.0.

COMPONENT
Proportion %
1
100
CLIMATE
Rainfall(av.) mm
Annual 510 – 560
Temperature(av.) C
Annual 13
GEOLOGY
Age, rock
Devonian granite
TOPOGRAPHY
Landscape
Gentle scarps at Darriwill area
Elevation (range) m
46 - 61
Local relief (av.) m
15
Drainage pattern
Dendritic
Drainage density km/km2
1.4
Land form
Scarps with tore
Position on land form
-
Slope (range) %, slope shape
10-20 ; Straight
NATIVE VEGETATION
Structure
Woodland ?
Dominant species
E. leucoxylon
SOIL
Parent material
In-situ weathered rock
Description
Mottled brown duplex soils, coarse structure
Factual key
Db 2.22
Surface texture
Sandy loam
Permeability
Moderate
Depth (range) m
0.5 - 1.2
LAND USE
Grazing
SOIL DETERIORATION
Critical land features
Slope gradient, dispersibility
Processes
Sub-surface and overland flow
Forms
Moderate gully and sheet erosion
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