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Briagolong (Bg)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Briagolong- geoArea: 119 sq. km (0.6%)

Prior-stream courses are clearly evident across parts of the later Pleistocene terrace; most of these are included in the Briagolong land system. Partially infilled stream channels occur together with characteristic old levees of reddish alluvium. This reddish alluvium is extensive in the upstream parts of the former stream courses. Near Cowwarr and Briagolong. the old stream deposits resemble outwash fans. Further downstream a clay plain becomes more common and ultimately dominates, to become the Sale land system. Local run-off water still ponds in some of the old stream channels.

Most of the surface alluvial deposits are clays and silts. The frequency of reddish colours in these materials is probably due to high permeability and to redness of the parent materials. In most of the land system, duplex and gradational soils have formed. Leaching has not been very intense and the subsoils tend to be neutral to slightly alkaline at depth, possibly due to the presence of calcium carbonate or sodium ions. Where drainage is poorer the soils are often strongly mottled.

The native vegetation. now almost entirely removed. appears to have been mainly grassy open forest II dominated by E. tereticornis.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Briagolong- image
A Briagolong relict channel with Eucalyptus tereticornis (forest red gum) growing on the Hatter land above it.

CLIMATE
Rainfall, mean (mm)
Temperature, mean (C)
Seasonal growth limitations

    Annual 500 - 800: lowest July (30 - 50), highest October (50 - 80)

    Annual 12 - 14: lowest July (8 - 10). highest February (19 - 21)
    Temperature <10C (av.): June - August
    Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology

    Upper
    Pleistocene alluvial deposits of gravels, sands, minor silts and clays
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Relict levees and outwash fans

    20 - 60
    0 - 10
    Dendritic
    1.4
PRESENT LAND USE
    Cleared: grazing of beef and dairy cattle on improved and often irrigated pastures: cropping (limited): apiculture (limited)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Briagolong- csA study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Briagolong- graph

LAND COMPONENT
Percentage of land system
Diagnostic features
1
30
Dissected fans with
red soils
2
20
Levees and levee
slopes with loamy to
clayey soils
3
20
Levees and levee
slopes with sandy soils
4
15
Plains
(too small to map as Sale
land system)
5
15
Channels, swales,
oxbows, often partially
filled
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
<5. (0 - 15)
Convex
2. (0 - 5)
Convex, concave
2. (0 - 5)
Convex, concave
2, (0 - 3)
Straight
1, (0 - 5)
Concave
SOIL
Parent material
Silt, clay, sand and gravel
Description
Dark brown sandy loam to clay loam topsoil abruptly overlying blocky red or reddish brown clay subsoil
Limited observations — probably as for component 1, but often with lighter textured subsoil
No observations — probably uniform and gradational soils with sandy textures
Limited observations — mottled yellow and brown gradational, duplex and uniform soils
No observations — probably mottled greyish brown fine textured soils
Classification
Red-brown Earths and intergrades with Solodic Soils
Dr2.22. Dr3.21. Dr3.22
Red-brown Earths, Red Earths
Dr3.22. Um5.52
-
Wiesenboden, Yellow Earths.
Yellow Podzolic Soils and Solodic Soils
Gn3.73. Um5.52
Humic Gleys
Surface texture
Sandy loam to clay loam
-
Probably clay loam to clay
Surface consistence
Soft to hard when dry
-
Firm when moist
Depth (m)
>2.0
>2.0
Probably similar to Sale land system, component 1
>2.0
Nutrient status
Moderate
Low to moderate (?)
Moderate
Available soil water capacity
Moderate
Low to moderate (?)
Moderate
Perviousness to water
Slow
Slow to moderate
Moderate to rapid
Slow
Drainage
Moderately good to good
Moderately good to good
Good
Very poor to poor
Exposed stone (%)
0
0
0
0
0
Sampled profile number
57.58
-
-
-
-
NATIVE VEGETATION
Structure of vegetation and characteristic species of dominant stratum
(+ Predominant species)
Grassy open forest II: E. tereticornis+
Clearing has made it difficult to determine if any other predominant or associated species

Disturbance
Affected process and trend
Primary resultant deterioration
Casual activities
Primary off-site process
Form
Susceptibility of components
Incidence with components
    Alteration of vegetation:
    — reduction in leaf area, rooting depth and/or perenniality
Reduced transpiration, resulting in increased deep percolation and leachingNutrient lossNot determinedNot determinedRemoval of treesIncreased movement of water to groundwater.
    Increased exposure of surface soil
Increased overland flow and soil detachmentSheet and rill erosion1; low
2,3; moderate
Uncommon; local occurrenceClearing, cultivation, burning, overgrazing, earth-moving activities, rabbit burrowing, trafficking by stock and vehicles.Increased flash flows and sediment load.
    Increased physical pressure on soil
Increased compaction

With

reduced infiltration
Structure decline



Sheet and rill erosion
1,2,4; moderate
3; low – moderate


l: low
2.3: moderate
Not determined



Uncommon: local
occurrence
Increased trafficking and cultivation, overgrazing, export of organic matter

As for sheet and rill
erosion above
-



Increased flash flows
    Increased soil disruption
Increased soil break-upGully erosion12,3,4: low
5; moderate
Uncommon; local occurrenceAs for sheet and rill erosion aboveIncreased sediment load.
Comments: -
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