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Redgum 2 (R2)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Redgum2- geoArea: 331 sq. km (1.6%)

Redgum 2 also occurs on the earlier Pleistocene terraces and more distal parts of the Tertiary flood plain deposits, but differs from Redgum 1 land system in that it has suffered very little dissection. The original land surface is usually unchannelled and forms almost flat plains, commonly with low gilgai micro-relief.

Well-developed, duplex soils have formed on the flat terrain. Varying amounts of rounded gravels can occur within the profile. Erosion hazards are slight, but extensive clearing may aggravate waterlogging, particularly during winter and spring. The Redgum 2 land system is judged to have a moderate salinity hazard.

The native vegetation, mainly an E. tereticornis grassy open forest II, is now mostly cleared.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Redgum2- image
Flat plain with reeds growing in the wetter depressions. The dead trees are indicative of the decline in the
Eucalypt tereticornis (forest red gum) woodland which once covered most of this plain

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

    Annual 500 - 800; lowest July or August (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
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Almost flat plains, residual Pleistocene terraces

    20 - 90
    0 - 5
    Dendritic
    <0.1
PRESENT LAND USE
    Approximately half the area cleared: grazing of sheep and cattle; cropping (limited)
    Uncleared portion: firewood extraction (limited)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Redgum2- csA study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Redgum2- graph

LAND COMPONENT
Percentage of land system
Diagnostic features
1
95
Almost flat plains and slightly depressed areas with poorer drainage
2
5
Incised drainage depressions and bordering slopes
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
1, (0 - 4)
Straight
Variable, (0 - 10)
Concave
SOIL
Parent material
Clay, silt, sand and gravel, often stratified
Locally derived alluvial lag deposits
Description
Very dark greyish brown sandy loam to sandy clay loam topsoil grading
into greyish brown similarly textured subsurface soil, often mottled;
abrupt change to strongly mottled yellowish brown clay subsoil,
commonly alkaline at depth. Varying gravel content
No observations — probably mostly undifferentiated medium textured
dark greyish brown topsoil, brown subsoil and appreciable gravel
content
Classification
Solodic Soils, Solodized Solonetz Soils, Soloths
Dy3.23, Dy3.22, Dy3.33, Dy3.21, Dy3.13, Dy3.31, Dy2.43
-
Surface texture
Sandy loam to sandy clay loam
-
Surface consistence
Slightly hard to hard when dry
-
Depth (m)
>2.0
-
Nutrient status
Low
>2.0
Available soil water capacity
Low to moderate
-
Perviousness to water
Slow
-
Drainage
Mainly somewhat poor, in places poor
-
Exposed stone (%)
0
-
Sampled profile number
61, 64, 65
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Grassy open forest II:
Mainly E. tereticornis+
Occasionally E. globoidea or E. melliodora (Heyfield, Seaton areas) predominant or associated
Other species sometimes associated include E. bridgesiana, E. polyanthemos

    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:

    a) increased deep
    percolation


    b) raised winter/spring
    watertable



    Waterlogging



    Salting



    1; moderate



    1; moderate



    Common: seasonally



    Common: localised areas



    Removal of trees.
    Reduced plant-water use in catchment.

    Reduced plant water use
    in catchment



    Increased movement of water to groundwater


    Increased salting in lower areas

    Increased exposure of surface soil
    Increased overland flow and soil detachment
    Sheet and rill erosion
    1; very low
    2; low - moderate
    Uncommon
    Cultivating, overgrazing, road building and other earth-moving activities, rabbit burrowing, trafficking by stock and vehicles.
    Increased run-on and sedimentation in lowest areas
    Increased physical pressure on soil
    Increased compaction

    With

    Reduced infiltration
    Structure decline



    Waterlogging
    1,2; low



    1; low - moderate
    Uncommon



    Common; localised areas
    Increased trafficking, cultivation, overgrazing, export of organic matter

    As for structure decline
    above
    -



    Increased run-on and ponding of water in low-lying areas
    Increased soil disruption
    Increased soil break-up
    Gully erosion
    2; low - moderate
    Uncommon
    As for sheet and rill erosion above
    Increased sediment load and turbidity in steams
    Comments: A salt-affected area occurs to the south of Rosedale; other occurrences are few and scattered.
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