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Nuntin (Nt)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Nuntin- geoArea: 38 sq. km (0.2%)

This small land system occurs in what were probably the downstream parts of prior stream systems on the later Pleistocene terrace. Raised alluvial ridges of generally sandy materials alternate with clay flats. Bedding layers are clearly evident in some of the sandier deposits south-west of Sale. East of Sale the deposits tend to be medium-textured and near Lake Wellington they merge with the sand deposits of Clydebank land system. Some aeolian deformation of the sandier deposits has occurred.

Fine sediments dominate but there are areas of sands. Generally the materials are of Holocene age and have undergone little soil formation beyond the accumulation of organic matter in the topsoil and the development of mottles in the less well-drained subsoils. The deeper subsoils tend to be neutral or alkaline in reaction but the topsoils have been sufficiently leached to be moderately or mildly acidic.


A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Nuntin- image

A very gently undulating plain, the predominant terrain of Nuntin land system
As the groundwater generally occurs between 1 and 2 m below the surface, and tends to be moderately to highly saline, there is a moderate salinity hazard.

The native vegetation, probably an E. tereticornis grassy woodland II, or ferny woodland II on deeper sands, has been almost entirely removed.

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 and some aeolian sand deposits
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

Alluvial rises, occasionally with aeolian deformation, and intervening clay floors

0 - 20
0 - 5
Dendritic
0.3
PRESENT LAND USECleared: grazing of cattle and sheep; mining of sand deposits

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
60
Gently undulating plains
2
40
Rises, often dune-like
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
1 - 2, (0 - 4)
Various
3 - 5, (0 - 8)
Convex
SOIL
Parent material
Alluvium of variable texture and aeolian sand
Description
Variable; greyish brown siliceous sand over buried clay; black to
dark greyish brown clay loam, light clay or lighter textured topsoil
grading into mottled brown or grey clay subsoil; may be calcareous
Single observation — greyish brown sand or loamy sand becoming more
reddish brown or yellowish red with depth. Soils possibly calcareous
Classification
Wiesenboden, Siliceous Sands
Gn3.23, Gn4.53, Gn4.82, Um2.21, Uc4.32, Uc5.23
Alluvial Soils
Uc1.23
Surface texture
Variable
Sand or loamy sand
Surface consistence
Variable
Soft or loose when dry, friable when moist
Depth (m)
>2.0
>2.0
Nutrient status
Moderate, sometimes low
Low
Available soil water capacity
Moderate, sometimes low
Low
Perviousness to water
Moderate to rapid
Rapid
Drainage
Somewhat poor
Good
Exposed stone (%)
0
0
Sampled profile number
20
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Grassy woodland II or, on deeper sands, ferny woodland II:
E. tereticornis+

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 and leaching



    b) raised saline
    groundwater table



    Nutrient loss




    Salting



    1; low
    2; moderate



    1; moderate



    Not determined




    Common



    Removal of trees




    Removal of trees



    Increased movement of water to groundwater; increased base-flow streams

    Increased movement of water to groundwater; increased base-flow streams

    Increased exposure of surface soil
    Increased wind velocity over soil and increased detachment of sand
    Wind erosion
    2; moderate
    Uncommon
    Road dam building and other earth-moving activities, trafficking by stock and vehicles, cultivating.
    Encroachment by sand
    Increased physical pressure on soil
    Increased compaction

    With

    Reduced infiltration
    Structure decline


    Waterlogging
    1; moderate



    1; moderate
    Uncommon



    Common
    Increased trafficking cultivation, overgrazing, export of organic matter

    As for structure decline
    above
    -



    Increased ponding of water in lower areas
    Increased soil disruption
    Increased loosening of sand
    Wind erosion
    2; moderate
    Uncommon
    As for wind erosion above
    Encroachment by sand
    Comments: Salting has been recorded in an area west of Lake Wellington
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