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Talbotville (Te)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Talbotville- geoArea: 2954 sq. km (14.5%)

Talbotville land system occurs on the extensive Ordovician, Devonian and Silurian sediments in the East Victorian Uplands. The mountainous ridge-and-ravine terrain has long, steep slopes on which soil creep and other slope processes are active. Rock outcrop is abundant. Major valleys such as those of the Mitchell, Nicholson, Wongungarra and Wonnangatta Rivers have levees and alluvial terraces similar to, but smaller than, those mapped in Walnut land system.

The land is similar in geology and topography to the Birregun land system but the climate is much drier and elevations tend to be slightly lower.

Steep slopes, slow-weathering sedimentary rocks and rainfall, inadequate to support vigorous and dense vegetation, give rise to active, natural erosion and slow soil formation. Thus the soils tend to be shallow, stony, leached, acidic and weakly structured. They would be prone to severe sheet erosion if denuded of vegetation.

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Talbotville- image
In ridge-and-ravine topography, most drainage channels have little alluvium due to the rate of removal being greater than the rate of deposition. Some of the major river, however, have alluvial terraces as, for example, can be seen along the Wonnangatta River where it traverses Talbotville land system.
Several vegetation types are found due to the wide geographic and elevation range. Woodland I and II dominate on the drier slopes while open forest I and II are found in more humid areas, notably on protected slopes at higher elevations.

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

    Annual 800 - 1400; lowest January or February (40 - 80), highest October (100 - 150)

    Annual 8 - 12; lowest July (3 - 7), highest February (16 - 20)
    Temperature <10C (av.): April - October
    Rainfall < potential evapotranspiration: December - February; occasional winter snow
GEOLOGY
Age, lithology
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Steep mountains with ridge-and-ravine topography

    80 - 1300
    120 - 720
    Dendritic
    2.0
PRESENT LAND USE
    Mostly uncleared: hardwood forestry (second quality timber in sheltered areas); bush grazing of cattle (very limited); small area in Baw Baw National Park

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
85
Slopes with drier woodland and forest
2
10
Slopes with more humid forest, usually on
protected upper slopes
3
5
Discontinuous narrow terraces and,
rarely, old terrace remnants along major
drainage corridors
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
35 - 45, (25 - 100)
Straight
35 - 45, (25 - 100)
Straight
<5, (0 - 10)
Straight but uneven
SOIL
Parent material
Mudstone, siltstone, sandstone and shale
Mainly locally derived alluvium
Description
Dark clay loam to loamy sand grading into
yellowish or reddish brown similar or
heavier-textured subsoil; shallow to very
shallow, stony and acidic
As in component 1, but topsoil tends to be
darker coloured and somewhat deeper
Mainly little differentiated sandy loam to
sandy clay loam; gradational or duplex soils
on old terrace remnants
Classification
Lithosols, some Red and Brown Earths
Um 1.42, Urn 1.43. Um6.13, Um4.31, Gn2.11, Gn2.61, Uc5.11, Uc5.21
Lithosols, minor Brown Earths and Red Podzolic Soils
Um6.12, Um4.22, Gn4.14
Alluvial Soils, Yellow Earths; Yellow
Podzolic Soils on old terrace remnants
Uc4.22, Uc4.31, Gn4.81, Dy3. -
Surface texture
Clay loam to loam, less commonly lighter textures
Loamy sand to sandy clay loam
Surface consistence
Slightly hard when dry friable when moist
Varies with texture
Depth (m)
<0.8, but commonly<0.5
>2.0
Nutrient status
Low
Low
Available soil water capacity
Low to moderate
Low to moderate
Perviousness to water
Moderate
Moderate
Drainage
Good
Varies with position in landscape
Exposed stone (%)
5 -60
0; high on ancient gravel deposits
Sampled profile number
11
-
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Because of wide geographic and altitudinal range, varies from woodland I to open forest II,
often shrubby or grassy: E. bridgesiana, E. dives, E. goniocalyx, E. melliodora, or E. sieberi usually predominant; E. rubida, E. macrorhyncha, E. pauciflora (at higher elevations) Rarely closed forest in minor drainage corridors: Acmena smithii+ with climbers, ferns and epiphytes
Open forest II, III, often shrubby: E. viminalis, E. radiata or E. goniocalyx usually predominant; E. macrorhyncha and, on old terrace remnants, E. cephalocarpa associated

    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




    — reduction in density of tree roots
    Reduced transpiration,
    resulting in:

    a) increased deep
    percolation




    b) increased regolith
    wetness



    Decreased root-binding



    Nutrient loss




    Landslip and soil creep




    Landslip and soil creep



    Not determined




    1; moderate
    2; high




    1; moderate
    2; high



    determined




    Common on steep
    slopes




    Common on steep
    slopes



    Removal of trees




    Accelerated by major disturbance to native vegetation


    Accelerated by major disturbance to native vegetation



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


    Increased sediment load
    Increased sediment load

    Increased exposure of surface soil
    Increased overland flow and soil detachment
    Sheet and rill erosion
    1,2; high
    Uncommon ; local incidence only
    Clearing, logging, burning, overgrazing, road building and other
    earth-moving activities, trafficking by stock
    Increased flash flows and sediment load.
    Increased physical pressure on soil
    Increased compaction

    With

    Reduced infiltration
    Structure decline



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



    1,2; high
    Uncommon



    Uncommon: local incidence only
    Increased trafficking export of organic matter

    As for sheet and rill erosion above
    -



    Increased flash flows
    Increased soil disruption
    Increased soil break-up
    Gully erosion

    Scour erosion

    Streambank erosion
    1,2; high

    3; high

    3; high
    Uncommon

    Uncommon

    Uncommon
    As for sheet and rill erosion above

    As for sheet and rill erosion above

    As for sheet and rill erosion above
    Increased sediment load

    Increased sediment load

    Increased sediment load
    Comments: -
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