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Elizabeth (Eh)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Elizabeth- geoArea: 175 sq. km (0.9%)

Elizabeth land system occurs at relatively high elevation but below the subalpine tract, mainly in the northern parts of the East Victorian Uplands and along the major interfluves of the acid volcanics, mainly the Wellington Rhyolites and the Snowy River Volcanics. The terrain is mountainous with ridge-and-ravine topography and long, steep slopes, occasionally leading down to major streams, notably the Wellington River.

The land is similar in geology and topography to Carrabungla land system but it is much more humid, particularly in the west.

High rainfall in a cool climate and parent rocks that weather relatively easily have produced moderately-deep soils except on very steep slopes. The soils are well-aggregated and have a crumb or granular structure in the upper horizons but may become massive and earthy in the subsoil. They are moderately acidic and permeable.

The vegetation is mainly shrubby open forest II or III. On the protected upper slopes, mostly at higher elevations, the forests are often layered and have species indicative of humid conditions.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Elizabeth- image
Slopes with shrubby open forest of box and stringybark species typical of component 1.

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

Annual 800 - 14(X): lowest January or February (50 - 90), highest August or September (120 - 180)

Annual 8 - 12; lowest July (3 - 7), highest February (16 - 20)
Temperature <10C (av.): April - October
Rainfall < potential evapotranspiration: January. February; occasional winter snow
GEOLOGY
Age, lithology

Devonian rhyolites and rhyodacites (Wellington Rhyolites and Snowy River Volcanics)
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

Steep mountains with ridge-and-ravine topography

180 - 1520
120 - 540
Dendritic
1.0
PRESENT LAND USEUncleared: hardwood forestry (mainly for general construction); apiculture; summer hush grazing of cattle; recreation — bushwalking

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
80
Exposed slopes and ridges
2
20
Protected upper slopes
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
30 - 40. (10 - 60)
Straight
30 - 40, (10 - 60)
Straight
SOIL
Parent material
Rhyolite and rhyodacite
Rhyolite and rhyodacite
Description
Brown sandy loam to clay loam merging into sometimes stony red or
brown sandy clay loam to clay loam
Black sandy loam to clay loam merging into sometimes stony brown
sandy clay loam to clay loam
Classification
Brown and Red Earths. some Lithosols
Um5.52, Gn2.41
Brown Earths, some Lithosols
Um6.21, Um7.11
Surface texture
Sandy loam to clay loam
Surface consistence
Soft to slightly hard
Depth (m)
<1.5
Nutrient status
Low to moderate
Available soil water capacity
Moderate
Perviousness to water
Rapid
Drainage
Good
Exposed stone (%)
<15
Sampled profile number
-
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Shrubby open forest II. III:
E. obliqua+ or E. sieberi+; E. polyanthemos and E. muellerana often associated
Open forest III (often shrubby or layered):
E. delegatensis+, often with E. rubida. Possibly replaced by E. regnans+ and E. obliqua at lower elevations

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




    Soil creep


    Soil creep



    Not determined




    1,2: high


    12; high



    Not determined




    Not determined


    Not determined



    Removal of trees




    Accelerated by clearing
    of native vegetation

    Accelerated by clearing
    of 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
    12; high
    Not determined
    Clearing, logging,
    burning, overgrazing,
    road building and other
    earth-moving activities.
    Increased flash flows
    and sediment load.
    Increased physical pressure on soil
    Increased compaction

    With

    Reduced infiltration
    Structure decline



    Sheet and rill erosion
    1,2; low - moderate



    1.2: high
    Not determined



    Not determined
    Reduced organic matter
    in topsoil


    As for sheet and rill
    erosion above
    -



    Increased flash flows
    Increased soil disruption
    Increased soil break-up
    Gully erosion
    12; high
    Not determined
    As for sheet and rill
    erosion above
    Increased sediment load.
    Comments: No observations of deterioration
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