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Tambo (Tb)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Tambo- geoArea: 400 sq. km (2.0%)

Low hills and undulating terrain occur on Ordovician sediments at low elevations close to the southern margin of the East Victorian Uplands and along some of the major river valleys. These areas are mapped as the Tambo land system. Some ridge crests are rounded but most slopes are short and moderately steep. Occurring in scattered localities, this land system is ecologically diverse. The area is topographically similar to the Avon land system on Carboniferous sediments.

Shallow soils, with rock fragments common, particularly in the lower horizons, have formed on the moderate and gentle slopes. Soil depth appears to be limited by rock strata that is resistant to weathering. The soils typically show increasing clay content with depth, the increase appearing to be more gradual than abrupt. The reaction is moderately to strongly acidic, often tending to neutrality at depth.

Open forest II predominates, with open forest III on some protected slopes.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Tambo- image
The low relief on the rounded hill is apparent when compared with the ridge (right background) of
Talbotville land system.

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

    Annual 700 - 1200; lowest January or February (40 - 80), highest October (100 - 150)

    Annual 12 - 14; lowest July (8 - 10), highest February (19 - 21)
    Temperature <10C (av.): May - September
    Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Rounded low hills and undulating terrain

    40 - 540
    40 - 160
    Dendritic
    0.5
PRESENT LAND USE
    Mostly uncleared: hardwood forestry (low productivity except for second grade timber on sheltered slopes); apiculture; bush grazing of cattle (limited); small area in Fairy Dell Scenic Reserve
    Cleared areas: grazing of cattle on improved pastures

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
45
Steeper slopes and
sharp or sub-rounded
peaks
2
30
Gentle lower slopes
3
5
Broad rounded crests
4
10
Protected slopes
5
5
Minor drainage
depressions
6
5
Terraces in
major drainage
corridors
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
20 - 30, (10 - 40)
Straight
10 - 15, (5 - 20)
Concave
5, (0 - 10)
Convex
20 - 30, (10 - 40)
Concave
<2, (0 - 5)
Concave
<5, (0 - 10)
Straight but uneven
SOIL
Parent material
Sandstone, mudstone and shale
Colluvium and local
alluvium
Alluvium
Description
Very dark greyish brown loamy sand to loam topsoil; gradual or abrupt change to yellowish
brown or reddish brown, sometimes mottled, clay subsoil, usually with blocky structure.
Commonly stony, sometimes shallow, probably depending on hardness of underlying rock
and slope
Variable; sand to
clayey texture;
greyish brown, often
mottled; may be stony
Limited observation —
undifferentiated brown
sand
Classification
Yellow Podzolic Soils; some Red Podzolic Soils and Brown Earths; rarely Lithosols
Gn3.21, Gn3.54, Gn2.41, Gn2.44, Gn3.11 Dy3.21, Dy3.41
Humic Gleys, Siliceous
Sands
Gn3.91, Uc1.23
Alluvial Soils
Uc1.23
Surface texture
Loamy sand to loam
Variable
-
Surface consistence
Variable; soft to hard when dry
Variable
-
Depth (m)
0.9 - 1.5; <0.9 where hard bedrock and/or steeper slopes
>2.0
>2.0
Nutrient status
Low to moderate
Low to moderate
Low to moderate
Available soil water capacity
Moderate
Very variable
Very variable
Perviousness to water
Mostly slow
Very variable
Very variable
Drainage
Good
Moderately good to good
Somewhat poor to good
Good
Mostly poor
Mostly good
Exposed stone (%)
Generally 0, but up to 20 where soil shallow
0
0
Sampled profile number
-
-
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Open forest II:
Shrubby open forest
I and II:
Open forest II, III
often shrubby:
Mostly open forest II:
E. ovata+, E. bridgesiana or E. polyanthemos, some times with E. radiata Rarely closed forest II: Acmena smithii, Pittosporum undulatum, climbers, ferns and epiphytes
Limited data — open forest II: E. viminalis+
E. globoidea usually predominant, occasionally E. polyanthemos or E. consideniana (in poorer drained sites); E. cypellocarpa or E. sideroxylon sometimes associated
E. cypellocarpa+ and/or E. obliqua+; E. radiata or E. globoidea often 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
    Reduced transpiration,
    resulting in increased deep percolation
    Nutrient loss
    Not determined
    Not determined
    Removal of trees
    Increased movement of water to groundwater; increased base-flow of streams
    Increased exposure of surface soil
    Increased overland flow and soil detachment
    Sheet and rill erosion
    1,2,3; moderate
    4; low
    Common: on cleared land. Local occurrences in forests
    Clearing, logging, burning, overgrazing, road and dam building and other 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
    1,2,3,4; low
    5,6; low – moderate

    1,2,3; moderate
    4; low
    Uncommon



    Uncommon
    Increased trafficking cultivation, overgrazing, export of organic matter

    As for sheet and rill
    erosion above
    -



    Increased flash flows
    Increased soil disruption
    Increased soil break-up
    Gully erosion
    1,2,3; low - moderate
    5; moderate
    4,6; low
    Uncommon: local occurrence
    As for sheet and rill erosion above
    Increased sediment load
    Comments: -
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