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Bindi (Bi)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Bindi- geoArea: 27 sq. km (0.1%)

This land system is confined to an area of Devonian calcareous marine sediments interbedded with siltstones, at low elevations in the north-east of the survey area. Broad alluvial floors (the broadest of which are mapped in Walnut land system) and colluvial fill on lower slopes are characteristic. Topography ranges from low hills to undulating terrain, with rock outcrop on some strike ridges. Secondary, calcareous accumulations occur on some breaks-of-slope.

Shallow, reddish brown clays with fine structure have developed under low to moderate rainfall on the calcareous and silty, siliceous parent rocks. Lime is often present in the soil close to the surface and the reaction is usually neutral in the topsoil and alkaline at depth. The shallowness of the soil leads to low water-holding capacity and periodic water stress.

Now almost entirely cleared, the original vegetation was probably mainly a grassy woodland II, with open forest II on lower colluvial slopes and alluvial terraces.

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Bindi- imageCleared low hills and undulating terrain adjacent to the forested slopes of Blomford land system

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.): May - September
    Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology

    Devonian; Taravale Formation, Buchan Group; siltstones with interbedded limestones, sometimes nodular
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Low hills and undulating terrain

    400 - 700
    80 - 120
    Dendritic
    1.3
    PRESENT LAND USE
Mostly cleared: mainly grazing by beef cattle and sheep, mostly on improved pastures

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
55
Long gentle slopes
2
20
Short steeper slopes normal to strike with outcrop of calcareous rock
3
15
Lower slopes and some fans with deep soils
4
10
Valley flats
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
10 - 20, (5 - 30)
Concave, some convex
20 – 30, (10 - 40)
Straight
5, (2 - 15)
Concave
<2, (0 - 5)
Straight but uneven
SOIL
Parent material
Siltstone and interbedded limestone
Colluvium and local alluvium
Alluvium
Description
Shallow reddish brown granular or fine blocky structured clay, often stony
Alternating rock outcrop and very shallow soil, otherwise similar to component 1
Variable; deep reddish brown fine blocky clay: dark grey mottled clay where drainage poor
Limited observations — black sandy clay loam to clay loam over stratified alluvium of variable texture
Classification
Euchrozems
Gn3.13
Euchrozems
Um6.24
Terra Rossas. Solodic Soils
Gn3.15. Dy3.23
Alluvial Soils
Um6.22
Surface texture
Clay loam
Clay loam
Loam to clay loam
Medium textures
Surface consistence
Very hard when dry
Very hard when dry
Hard to very hard when dry
Very hard when dry
Depth (m)
Mostly 0.4 - 0.8
<0.4, some deeper pockets
>2.0
>2.0
Nutrient status
Moderate
Moderate
Moderate
Moderate to high
Available soil water capacity
Moderate
Moderate
Moderate
Moderate
Perviousness to water
Slow
Slow
Slow
Slow to moderate
Drainage
Good
Good
Variable: somewhat poor to good
Good
Exposed stone (%)
Generally 0
Generally 0
0
0
Sampled profile number
-
-
33
-
NATIVE VEGETATION
Structure of vegetation and characteristic species of dominant stratum
(+ Predominant species)
Grassy woodland II:
E. pauciflora+. E. viminalis
Grassy woodland II:
E. pauciflora+
Open forest II:
E. goniocalyx+. E. polyanthemos
Limited data — probably open
forest II with E. viminalis

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 lossNot determinedNot 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 erosion1,2,3; moderate - highCommon
    Clearing, cultivating, 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
12.3.4; moderate



12,3.4; moderate - high
Common on the gentler slopes



Common
    Increased trafficking and cultivation, overgrazing, export of organic matter

    As for sheet and rill
    erosion above
    -



    Increased flash flows
    Increased soil disruption
    Increased soil break-up
Gully erosionI; moderate
2; low
3,4; high
Common
    As for sheet and rill erosion above
    Increased sediment loam
Comments: Vegetative cover regenerates only slowly, particularly on exposed aspects because of hot, dry summers and autumns.
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