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Wollaston (Wo)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Wollaston- geoArea: 28 sq. km (0.1%)

Wollaston land system is found in the area surrounding the Gippsland Lakes in association with Clydebank and Morass land systems. The main components are sand dunes and intervening, often swampy, flats similar to, though smaller than, swamps mapped in Morass land system. The geomorphic history is obscure. The dunes are possibly the result of reshaping of the prior and inner barrier systems during the last major sea level fall. The intervening flats may have a more recent lacustrine or paludal origin. Wollaston and Tyers land systems are similar in that they are composed of dunes with intervening flats but they differ in geomorphic history and Wollaston has a slightly drier climate.

Where the sands are deep, the soils are acidic, infertile and droughty, with dark topsoils and bleached subsurfaces. Iron and/or humus-enriched pans occur at depth. Elsewhere, clays and silts underlie a relatively thin cover of sand, producing duplex soils with mottled, sodic clay subsoils.

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Wollaston- image
Low dunes and relict lacustrine flats with
Melaleuca ericifolia (swamp paper-bark) growing in wet depressions
The vegetation on the dunes is a ferny open woodland I dominated mainly by E. viminalis var. racemosa and Banksia spp. The less sandy swales carry a woodland I of E. tereticornis. The deeper depressions, which are often inundated, have a zonation of vegetation towards the centre.

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

Annual 500 - 800; lowest January (30 - 50), highest October (40 - 70)

Annual 12 - 14; lowest July (9 - 10), highest February (19 - 20)
Temperature <10C (av.): July
Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology

Pleistocene barrier deposits of sands; Holocene lacustrine fill of sands and clays and minor paludal fills
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

Sand dunes and intervening flats and stranded beach lines

0 - 20
0 - 20
Deranged
0.1
PRESENT LAND USEMostly uncleared: areas in The Lakes National Park, Lake Coleman, Dowd Morass and Blond Bay State Game Reserves; apiculture; grazing of sheep and cattle
(limited)

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
45
Dunes
2
45
Relict lacustrine flats and stranded beach
lines
3
10
Depressed, wet, saline, inter-dune areas
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
5- 10, (2- 15)
Convex
<1, (0- 2)
Straight
<1, (0- 2)
Concave
SOIL
Parent material
Wind-sorted sand of marine origin
Lacustrine sand and clay
Wind-sorted sand of marine origin
Description
Single observation but predictably dark sand over grey sand with coffee rock or bright yellowish brown sand below
Single observation — black sand over grey sand with mottled alkaline clay below. Possibly other soils
No observations — probably black acid sand
over grey sand, possibly with coffee rock at
depth where water table is deeper
Classification
Podzols
Uc4.32 or Uc4.22
Solodic Soils
Dy5.23
Humic Gleys, possibly some Podzols
-
Surface texture
Sand
Loamy fine sand
Sand
Surface consistence
Loose or soft
Soft
Soft
Depth (m)
>2.0
>2.0
>2.0
Nutrient status
Very low
Low
Very low
Available soil water capacity
Very low
Low
Low
Perviousness to water
Very rapid
Slow
Very rapid
Drainage
Somewhat excessive
Poor to somewhat poor
Very poor to poor
Exposed stone (%)
0
0
0
Sampled profile number
-
-
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Ferny open woodland I:
E. viminalis var. racemosa+ with Banksia serrata+ or B. integrifolia (near lake shore) and Pteridium esculentum
Woodland I:
E. tereticornis+
Zonation of vegetation with, from margins inwards:
Closed scrub of Melaleuca ericifolia+
Rushland of Juncus maritimus+
Herbfield of Salicornia spp.+
Centres often with free water

Disturbance
Affected process and trend
Primary resultant deterioration
Causal activities
Primary off-site process
Form
Susceptibility of
components
Incidence within
components
Alteration of vegetation:
— reduction in leaf area, rooting depth and/or perenniality
Reduced transpiration,
resulting in increased deep percolation and leaching
Nutrient loss1; highNot determinedRemoval of treesIncreased movement of water to groundwater; increased base-flow of streams
Increased exposure of surface soilIncrease wind velocity over soil and increased detachment of sandWind erosion1; highUncommon; local occurrenceClearing, burning, road building and other earth-moving activities, trafficking by stock and vehicles.Encroachment by sand
Increased physical pressure on soilIncreased compactionStructure decline1; very low
2; low
3; low - moderate
UncommonIncreased trafficking, cultivation, overgrazing, export of organic matter-
Increased soil disruptionIncreased loosening of sandWind erosion1; highAs for wind erosion
above
As for wind erosion aboveEncroachment by sand
Comments: Regeneration of vegetative cover on the dunes is usually slow because of soils with low fertility and exposure to wind
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