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Perry (Py)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Perry- geoArea: 395 sq. km (1.9%)

Sand sheets and low dunes on the Tertiary and early Pleistocene terraces have been mapped in Perry land system.

Much of the sand was deposited by streams such as the Perry River, and subsequently blown eastwards from the flood plains during a dry glacial period. In areas to the south of Lake Wellington, which have suffered a marine inundation, longshore and beach drift appear to have moved the sand eastwards, shaping it into coastal and sea-floor forms.

Sandy soils are prevalent but they are underlain by clays at variable depths. Deep sands tend to he highly acidic, infertile and droughty, with dark topsoils, bleached subsurfaces and with iron and/or humus-enriched pans at depth. Where the underlying clay is shallow, drainage may be restricted. This clay commonly exhibits sodic properties.

The vegetation is mainly open woodland I and II, sometimes ferny or heathy, with open forest II on duplex soils and sedgelands in wet areas.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Perry- image
Woodland of
Eucalyptus nitida (shining peppermint) and Banksia serrata (saw banksia) growing on a relict beach ridge

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.): June - August
Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology

Pleistocene aeolian and marine sands
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

Sand sheets and low dunes

<2.0 - 120
0 - 10
Dendritic
0.1
PRESENT LAND USEMostly uncleared: hardwood forestry (minor timber products); apiculture: bush grazing of cattle (limited); small area in Moormurng Forest Park
Minor proportion cleared: grazing of cattle and sheep; softwood plantations

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

LAND COMPONENT
Percentage of land system
Diagnostic features
1
55
Low sand ridges formed by
modification of sand sheets
2
25
Thin sand sheets over clay
sub strata
3
10
Seasonally waterlogged swales and
margins to lagoons
4
10
Permanent lagoons
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
3, (0 - 5)
Convex and concave
2, (0 - 5)
Straight
<1, (0 - 2)
Straight or concave
0, (-)
Concave
SOIL
Parent material
Aeolian sand
Aeolian sand; marine — lacustrine
clay
Aeolian sand; marine — lacustrine
clay
-
Description
Dark sand over whitish sand
overlying coffee rock or bright
yellowish brown sand; yellow
sand below
Dark sand over paler sand overlying
mottled, often alkaline clay
Limited observations — black sand
over light grey sand often overlying
mottled clay
No soils
Classification
Podzols
Uc2.21, Uc2.36, Uc4.31, Uc4.32
Solodic Soils
Dy3.23, Dy5.23
Gleyed Podzolic Soils, Humic Gleys
Dd4.41, Uc1.41
-
Surface texture
Sand
-
Surface consistence
Loose or soft
-
Depth (m)
>2.0
-
Nutrient status
Very low
-
Available soil water capacity
Very low
-
Perviousness to water
Very rapid
Slow
Slow
-
Drainage
Somewhat excessive
Somewhat poor
Poor
-
Exposed stone (%)
0
0
0
-
Sampled profile number
73
-
-
-
NATIVE VEGETATION
Structure of vegetation and characteristic species of dominant stratum
(+ Predominant species)
Mainly ferny woodland or open woodland I, II: E. globoidea (in higher rainfall areas) or E. viminalis var. racemosa with Pteridium esculentum; Banksia serrata sometimes associated Heathy open woodland I on deeper sands of upper slopes: E. nitida+, B. serrata
Grassy or shrubby open forest II: With decreasing depth to clay — E. globoidea+, E. tereticornis+, E. bridgesiana+, E. ovata+; E. polyanthemos may be associated
Mainly sedgeland: Lepyrodia muelleri+, Lepidosperma longitudinale, Schoenus brevifolius
Occasionally open heath: Leptospermum juniperinum
Open forest I: E. ovata+ and/or E. cephalocarpa+
No vegetation

    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 and leaching
    Nutrient loss
    1; high
    2; low
    Not determined
    Removal of trees
    Increased movement of water to groundwater
    Increased exposure of surface soil
    Increased wind velocity over soil and increased detachment of sand
    Wind erosion
    1; high
    2; low
    Uncommon: local occurrence on exposed sites
    Clearing, cultivating, logging, burning, overgrazing, road building and other earth-moving activities, trafficking by stock and vehicles
    Encroachment by sand
    Increased physical pressure on soil
    Increased compaction
    Structure decline
    1,2; low
    3; low - moderate
    Uncommon
    Increased trafficking and cultivation, overgrazing, export of organic matter
    -
    Increased soil disruption
    Increased loosening of sand
    Wind erosion
    1; high
    2; low
    Uncommon: local occurrence on exposed sites
    As for wind erosion above
    Encroachment by sand
    Comments: Regeneration of vegetative cover is usually slow because of most of this land system has soils that are `droughty' and/or have low fertility
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