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Jamieson (Jn)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Jamieson- geoArea: 109 sq. km (0.8%)

During late Tertiary and Pleistocene times major rejuvenation of drainage and hillslopes occurred through most of the East Victorian Uplands. However, some north-south trending interfluves have not yet been dissected by the modern drainage network and prior landscape residuals, probably pre-dating the Older Volcanics, are preserved. Those mapped in Jamieson land system are relatively undissected plateaux, mainly on Ordovician sediments, at high elevations but below the subalpine tract. Residuals within the subalpine tract are in Bennison land system. More dissected residuals are in Bulltown Spur land system and those with denser, more-humid forests in Wellington land system.

The dominant gentle slopes reduce natural erosion rates and relatively deep soils have resulted from the weathering of moderately-resistant parent rocks under high rainfall and a cool climate. The soils tend to have a well-developed, fine structure and are moderately to strongly acidic.

The dominant vegetation is open forest II or III, often shrubby or layered, with ferny open forest I or sedgey woodland I on valley floors.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Jamieson- image
Steeper, timbered slopes typical of the peripheral sloping areas

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

Annual 800 - 1400; 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: December - February; occasional winter snow
    GEOLOGY
    Age, lithology

Mainly
Ordovician mudstones and sandstones
    PHYSIOGRAPHY
    Landscape
    Elevation range (m)
    Relative relief (m)
    Drainage pattern Drainage density (km/km2)

Relatively undissected prior landscape remnants, mainly pre-dating the Older Volcanics

400 – 1360
40 – 320
Dendritic
1.1
    PRESENT LAND USE
Uncleared: hardwood forestry (variable timber); bush grazing of cattle; apiculture

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

    LAND COMPONENT
    Percentage of land system
    Diagnostic features
1
70
Undulating and sloping plateaux remnants with less humid forest then in component 3
2
15
Peripheral steeper slopes with less humid forest than in component 3
3
10
Protected slopes with vigorous humid forest
4
5
Valley flats
    PHYSIOGRAPHY
    Slope %, typical and (range)
    Slope shape
8-15 (0-20)
Straight or slightly convex
25-30 (20-40)
Convex
15-25 (10-40)
Straight
<5 (0-10)
Concave, straight
    SOIL
    Parent material
Mudstone, sandstone; some metamorphic rock
Colluvium and locally derived alluvium
    Description
Black to dark brown loam to clay loam grading into reddish brown or brown loam to light clay, acid and usually finely structured throughout; sometimes shallow and stony, particularly in component 2.
Limited observations – as in components 1 and 2 but thicker dark coloured topsoil; shallow soil less common
Dark greyish brown to dark grey sandy loam to sandy clay loam; mottled subsoil
    Classification
Red and Brown Earths; less commonly, Lithosols
Gn2.11, Gn2.21, Gn4.14, Um6.13, Um6.24, Um5.52
Krasnozems
Gn4.11
Alluvial Soils; possibly Humic Gleys
Um6.23, Gn4.51
    Surface texture
Loam to sandy clay loam
Loam to sandy clay loam
Sandy loam to sandy clay loam
    Surface consistence
Friable to firm when moist
Friable to firm when moist
Very friable when moist
Variable
    Depth (m)
1.2-1.8
<0.8
>1.2
>2.0
    Nutrient status
Low to moderate
Low to moderate
Low to moderate
    Available soil water capacity
Moderate
Moderate
High
    Perviousness to water
Rapid
Rapid
Rapid
    Drainage
Good
Good
Poor to somewhat poor
    Exposed stone (%)
Usually 0
0
0
    Sampled profile number
-
36
-
    NATIVE VEGETATION
    Structure of vegetation and
    characteristic species of
    dominant stratum
    (+ Predominant species)
Open forest II, III, often shrubby or layered: E. pauciflora and E. rubida, with or without E. dives, at highest elevations; elsewhere, pure or mixed stands with species including E. dives, E. rubida, E. obliqua, E. baxteri
Limited observations – probably layered open forest III:
Higher elevations –
E. delegatensis+; with or without E. rubida+
Lower elevations – E. obliqua+, with or without E. regnans
Sedgey woodland I:
E. camphora, Carex appressa

Occasional fern open forest I:
E. neglecta

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 percolationNutrient lossNot determinedNot determinedRemoval of treesIncreased movement of water to groundwater; increased base-flow of streams
    Increased exposure of surface soil
Increased overland flow and soil detachmentSheet and rill erosion1,3; low
2; moderate
Not determinedClearing, logging, burning, road building activities, trafficking by stock and vehicles.Increased flash flows and sediment load. and other earth-moving
    Increased physical pressure on soil
Increased compaction

With

Reduced infiltration
Structure decline


Sheet and rill erosion
1,2; low
3,4; moderate – high

1,3; low
2; moderate
Not determined



Not determined
Increased trafficking, overgrazing, export of organic matter

As for sheet and rill erosion above
-



Increased flash flows
    Increased soil disruption
Increased soil break-upGully erosion1; low
2,3; moderate
Not determinedAs for sheet and rill erosion aboveIncreased sediment load.
Comments: No observations of soil deterioration
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