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Maffra 2 (M2)

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Maffra2- geoArea: 78 sq. km (0.4%)

The highest parts of the modern flood plains with a less active flood regime and with relatively uniform materials are mapped as Maffra 2 land system. The plains arc almost flat, with few channels or levees, and the alluvium tends to be clayey and relatively pervious.

Generally the length of time since deposition of alluvium and the high organic matter production due to high moisture availability and nutrient-rich parent materials have allowed the development of two different soil types; those with good drainage and those with poorly-drained subsoils. Both of these have friable, black to very dark greyish brown topsoils, rich in organic matter. Soil development has been similar to that in Maffra I land system. but the lower frequency of the poorly-drained soils in Maffra 2 may he explained by the better permeability and/or deeper ground water.

The soils are generally fertile and have a low erosion hazard, but are susceptible to compaction, particularly when wet.

As in Maffra 1, the native vegetation has been almost completely cleared. It was probably also an E. tereticornis grassy open forest II.
A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Maffra2- image
A broad. almost flat flood plain without active or relict channels. typical of Maffra 2 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.): June - August
    Rainfall < potential evapotranspiration: November – March
GEOLOGY
Age, lithology
PHYSIOGRAPHY
Landscape
Elevation range (m)
Relative relief (m)
Drainage pattern
Drainage density (km/km2)

    Almost flat, partly active alluvial plains

    20 - 40
    0 - 5
    Irregular and braided
    1.3
PRESENT LAND USE
    Cleared: grazing of beef and dairy cattle on improved, often irrigated pastures; some cropping: apiculture

A study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Maffra2- csA study of the land in the Catchment of Gippsland Lakes - Vol 2 - land system Maffra2- graph

LAND COMPONENT
Percentage of land system
Diagnostic features
1
10
Fans and aprons
2
80
Broad, almost flat flood plains
3
10
Mainly relict flat bottomed channels
PHYSIOGRAPHY
Slope %, typical and (range)
Slope shape
4, (3 - 5)
Straight to concave
1, (0 - 2)
Straight
<2, (0 - 3)
Concave
SOIL
Parent material
Clayey and silty alluvium
Description
Mostly clayey and silty colluvium from adjacent land systems
Probably mainly black to very dark friable silty loam to clay loam grading into greyish brown to reddish brown clay loam to light clay subsoil
Probably mainly greyish brown topsoil merging into grey. strongly mottled subsoil; textures similar to component 2
Classification
Probably mainly greyish brown loam to clay loam changing abruptly to mottled yellowish brown blocky alkaline clay subsoil
Prairie Soils, some Wiesenboden
Um5.52. Uf6.12
Wiesenboden/Humic Gleys
Gn3.53
Surface texture
Solodic Soils, sometimes strongly gleyed
Dy3.13, Dy3.23
Silty loam to clay loam
Fine and medium textures
Surface consistence
Loam to clay loam
Friable when moist
Friable to firm when moist
Depth (m)
Firm when moist
>2.0
>2.0
Nutrient status
>2.0
Moderate to high
Available soil water capacity
Moderate
Moderate to high
Perviousness to water
Moderate
Slow to moderate
Drainage
Slow
Moderately good to good
Very poor to poor
Exposed stone (%)
Poor to somewhat poor
0
0
Sampled profile number
0-
-
-
NATIVE VEGETATION
Structure of vegetation and
characteristic species of
dominant stratum
(+ Predominant species)
Grassy open forest II:
E. tereticornis+
Clearing has made it difficult to determine if any other predominant or associated tree species

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 leachingNutrient lossNot determinedNot determinedReduced plant-water useIncreased movement of water to groundwater; increased base-flow of streams
Increased exposure of surface soilIncreased overland flow and soil detachmentSheet and rill erosion2,3; very low
1; low
Uncommon; localised occurrencesCultivating, overgrazing, road and dam building and other earth-moving activities, trafficking by stock and vehicles.Increased flash flows, sediment load and turbidity of streams.
Increased physical pressure on soilIncreased compaction

With

Reduced infiltration
Structure decline


Sheet and rill erosion
1.3; moderate
2; moderate-high


2,3; very low
1; low
Not determined



Not determined
Increased trafficking cultivation, overgrazing, export of organic matter.

As for sheet and rill erosion above
-



Increased flash flows
Increased soil disruptionIncreased soil break-upGully erosion1,3; very low
2; low
UncommonAs for sheet and rill erosion aboveIncreased sediment load.
Comments: Disturbances on adjacent land systems do contribute to sheet, rill and gully erosion.
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