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Soil/Landform Unit 183

Landform Unit Description

Unit 183 image a
Near-level plains south of Lake Gnarpurt
      Area: 433 ha
      0.03 % of CMA region

      This small singular unit with a sole component occurs south of Lake Gnarpurt and on the north-western shore of Lake Corangamite, with near-level sedimentary plains to the south (Unit 188). Land here has been extensively cleared with no remnant vegetation. The soils are alkaline (strongly sodic) mottled black texture contrast soils (Sodosols). Given the locality and topographic position, this unit is highly susceptible to waterlogging and compaction. Nutrient decline in the upper soil and structure decline (with increasing sodicity) are also concerns. Some surface soils may be friable.
Unit 183 geomorphology

Unit 183 image b
Wind erosion, waterlogging and compaction are the main degradation threats to this unit		Unit 183 cross section

Unit 183 graph

Component
1
Proportion of soil-landform unit
100%
CLIMATE
Rainfall (mm)

Annual: 590
Temperature (oC)
Minimum 8, Maximum 19
Precipitation less than potential evapotranspiration
October–March
GEOLOGY
Age and lithology
Neogene fluvial-marine sediments, Quaternary coastal sand dunes
Geomorphology
LANDUSE
Uncleared: Nature conservation
Cleared areas: Sheep and beef cattle grazing; water supply; cropping (cereal) in dry seasons
TOPOGRAPHY
Landscape

Level plains
Elevation range (m)
113–128
Local relief (m)
1–2
Drainage pattern
Centripetal
Drainage density (km/km2)
1.1
Landform
Landform element
Plains
Slope and range (%)
0 (0–1)
Slope shape
Straight
NATIVE VEGETATION
Ecological Vegetation Class
Plains Grassland / Plains Grassy Woodland Mosaic (0.4%), Grassy Woodland (0.3%), Swamp Scrub (0.1%)
SOIL
Parent material

Sand, clay and gravel
Description
(Corangamite Soil Group)
Acidic black texture contrast soils (14)
Soil type sites
SW99, SW93, MM204
Surface texture
Clay loam
Permeability
Low
Depth (m)
<2
LAND CHARACTERISTICS, POTENTIAL AND LIMITATIONS
Texture contrast, low nutrient holding capacity and water holding capacity in subsurface and surface soil, higher in subsoil. Acidic (not quite strongly).
Heavy, possibly expansive clay subsoil. Slow site drainage, susceptible to waterlogging and compaction.
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