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Soil/Landform Unit 56

Landform Unit Description

Unit 56 image a
Level plain of the swamp north of Lal Lal. The vegetation stand in this photo represents a sandy ridge that surrounds the western fringe of the swamp
      Area: 464 ha
      0.03% of CMA region

      This vast swamp located near Lal Lal comprises Quaternary clay and sands in the north-east of the Corangamite catchment. Here much of the land has been cleared with very little remnant vegetation. The vegetation class is Aquatic Herbland/Plains Sedgy Wetland Mosaic with the dominant species Eucalyptus ovata. The sedimentary sands and clay have a low inherent fertility and low water holding capacity. Land use is mainly restricted to grazing owing to the waterlogged state of soil in most years. Soils include acidic mottled texture contrast soils with areas of alkaline grey cracking clays. While waterlogging is a major limitation, soil compaction is also a limitation for production of crops with shallow topsoils.
Unit 56 geomorphology

Unit 56 image b
Land use on the plains is limited to grazing		Unit 56 cross section

Unit 56 graph

Unit 56 image c
Eucalyptus ovata is the main remainin
Eucalyptus species of the swamp

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

Annual: 760
Temperature (oC)
Minimum 7, Maximum 17
Precipitation less than potential evapotranspiration
November-March
GEOLOGY
Age and lithology

Quaternary clay and sand, minor Neogene sand
Geomorphology
LANDUSE
Uncleared: Nature conservatin, water supply
Cleared: Grazing, occasional cropping (cereal)
TOPOGRAPHY
Landscape

Swamp
Elevation range (m)
420-475
Local relief (m)
1
Drainage pattern
Dendritic
Drainage density (km/km2)
1.3
Landform
Swamps and depressions
Landform element
Slope and range (%)
1
Slope shape
Flat
NATIVE VEGETATION
Ecological Vegetation Class

Aquatic Herbland/Plains Sedgy Wetland Mosaic (7.8%)
Dominant species
E. ovata
SOIL
Parent material

Unconsolidated sands, silts and clays
Description
(Corangamite Soil Group)
Mottled dark grey, brown gradational soil (34) and black cracking clay soil, coarse structure (31)
Soil type sites
Surface texture
Light clay/clay
Permeability
Low
Depth (m)
2
LAND CHARACTERISTICS, POTENTIAL AND LIMITATIONS
Slowly permeable soils and hardsetting surfaces result in significant waterlogging. Soil compaction is also a limitation for soils with shallow topsoils.
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