Subsoil Carbonate

Dataset Number1039
Dataset TitleSubsoil Carbonate
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water

Description

DescriptionSoils containing carbonates of calcium, and to a lesser extent magnesium, are widespread across southern South Australia, particularly in the less than 400 mm rainfall zone. They can occur as finely divided segregations mixed with sand and clay particles; as hard nodules or concretions (rubble); or as sheet rock or calcareous hardpan (calcrete). Fine carbonates reduce the availability of several nutrients, restrict the performance of a range of crops and pastures, and retard the breakdown of some herbicides. These effects are amplified in very highly calcareous soils. Hard carbonates reduce available waterholding capacity, and in the case of calcrete, limit rootzone depth. Three Subsoil Carbonate analysis data classes (depth to very highly calcareous material (strong reaction to 1 M HCl)) have been supplied, as percentage values of Soil Landscape Map Units to be used for the calculation of spatial data statistics. Note: the sum of all proportional values for each map unit totals 100%. Depth to highly calcareous subsoils (ie fine carbonate in the soil matrix) may vary significantly across the landscape. Each Soil Landscape Map Unit is categorised into legend categories (CARB_SUB) according to the proportion of its area with highly calcareous subsoils within 30 cm of the surface. A further subdivision is made to highlight land where highly calcareous subsoils occur within 60 cm of the surface. A total of eight legend categories (including not applicable) have been supplied.
UsageLink to Soil Attribute Descriptions.. This dataset has been derived from the Soil Landscape Map Units spatial dataset to be used for map creation or the calculation of spatial data statistics. Used to supply Government, community groups, industry and the general public with up to date regional, subregional and catchment level land and soil attribute information for southern South Australia. The aim is to produce maps, statistics and reports displaying and describing: Land and soil attributes within southern South Australia; Land surface features affecting land use, land management and productivity; Limitations / suitability of land and soil for a range of agricultural and other uses. Independent professional advice should be sought before using this in commercial decisions. Further information: soil and land attributes. Subsoil Carbonate dataset can be viewed at NatureMaps (>Soils>Soil Chemistry Attributes). Spatial data downloads are available from Data SA.

Data Quality

LineageThe dataset is based on an interpretation of 1:40,000 stereo colour aerial photography and limited field inspection of landscapes and soils by soil scientists. Soil Landscape Map Unit boundaries were determined after an integration of field observations and recordings; laboratory analyses; stereoscopic examination of aerial photographs; understanding of regional landscape processes and stratigraphy; existing soil and geological mapping data. To avoid inconsistencies and confusion, any updates to the Soil and Land Attribute mapping are to be managed by DEWNR Soil and Land Program. This data has been released under a Creative Commons licence. Where products are derived from this data, DEWNR are to be acknowledged, and any changes to the original data should be indicated.
CompletenessComplete. The spatial data is subject to amendment as and when more data become available.
Positional AccuracyThe accuracy is to the scale of mapping (50 metres at 1:50,000 and 300 metres at 1:100,000 mapping scale). The spatial data is to be used at the regional, subregional and catchment level, and can be used to provide property overviews; however, cannot be used at the paddock level. South East, Kangaroo Island, Mount Lofty Ranges and the 'bottom' of Yorke Peninsula have been mapped at 1:50,000. Eyre Peninsula, the main part of Yorke Peninsula, Murray Mallee and Northern Agricultural Districts have been mapped at 1:100,000. Map unit boundaries should be treated as transition zones.

Geographic Extent

Extent NameAgricultural Region - South Australia
Min Easting or Longitude132.25
Min Northing or Latitude-38
Max Easting or Longitude141
Max Northing or Latitude-32.25

Dataset Status

Initially Acquired01-JAN-2000
Last Updated01-JUL-2009
Update FrequencyAs required
Maintenance MethodAs required
AusGOALCC BY (Attribution)

Attributes

TableNameField AliasData TypeDescription
Landscape.SALAD_Carbonate_SubsoilLANSLU textSoil Landscape Map Unit.
Landscape.SALAD_Carbonate_SubsoilCARB_SUB textProportion of land with highly calcareous subsoils within 60 cm of surface (Legend category. See layer file for descriptions).
Landscape.SALAD_Carbonate_SubsoilKB1 DoublePercentage of map unit where depth to highly calcareous material (strong reaction to 1 M HCl) is more than 60 cm.
Landscape.SALAD_Carbonate_SubsoilKB2 DoublePercentage of map unit where depth to highly calcareous material (strong reaction to 1 M HCl) is 30 - 60 cm.
Landscape.SALAD_Carbonate_SubsoilKB3 DoublePercentage of map unit where depth to highly calcareous material (strong reaction to 1 M HCl) is less than 30 cm.
Landscape.SALAD_Carbonate_SubsoilKBX DoublePercentage of map unit which is not applicable.

Contact Information

OrganisationDepartment for Environment and Water
Science Monitoring and Knowledge
Postal AddressGPO Box 1047

ADELAIDE
5001
EmailDEWNR.CustomerServiceCentre@sa.gov.au