Territory Stories

Land Resources of Auvergne Station

Details:

Title

Land Resources of Auvergne Station

Other title

A supplement to the Land Resources of the Victoria River District

Creator

Napier, Diane; Edmeades, Bart; Lynch, Brian; McGregor, Robert; Northern Territory. Department of Environment and Natural Resources

Editor

Hill, J.V.

Collection

E-Publications; E-Books; PublicationNT; Jul-18

Date

2018-06-30

Location

Auvergne Station; NT Portion 2676; Victoria River Downs; Victoria River District

Description

This report for Auvergne Station is a supplement to Land Resources of the Victoria River District (2012) and completes the land resource assessment of the district which covers 24 properties and approximately 78 760 km² of pastoral land. Land unit mapping at 1:100 000 describes the landforms, soils and vegetation in the district.

Notes

Made available via the Publications (Legal Deposit) Act 2004 (NT)

Table of contents

Table of contents; 1. Introduction; 2. Previous mapping; 3. Survey methodology and data collection; 4. Lithology; 5. Landform; 6. Soil; 7. Soil physical and chemical characteristics; 8. Vegetation; 9. Land evaluation; 10. Soil erosion; 11. Land unit descriptions; 12. References; Appendices 1 - 12.

Language

English

Subject

Soils -- Northern Territory -- Auvergne Station; Land use -- Northern Territory -- Auvergne Station; Geology -- Northern Territory -- Auvergne Station; land resource assessment; land units; soil landscapes; vegetation communities

Publisher name

Northern Territory Government

Place of publication

Palmerston

Series

Jul-18

Format

204 pages ; colour photographs, maps, figures, tables ; 30 cm.

File type

application/pdf

ISBN

9781743501498

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Related links

http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=E3F20A909A8123ADE040CD9B21446CC0; http://hdl.handle.net/10070/245323 [Land resources of the Victoria River District]

Parent handle

https://hdl.handle.net/10070/300258

Citation address

https://hdl.handle.net/10070/378762

Page content

Land Resources of Auvergne Station A supplement to the Land Resources of the Victoria River District 181 4. Estimation of profile permeability required conversion of the standard 4 class modal field permeability values defined by NCST (2009), to a 6 class profile permeability (PP) framework defined by Rosewell and Loch (2002). Conversion from the 4 class system to the 6 class system considered field permeability and dispersed PSA data from the least permeable soil horizon in its determination. Final input values were adjusted or moderated using the decision rules listed in Table 1 (Rob Ellis, personal communication, DSITI, Queensland). Table 1 Decision rules to convert modal field permeability value (NCST 2009) to the 6 class profile permeability (PP) categories defined by Rosewell and Loch (2002) Field permeability class (NCST 2009) RUSLE Profile permeability (Rosewell and Loch 2002) Class Rating mm/day Field perm Class 3 rule Class Rating mm/day - - - - PP Class 1 Rapid >3120 Class 4 High >500 - PP Class 2 Moderate to rapid 1440-3120 Class 3 Moderate 50-500 coarse sand > fine sand PP Class 3 Moderate 480-1440 coarse sand < fine sand PP Class 4 Slow to Moderate 120-480 Class 2 Slow 5-50 - PP Class 5 Slow 1-5 Class 1 Very slow <5 - PP Class 6 Very Slow <1 5. For soils such as Kandosols, with a field permeability value of 3 (NCST 2009), final profile permeability class has been split between PP Class 3 and PP Class 4 depending on dominant sand fraction within the upper profile (to at least 1.0 m). Profiles dominated by coarse sand have been assigned to PP Class 3, while profiles dominated by fine sand have been assigned to PP Class 4. Soils with a coarse sand fraction are considered more permeable, and have been separated on this basis. 6. A profile permeability (PP) value of 6 has been assigned in situations where shallow soils directly overlie an impervious substrate (Rosewell and Loch 2002). Shallow soils are defined as soils with substrate present at or before 0.25 m, and correspond with the very shallow category of Isbell and NCST (2016). 7. Adjustment of final profile permeability (PP) class for gravelly soils follows the recommendations of Rosewell and Loch (2002). Gravel has been assessed on a whole of profile basis (excluding C horizons), and considers the maximum content recorded within each analysed site. Values were also correlated with modal land unit estimates (prior to final permeability adjustment) to ensure estimates were representative. Table 2 Soil erodibility classes for soil based on K factor (Rosewell and Loch 2002) Soil erodibility class K factor Very low <0.010 Low 0.010 0.020 Moderate 0.020 0.040 High 0.040 0.060 Very high >0.060 Modified K factor (Km) calculation Modified K factor values of Loch and Rosewell (1992) are calculated as: Km = K nomograph (di 1) / (ds 1) When the density of water is subtracted from both sediment density terms, this is reduced to: Km = K nomograph / (ds 1) where the wet sediment density (ds) of the aggregated clay soil being assessed is estimated from the measured sand percentage >0.02 mm (X%) and calculated as: ds = 1.462 + 0.048 (1.03259X).


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