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 28 Acid Sulfate Soils Acid sulfate soils are found along coastlines and are associated with intertidal and estuarine areas (Hill and Edmeades 2008). These soils are harmless when undisturbed because the saturated water prevents the oxygen reacting with the iron sulfides. However once these soils are disturbed or drained, the iron sulfides are exposed to air and produce sulfuric acid. The impacts from acid sulfate soils can be catastrophic. High levels of acid are toxic to plants, fish and aquatic and wetland ecosystems, lead to contamination of groundwater with arsenic, aluminium and heavy metals, corrosion to infrastructure and a reduction to productivity due to soil degradation and extreme soil acidity often below pH 2. (QLD Government 2013, DER WA 2015) The best way of managing acid sulfate soils is to avoid disturbance. Knowledge of their location is crucial when development or management is proposed in any area that may contain them. On Auvergne, acid sulfate soils exist along tidal creeks within the marine plains and salt flats associated with the Victoria River. Two sites were sampled and one confirmed the presence of acid sulfate soils. The Victoria River is tidal for approximately 160 km from its mouth in the Joseph Bonaparte Gulf (Sanders and Rajaratnam 1994) with the tidal extent ending at a series of rapids 20 km upstream of Timber Creek (Kirby and Faulks 2004). It is also likely that acid sulfate soils will be present along the rivers course and also at the mouths of the major tributaries such the West Baines and East Baines Rivers. Mangrove species can generally be used as key indicators of acid sulfate potential and although mangrove communities are not concentrated in this area Avicennia marina is common along tidal creeks. Acid sulfate soil results are presented in section 9 table 9.8 and in greater detail in Appendix 3. Saline Soils Salinity is the presence of salt on the land surface, in soil or rocks, or dissolved in water in our rivers or ground water (DLWC NSW 2000a). Although it can occur naturally, salinity can be accelerated by human intervention that has disturbed natural ecosystems and changed the hydrology of the landscape. It is a long term problem that is difficult and in some cases impossible to reverse and it threatens agricultural and pastoral production as well as the diversity and health of natural ecosystems. Methodology Soil salinity levels were measured by conducting the electrical conductivity test on 1 part soil with 5 parts of distilled or deionised water (EC1:5) and converted to ECe (conversion methods below). Saline soils are defined as those having an ECe value >4 dS/m. Interpretative categories defined by Hazelton and Murphy (2016) are presented in Table 7.4.


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