Land resources of the Victoria River District
Napier, Diane E; Hill, Jason V; Northern Territory. Department of Land Resource Management. Land Resource Assessment Branch
E-Publications; E-Books; PublicationNT; Technical Report Number 19/2012
This Technical Report describes a land resource survey. It was mapped at a survey scale of 1:100 000 and includes a description of the landforms, soils and vegetation for 237 land units. The surveyed area of 74 502km2 is located 700km south west of Darwin and covers 23 major land holdings in the Victoria River District, (VRD) Northern Territory. The objectives of the project were to map, describe and evaluate the pastoral lands of the VRD and provide this information to land managers, industry, government and other relevant stakeholders.
Made available via the Publications (Legal Deposit) Act 2004 (NT)
1. Introduction; 2. Previous Mapping; 3. Survey Collection Methodology and Data Collection; 4. Lithology and Stratigraphy; 5. Landform; 6. Soil Classification; 7. Vegetation; 8. Land Evaluation; 9. Soil Erosion; 10. Land Unit Descriptions; References; Appendices x 10. Tables x 49. Figures x 10.
Soils -- Northern Territory -- Victoria River; Land use -- Northern Territory -- Victoria River; Geology -- Northern Territory -- Victoria River
Northern Territory Government
Technical Report Number 19/2012
vii, 363 pages : colour illustrations and maps ; 30 cm.
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
76 of the Victoria River DistrictLAND RESOURCES 76 This class also include soil landscapes with 1 - 3 % slopes known to have fragile properties such as dispersive soils or high levels of fine sand or silt. Examples include the gently undulating siltstone landscapes on Newry, the granitic sands on Birrindudu Station and a number of calcareous plains across the district, particularly in the Ord River Catchment. Very High Erosion Risk These land units are very fragile due to their soil properties or their placement in a landscape that is affected by high velocity and/or concentrated runoff. Some typical landscapes are presented in Table 9 - 1. These include fragile soil landscapes with slopes in the 3 - 5 % range and all of those with slopes above 5 %. The very high erosion risk areas are generally rugged steep terrain but also those with dispersible soils (Nelson and Gordon land systems) in the Ord River Catchment on Mistake Creek, Nelson Springs and Brumby Plains. Some basalt foot slopes and undulating plains (Uindait land system) in the upper Ord River and unconsolidated sands, sodic and sometimes impermeable back plain soils along river systems, creek banks and levees systems (Ivanhoe land system) are also included. Some of these areas have productive pastures that are favoured by stock further adding to their risk. These areas will erode from minor disturbances such as fence line construction or cattle pads and from grazing pressure by stock and feral animals. They require careful and customised management for long term productivity. A number of these locations are already significantly degraded from past management so may require a rehabilitation plan, similar to those that have taken place in parts of the upper Ord River Catchment. Table 8-7 Limitation classes for erosion risk 27 Table Error! No text of specified style in document.-46 Factors used to determine Erosion risk Slope (%) Soil-landscape Fragile soil-landscape <1 Low (L) Moderate (M) 1-3 Moderate (M) High (H) 3-5 High (H) Very High (V) >5 Very High (V) Very High (V) Table Error! No text of specified style in document.-47 Limitation classes for erosion risk Limitation Erosion risk Extent km Land units L Soils at low risk due to minimal slopes, stable soils and slow runoff 350 5 land units (7l1, 9m1, 9m2, 9m3, 9m4) M Soils at risk due to substantial slopes and rapid run off 38 291 96 land units (Mostly plains) H Soils at high risk due to substantial slopes and rapid run off 35 649 133 land units (Plateaux, Sideslopes, Hills, Low Hills, Rises, Drainage Systems and some Plains with unstable soils) V Soils at very high risk due to proximity to river systems, rapid run off and unstable soils 213 2 land units (8l3, 8l5) Table Error! No text of specified style in document.-48 VRD Land units at risk of erosion Land systems (Stewart et al. 1970), & (Aldrick et al 1978) Area (km) Prominent VRD land units across land systems prone to soil erosion or with existing erosion Gordon 1 028 5d10, 5d3, 4d, 5g1, 6d3 Nelson 923 5d10, 6d16, 5d12, 8l, 4d2, 6d14, 7l Ivanhoe 1 904 7l, 8l, 8l11, 8l1, 8l2, 7l9, 8l4 Uindait 1 159 6a, 5a2, 5a15, 5a18, 5a7, 8l, 5a1