ASRIS Technical Specifications V1.6

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Electrical conductivityThe electrical conductivity (EC) is estimated for the five layers. The estimation method is recordedaccording to Table 34.The electrical conductivity refers to a 1:5 soil:water extract and the units are dS/m.Layer-1 EC• If there is a single A1 horizon without subdivisions (e.g. A11, A12), then estimate the Layer-1 EC usingthe A1 horizon.• If there are subdivisions within the A1 horizon, the Layer-1 EC is generally taken from the thickest A1horizon layer within the top 0.20 m of the soil profile (the upper layer is used if thicknesses are equal).• If the surface layer is an O horizon, the underlying A horizon is used in accord with the above criteria.• If the surface layer is an O horizon and there is no underlying A horizon, the Layer-1 EC is taken fromthe 0.20 m directly below below the O horizon.• If the surface layer is a peat, the estimate applies to the upper 0.20 m of the surface horizon.Layer-2 EC• The Layer-2 EC is generally the average electrical conductivity of the lower 100 mm of the A horizon.The A horizon at this depth may be an A1, A2, A3, AB, A/B or subdivision thereof.• If the surface layer is not an A horizon (e.g. O horizon) and there is no underlying A horizon, theattribute is recorded as missing.• If the A horizon is thin and the profile only has a few layers, Layer-2 EC may be recorded as missing.• If the A horizon is thin and multiple contrasting layers occur deeper in the profile, Layer-2 EC can referto layers below the A (e.g. B1, 2A, 2B, 2D).Layer-3 EC• In soils with a B2 horizon, the estimate is for the upper 0.20 m of the B2 horizon (or for the major partof the B2 horizon if it is less than 0.20 m thick).• In more complex profiles, Layer-3 EC refers to the third functional layer in the profile.Layer-4 ECIn most profiles, Layer-4 EC refers to the lower part of the B horizon – this is usually a B22 or B3 and it oftenstarts at around 0.80 m. If the profile and B horizon are thin (
Table 34: Estimation method for electrical conductivityMethodDescription1 Estimate based on measurements of electrical conductivity for replicated soilprofiles in the land-unit tract2 Estimate based on a single measurement of electrical conductivity in the landunittract3 Estimate based on direct measurements of similar soils in the same land unittype (e.g. modal profiles)4 Estimate based on direct measurements of similar soils in the region or projectarea5 Estimate based on experience with similar soils (e.g. same taxa in theAustralian Soil Classification but from other regions)Aggregate stabilityAggregate stability is estimated using a three-class system based on Emerson (2002) (Table 35) using thesame control sections as for electrical conductivity. The method code is also recorded (Table 36).Table 35: Aggregate stability classes based on Emerson (2002)Code Class DescriptionS Stable Aggregates are stable in distilled water (e.g.Emerson Classes 5–7)M Moderately stable Dispersion occurs after re-moulding when wet(e.g. Emerson Classes 3a and 3b )U Unstable Aggregates disperse spontaneously in distilledwater (e.g. Emerson Classes 1–2)Table 36: Estimation method for aggregate stabilityEstimationMethodDescription1 Estimate based on measurements of aggregate stability for replicated soilprofiles in the land-unit tract2 Estimate based on a single measurement of aggregate stability in the land-unittract3 As for 2 but rapid measurement, often in the field (e.g. 1-hour dispersion)4 Estimate based on direct measurements of similar soils in the same land unittype (e.g. modal profiles)5 Estimate based on direct measurements of similar soils in the region or projectarea6 Estimate based on experience with similar soils (e.g. same taxa in the AustralianSoil Classification but from other regions)53
Page 1:
SUSTAINABLE AGRICULTURE FLAGSHIPThe
Page 6 and 7:
Table 1: Complementary benefits of
Page 8 and 9:
Table 62: The num_est_method_type t
Page 11 and 12: 1 SummaryThis document specifies th
Page 13 and 14: 2 User needs for soil and land reso
Page 15 and 16: 2.3 Mapping, monitoring, modelling,
Page 17 and 18: estimates of soil erosion by water.
Page 19 and 20: 3 Development of ASRISASRIS was ini
Page 21 and 22: Handbook (NCST 2009) will be famili
Page 23 and 24: 4.2 Upper levels of the hierarchyTh
Page 25 and 26: 5 Accuracy, precision and a basis f
Page 27 and 28: 1.0MeanProbability5 %quantile95 %qu
Page 29 and 30: 6 Level-1 descriptors (land provinc
Page 31 and 32: Figure 5: Relative reliefFigure 6:
Page 33 and 34: Figure 7: Average annual excess wat
Page 35 and 36: 10 Level-5 descriptors (land system
Page 37 and 38: 10.3 LandformRelief/modal slopeReli
Page 39 and 40: 11 Level-6 descriptors (land facets
Page 41 and 42: Table 15: Landform elements (after
Page 43 and 44: Table 17: Described gilgai componen
Page 45 and 46: (a) (b) (c)A11A11A1 1A21A222B23B22B
Page 47 and 48: Layer-1 Texture and clay contentThe
Page 49 and 50: ZL Silty loam ZLA Sapric silty loam
Page 51 and 52: Coarse fragmentsCoarse fragments ar
Page 53 and 54: pH profileThe pH in a 1:5 CaCl 2 so
Page 55 and 56: Total thickness of A horizonThe tot
Page 57 and 58: Table 31: Method for the estimation
Page 59 and 60: Profile availablewater capacityAdju
Page 61: Table 32: Permeability classesClass
Page 65 and 66: Exchangeable bases, CEC, and ESPEst
Page 67 and 68: Australian Soil ClassificationThe A
Page 69 and 70: FH Palic GZ Bleached-Orthic IS Ferr
Page 71 and 72: Table 47: Reference Soil Group code
Page 73 and 74: Local taxonomic classIf available,
Page 75 and 76: 12 Soil Profile DatabaseAs noted ea
Page 77 and 78: Figure 12: Database design for ASRI
Page 79 and 80: Table 57: The ref_sites tableColumn
Page 81 and 82: Table 61: The param_num_method tabl
Page 83 and 84: Table 68: The codes table.Column Na
Page 85 and 86: 15 ReferencesACLEP (in prep.) SITES
Page 87 and 88: McKenzie NJ, Ryan PJ (1999) Spatial
Page 89 and 90: Appendix 1: Conversion for pH in wa
Page 92: CONTACT USt 1300 363 400+61 3 9545
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ASRIS Technical Specifications V1.6

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