ASRIS Technical Specifications V1.6

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TextureTexture class and clay content (%) are estimated for the five layers. In Australia, field texture is notsynonymous with the particle size distribution. The former integrates particle size information with extraaspects relating to soil mechanical behaviour – the latter is affected by mineralogy, sodicity, organic mattercontent and cation composition. Estimates of clay content based on field texturing should therefore takethese factors into account. For example, a Red Ferrosol with 80% clay that is very strongly aggregated canhave a clay-loam texture, while another soil with a clay content of only 35%, but strong sodicity andabundant fine sand, may have a heavy-clay texture.Estimation methods for texture and clay content are recorded (Table 21 and Table 22). Field-texture followsthe definitions in NCST (2009) – the codes are shown in Table 23. Use of the modifiers and qualifiers isoptional.Table 21: Estimation method for field textureEstimationMethodDescription1 Estimate based on measurements of field texture for replicated soil profiles inthe land-unit tract2 Estimate based on a single measurement of field texture in the land-unit tract3 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 orproject area5 Estimate based on experience with similar soils (e.g. same taxa in theAustralian Soil Classification but from other regions).Table 22: Estimation method for clay contentEstimationMethodDescription1 Estimate based on replicated laboratory measurements of particle size fromrepresentative soil profiles in the land-unit tract2 Estimate based on laboratory measurement of particle size from arepresentative soil profile in the land-unit tract3 Estimate based on particle size analysis on similar soils in the same land unittype (e.g. modal profiles)4 Estimate is based on field textures from representative soil profiles in theland-unit tract5 Estimate based on particle size analysis of similar soils in the region or projectarea6 Estimate is based on field textures from soil profiles in the land-unit tract7 Estimate is based on field textures from similar soils in the project area8 Estimate based on experience with similar soils (e.g. same taxa in theAustralian Soil Classification but from other regions).36
Layer-1 Texture and clay contentThe control section and convention for recording Layer-1 Texture and Layer-1 Clay content are as follows.• If there is a single A1 horizon without subdivisions (e.g. A11, A12), then Layer-1 Texture and Layer-1Clay content are the texture and clay content of the A1 horizon.• If there are subdivisions within the A1 horizon, the Layer-1 Texture and Layer-1 Clay content are takenfrom the thickest A1 horizon layer within the top 0.20 m of the soil profile (the upper layer is used ifthicknesses are equal).• If the surface layer is an O horizon, the texture of the underlying A1 horizon is used in accord with theabove criteria.• If the surface layer is an O horizon and there is no underlying A1 horizon, the Layer-1 Texture and Layer-1 Clay content are taken from the thickest layer in the 0.20 m directly beneath the O horizon.• If the surface layer is a peat, Layer-1 Texture and Layer-1 Clay content are recorded using the 7 classesof organic materials defined by NCST (2009) and shown in Table 23.Layer-2 Texture and clay content• The Layer-2 Texture and Layer-2 Clay content usually refer to the average texture and clay content ofthe lower portion of the A horizon. The A horizon at this depth may be an A1, A2, A3, AB, A/B orsubdivision thereof. Layer 2, if present, is always below Layer 1.• If the surface layer is not an A1 horizon (e.g. O horizon) and there is no underlying A horizon, theattribute is recorded as missing (NA for texture, –9999 for clay content –see page 66)• If the A horizon is thin and the profile only has a few layers, Layer-2 Texture and Layer-2 Clay contentmay be recorded as missing.• If the A horizon is thin and multiple contrasting layers occur deeper in the profile, Layer-2 Texture andLayer-2 Clay content can refer to layers below the A (e.g. B1, 2A, 2B, 2D).Layer-3 Texture and clay contentThe B-horizon definition below follows the Field Handbook with the modification suggested by Isbell (2002)(the criteria in part being “…an illuvial concentration of silicate clay, iron, aluminium, humus, carbonates,gypsum, or silica, alone or in combination”). The Layer-3 Texture and Layer-3 Clay content are defined inmost cases as follows.• If a B horizon is present, the Layer-3 Texture and Layer-3 Clay content are the texture encounteredin the upper B (usually B1 and B21).• If no B horizon is present and the sequence consists of an AC profile, the Layer-3 Texture and Layer-3Clay content generally refers to the materials directly below the A horizon (usually the upper 0.20m).• In more complex profiles, Layer-3 Texture and Layer-3 Clay content refer to the third functional layerin the profile.37
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: (a) (b) (c)A11A11A1 1A21A222B23B22B
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 and 62: Table 32: Permeability classesClass
Page 63 and 64: Table 34: Estimation method for ele
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

ASRIS Technical Specifications V1.6

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