endstream endobj 105 0 obj<>/Metadata 5 0 R/PieceInfo<>>>/Pages 4 0 R/PageLayout/OneColumn/StructTreeRoot 7 0 R/Type/Catalog/LastModified(D:20070926181800)/PageLabels 2 0 R>> endobj 106 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>>/Type/Page>> endobj 107 0 obj<> endobj 108 0 obj<> endobj 109 0 obj[/ICCBased 119 0 R] endobj 110 0 obj<>stream hummock – a small mound that is usually composed of peat moss or clumps of graminoids . 104 0 obj <> endobj 3.3.2. H‰”U[o›0~çWœG�Ç6æ&U•Ú4[3­)l/í(q6 0000003506 00000 n Among the factors that enter into the classification of tropical lowland peats are the organic content and degree or level of humification (on the von Post scale). It is based on categorisation of botanical composition, degree of humification, water content, content of fine and coarse fibres and content of woody remnants. 4.1 The purpose of this classification is to standardize the naming of peat materials so that the peat-producer can better identify the product and the peat-consumer can better select peat materials to meet requirements. The Hemic peat is the groups H 5 to H 7 and consists of 33 to 66% fibers. The von Post humification test (von Post classification system) involves squeezing the peat and the material that is extruded between the fingers, examining the material, and classifying the soil as belonging to one of ten (H1–H10) humification or decomposition categories. hydric Plant remains easily identifiable. Some of the peat classification systems rely on biologic descriptions of plant constituents. Canadian System of Soil Classification, 3rd edition ; OR; Fibrisol (F) Soils of this great group are composed largely of relatively undecomposed fibric organic material. Alberta Wetland Classification System . Peat soil and binders (70:30) were inserted into a PVC pipe with the diameter of 50 mm and length of 200 mm. MANUAL CLASSIFICATION SYSTEMS The best known classification system for peats is that of von Post (von POST and GRANLUND [66]). xÚb``b``é` ı^TÀÄ, lH‚BPÌÀ ÂÀ#8±AÖ€Á¤ÙÁF8ÏFi›ò#O}./Ş€ó¼4!ª™¬: 4ƒ320˜ˆBh¶b¸™@ó}R!¢Œ– �o " Table 1 shows 10 degrees of humification (H1 to H10) in the von Post classification [2]. Moisture content The many peat classification schemes often rely on overly descriptive means to categorize these soils for engineering purposes. This elegantly simple test clearly describes the continuum found in the research areas, from a sponge-like catotelm with nearly unlimited hydraulic conductivity to impermeable black peat. LANDVA and ROCHELLE [36] speak of a Radforth peat when the mineral content is very low. This scale is based on factors such as botanical composition, degree of humification, and the color of peat water after squeezing. be estimated visually from freshly extracted peat, using either a 10-point (von Post & Granlund 1926) or a 5-point (Troels-Smith 1955) scale. Abstract. This gives a reasonable assessment for rapid description of peat stratigraphy. <<9EDCC0833EBCBA4DAAFF344CB98627CD>]>> Peat classification methods for engineering purposes and the main factors and aspects of these classification systems are discussed. This system may also be used for peat resource evaluations, environmental impact reports, and preliminary engineering studies. None Insignificant Very siight Slight Mod&rate Modcratcly strong Strong Very strong Nearly cornpEe te Complete Easily i&n! Using parameters such as fibre integrity, colour and viscosity of exudate, and presence of colloidal particles, it creates a descriptive framework across a wide range of organic soils, and assigns a numerical value from 1 (undecomposed) to 10 (colloidal). The degree of decomposition is commonly assessed using the 10 classes of humification of the von Post scale (von Post, 1922) where H1 refers to the least, H10 the most decomposed peat. Some of the peat classification systems rely on biologic descriptions of plant constituents. The generic RSPO definition of peat soil is as follows: “Histosols (organic soils) are soils with cumulative organic layer (s) comprising more than half of the upper 80cm or 100cm of the soil surface containing 35% or more of organic matter (35% or more Loss on Ignition) or 18% or more organic carbon” Root fibres, wood residues and degree of moisture are also indicated. Peat can be defined as the accumulation of 100% pure organic material which contains at least 65% organic matter or less than 35% mineral content. In the research areas, desirable plants (forage grasses) grew most strongly in areas with von Post scores between 7 and 9. CHARACTERISING PEAT 2.1. Agricultural Research and Practice in the Outer Hebrides. EPA Export 25-07-2013:16:15:27. 0000000736 00000 n However, the FAO now uses the USDA Soil Taxonomy system which condensed the 10 von Post levels into three (fibrists, mesists, and saprists), while simultaneously noting the need for greater precision at management level. The Von Post scale (Table 16) recognizes 10 steps; little decomposed fibrous, light-coloured peat being defined as H1, whereas the well decomposed, colloidal, dark-coloured material at the other end of the scale is indicated as H10. It may also indicate topographical or hydrological conditions that support or impair land restoration. a Von Post of greater than 6); most of these materials are humified and have few recognizable fibers . 0000004374 00000 n H4 Slightly decomposed peat which, when squeezed, releases very muddy dark water. ROADEX classification of peat based on Von Post, (after Karlsson & Hansbo 1981) This table recognises that the plants at the bottom of a peat bog could be the same as those at the top, the only difference being their different stages of decay. The existing von Post and Radforth systems are examined with respect to geotechnical applications. The three decomposition stages are assigned Of, Om, or Oh designations depending on the degree of decomposition of the organic material. For peat classification geo-botanical properties are broadly used and applied in classification methods. Areas, desirable plants ( forage grasses ) grew most strongly in with... 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