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<br />Management Situation by Revision Topi( <br /> <br />Table 11I-2 summarizes the criteria used to differentiate each ecological unit in the national hierarchy <br />(ECOMAP, 1993). <br /> <br />.~.1 <br /> <br />Table 11I-2. Principal Map Unit Design Criteria of Ecological Uni1s <br /> <br />Ecological Unit Principal Map Unit Design Criteria' <br />Domain . Broad climatic zones or groups (e.g., dry, humid, tropical). <br />Division . Regional climatic types (Koppen 1931, Trewartha 1968) <br /> . Vegetational affinities (e.g., prairie or forest). <br /> . Soil order. <br />Province . Dominant potential natural vegetation (Kuchler 1964) <br /> . Highland or mountains with complex vertical climate-vegetation-soil <br /> zonation. <br />Section . Geomorphic province, geologic age, stratigraphy, lithology. <br /> . Regional climatic data. <br /> . Phases of soil qrders, suborders or great groups. <br /> . Potential natural vegetation. <br /> . Potential natural communities (PNC) (FSH 2090). <br />Subsection . Geomorphic process, surficial geology, lithology. <br /> . Phases of soil orders, suborders, or great groups. <br /> . Subregional climatic data. <br /> . PNC -- formation or series. <br />Landtype Association . Geomorphic process, geologic formation, surficial geology, and <br /> elevation. <br /> . Phases of soil subgroups, families, or series. <br /> . Local climate. <br /> . PNC -- series, subseries, plant associations. <br />Landtype . Landform and topography (elevation, aspect, slope gradient, and <br /> position). <br /> . Rock type, geomorphic process. <br /> . Phases of soil subgroups, families, or series. <br /> . PNC -- plant associations. <br />Landtype Phase . Phases of soil families or series. <br /> . Landform and slope position. <br /> . PNC -- plant associations or phases. <br /> <br />1 It should be noted that the criteria listed are broad categories of environmental and <br />landscape components. The actual classes of components chosen for designing map units depend on <br />the objectives for the map. <br /> <br />111-3 <br /> <br />" ".. .., <br />\J ~I ,li... \J <br />