Soils Geography

  1. Soil Classification Systems
    1. Principles of Soil Classification
      1. Taxonomic Hierarchy
        1. Diagnostic Criteria
          1. Nomenclature Systems
            1. Geographic Applications
            2. USDA Soil Taxonomy
              1. Hierarchical Structure
                1. Order Level
                  1. Suborder Level
                    1. Great Group Level
                      1. Subgroup Level
                        1. Family Level
                          1. Series Level
                          2. Diagnostic Horizons
                            1. Epipedons
                              1. Mollic Epipedon
                                1. Umbric Epipedon
                                  1. Ochric Epipedon
                                    1. Melanic Epipedon
                                      1. Plaggen Epipedon
                                      2. Subsurface Horizons
                                        1. Argillic Horizon
                                          1. Natric Horizon
                                            1. Spodic Horizon
                                              1. Oxic Horizon
                                                1. Cambic Horizon
                                                  1. Calcic Horizon
                                                    1. Gypsic Horizon
                                                      1. Salic Horizon
                                                    2. Soil Moisture Regimes
                                                      1. Aquic Conditions
                                                        1. Udic Regime
                                                          1. Ustic Regime
                                                            1. Aridic Regime
                                                              1. Xeric Regime
                                                              2. Soil Temperature Regimes
                                                                1. Cryic Regime
                                                                  1. Frigid Regime
                                                                    1. Mesic Regime
                                                                      1. Thermic Regime
                                                                        1. Hyperthermic Regime
                                                                      2. World Reference Base for Soil Resources
                                                                        1. Reference Soil Groups
                                                                          1. Principal Qualifiers
                                                                            1. Supplementary Qualifiers
                                                                              1. Diagnostic Horizons and Properties

                                                                            Previous

                                                                            7. Soil Morphology and Profile Description

                                                                            Go to top

                                                                            Next

                                                                            9. Major Soil Orders and Global Distribution