Soils Geography

8.

Soil Classification Systems

8.1.

Principles of Soil Classification

8.1.1.

Taxonomic Hierarchy

8.1.2.

Diagnostic Criteria

8.1.3.

Nomenclature Systems

8.1.4.

Geographic Applications

8.2.

USDA Soil Taxonomy

8.2.1.

Hierarchical Structure

8.2.1.1.

8.2.1.2.

8.2.1.3.

Great Group Level

8.2.1.4.

8.2.1.5.

8.2.1.6.

8.2.2.

Diagnostic Horizons

8.2.2.1.

8.2.2.1.1.

Mollic Epipedon

8.2.2.1.2.

Umbric Epipedon

8.2.2.1.3.

Ochric Epipedon

8.2.2.1.4.

Melanic Epipedon

8.2.2.1.5.

Plaggen Epipedon

8.2.2.2.

Subsurface Horizons

8.2.2.2.1.

Argillic Horizon

8.2.2.2.2.

8.2.2.2.3.

8.2.2.2.4.

8.2.2.2.5.

8.2.2.2.6.

8.2.2.2.7.

8.2.2.2.8.

8.2.3.

Soil Moisture Regimes

8.2.3.1.

Aquic Conditions

8.2.3.2.

8.2.3.3.

8.2.3.4.

8.2.3.5.

8.2.4.

Soil Temperature Regimes

8.2.4.1.

8.2.4.2.

8.2.4.3.

8.2.4.4.

8.2.4.5.

Hyperthermic Regime

8.3.

World Reference Base for Soil Resources

8.3.1.

Reference Soil Groups

8.3.2.

Principal Qualifiers

8.3.3.

Supplementary Qualifiers

8.3.4.

Diagnostic Horizons and Properties

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7. Soil Morphology and Profile Description

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9. Major Soil Orders and Global Distribution