Soil classification tables

Description

Standard soil classification tables for the United States Department of Agriculture (USDA) and IUSS / FAO World Reference Base (WRB) classification systems, including the tables used to correlate various soil classification systems.

Usage

data(soil.classes)

Format

Contains a list of tables:

Canadian

data frame; Canadian soil classification system (Soil Classification Working Group, 1998)

FAO1990.WRB

data frame; FAO 1990 (FAO-Unesco Soil Classification System) system to WRB (2006)

USDA_GreatGroups

data frame; list of USDA Great Groups (USDA, 2010)

WRB_versions

data frame; correlation between various FAO/WRB versions (Krasilnikov et al. 2009)

FAO1974.WRB

data frame; correlation FAO 1974 system to WRB (IUSS Working Group WRB, 2006)

USDA.WRB

data frame; correlation USDA system to WRB system

Soils_World

data frame; referent soil profiles of the world (van Baren and Lof, 1987)

Note

Some of the original tables from the literature have been adjusted / updated by the author. Correlation between various national and international systems often leads to multiple soil classes being possible equivalents. These are separated in tables using "/" symbol e.g. Dark Gray Chernozem = Boralfic Boroll / Albolls. Some national soil classification systems contain classes which are completely unique and hence most likely can not be correlated to any class in the target system.

Author(s)

Tomislav Hengl

References

• van Baren, H. and Lof, P. (1987) Soils of the World, published by Elsevier in Association with ISRIC, FAO, and UNESCO ISBN 0444425756

• Krasilnikov, P., Marti, J., Arnold, R., and Shoba, S., eds. (2009) A Handbook of Soil Terminology, Correlation and Classification, Earthscan LLC, pp. 448 ISBN 9781136546631

• Soil Classification Working Group, (1998) The Canadian System of Soil Classification. 3rd Ed. Agriculture and Agri-Food Canada Publication 1646, 187 pp. ISBN 0660174049

• USDA / Soil Survey Staff, (2010) Keys to Soil Taxonomy (Eleventh Edition) U.S. Department Of Agriculture, Natural Resources Conservation Service, 346 pp. ISBN 9781782662112

• IUSS Working Group WRB (2006) World Reference Base for Soil Resources 2006: A Framework for International Classification, Correlation and Communication, Food and Agriculture Organization of the United Nations 128 pp.

Examples

data(soil.classes)
soil.classes$USDA_GreatGroups[1,]
DGC <- which(soil.classes$Canadian$CSSC_Great_Groups=="Dark Gray Chernozem")
soil.classes$Canadian[DGC,]