Magnetic susceptibility for use in delineating hydric soils

Soil Science Society of America Journal
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Field indicators are used to identify hydric soil boundaries and to delineate wetlands. The most common field indicators may not be seen in some soils with thick, dark, mollic epipedons, and do not form in Fe-poor soils. This study evaluated magnetic susceptibility (MS) meter as a field tool to determine hydric soil boundaries. Five Mollisoldominated sites formed in glacial deposits in Illinois were evaluated along with one Ultisol-dominated site formed in Coastal Plain sediments of North Carolina. Measurements of volumetric MS were made along transects at each site that extended from wetland into upland areas. One created wetland was evaluated. Field indicators were used to identify the hydric soils. Results showed that volumetric MS values were significantly (P < 0.01) lower in hydric soils than in nonhydric soils formed in glacial deposits. Volumetric MS values also decreased slightly with depth. In a created marsh, significant differences in MS were found between hydric and nonhydric soils at 15 to 30 cm but not at shallower depths where topsoil from a wetland had been artificially applied. No significant (P > 0.15) differences in MS were found for Coastal Plain hydric and nonhydric soils where MS values were low (<10 ?? 10-5 SI). Critical MS values that separated hydric and nonhydric soils varied between 20 ?? 10-5 and 30 ?? 10-5 SI for the loessal soils evaluated in Illinois. Such critical values will have to be determined on site using field indicators until specific values can be defined for hydric soils within a given parent material. With a critical MS value in hand, a wetland delineator can make MS measurements along transects perpendicular to the envisioned hydric soil boundary to quickly and quantitatively identify it.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Magnetic susceptibility for use in delineating hydric soils
Series title Soil Science Society of America Journal
Volume 64
Issue 6
Year Published 2000
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Soil Science Society of America Journal
First page 2174
Last page 2180
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