TY - JOUR
T1 - Classification of tephra-derived Spodosols
AU - Shoji, S.
AU - Ito, T.
PY - 1990/11
Y1 - 1990/11
N2 - There are many tephra-derived soils showing characteristic morphology and chemistry of Spodosols in humid cold climates. We reviewed ICOMOD (International Committee on the Classification of Spodosols) Proposal D by the National Soil Quality Survey Assurrance Staff (1989) using 43 tephra-derived soils from Alaska, the State of Washington, U.S.A., and Tohoku, Japan, and we propose classification of tephra-derived Spodosols including the important items as follows: 1) to recognize tephra-derived Spodosols showing characteristic morphology of Spodosols, 2) to key out Spodosols after Andisols, 3) to emphasize morphology over chemical spodic criteria, 4) to modify albic color requirement for tephra-derived Spodosols, 5) to propose a new chemical spodic criterion (oxalate A1 and a half Fe), and 6) to propose a procedure to differentiate a spodic horizon from a buried A horizon. According to our proposal, 25 of 41 pedons of tephra-derived soils which are currently classified as Spodosols will be reclassified as Spodosols, and all of them can be exactly predicted to be Spodosols by field observation.
AB - There are many tephra-derived soils showing characteristic morphology and chemistry of Spodosols in humid cold climates. We reviewed ICOMOD (International Committee on the Classification of Spodosols) Proposal D by the National Soil Quality Survey Assurrance Staff (1989) using 43 tephra-derived soils from Alaska, the State of Washington, U.S.A., and Tohoku, Japan, and we propose classification of tephra-derived Spodosols including the important items as follows: 1) to recognize tephra-derived Spodosols showing characteristic morphology of Spodosols, 2) to key out Spodosols after Andisols, 3) to emphasize morphology over chemical spodic criteria, 4) to modify albic color requirement for tephra-derived Spodosols, 5) to propose a new chemical spodic criterion (oxalate A1 and a half Fe), and 6) to propose a procedure to differentiate a spodic horizon from a buried A horizon. According to our proposal, 25 of 41 pedons of tephra-derived soils which are currently classified as Spodosols will be reclassified as Spodosols, and all of them can be exactly predicted to be Spodosols by field observation.
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U2 - 10.1097/00010694-199011000-00006
DO - 10.1097/00010694-199011000-00006
M3 - Article
AN - SCOPUS:0025621695
VL - 150
SP - 799
EP - 815
JO - Soil Science
JF - Soil Science
SN - 0038-075X
IS - 5
ER -