A Study of the Genesis of a Podzol—Gray-Brown Podzolic Intergrade Soil Profile in Michigan1
- D. B. Cann and
- E. P. Whiteside2
A modification of the resistant mineral method used by Marshall and Haseman was applied to a study of the genesis of a Podzol—Gray-Brown Podzolic Intergrade soil profile in Michigan. Changes in the method were (1) the use of quartz, instead of zircon, as the reference mineral, (2) the determination of quartz with a Geiger counter X-ray spectrometer, and (3) the use of the coarser fractions of the soil.
Results show that: (1) There is a total loss in weight of the solum, but a 20% gain in volume, which takes place largely in the A1, A2P and BP horizons; (2) About 85% of the soluble material originally present has been removed from the profile; (3) Orthoclase feldspars showed a slight gain in the profile, about equal to the net loss in weight. This indicates that they are very resistant to weathering. Plagioclase feldspars had decreased considerably in A2P and BP horizons but very little in B2GB horizons. (4) Marked increases in organic matter in the BP horizons and in organic matter and clay in the B2GB horizons seem to indicate that both of these are illuvial horizons. However, the principal constituent concentrated is organic matter in the Podzol B and silicate clay in the Gray-Brown Podzolic B. It seems certain that the two illuvial processes are now occurring simultaneously in this soil.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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