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Дата изменения: Wed Jun 16 00:03:56 1999 Дата индексирования: Tue Oct 2 15:24:19 2012 Кодировка: |
paleosol=nonsense?
Posted by Howard Hobbs 16 Jun 1999 00:03:56 It's difficult to reply to such a bald statement. I'm tempted to ask:"What part of paleosol don't you understand?" There is a distinction between buried soil and paleosol, even though the two overlap considerably. The "paleo" (old) element is a necessary part of the paleosol concept, but not of the buried soil. For example, since it became known that I was interested in paleosols, I have had numerous people wanting to drag me out and show me the buried soil they have discovered. Invariably, these turned out to be just thatп buried soils. In other words, modern soils buried by construction debris, quarry and gravel pit spoil, etc. Another way to look at the question is to determine if the buried soil is in or out of equilibrium with the current environment. Being buried automatically puts it out of equilibrium, of course, but a related question would be: can you learn anything about the past environment from this soil that you can't get from adjacent unburied soil profiles? The answer is no for modern soils buried by spoil, but a qualified yes for these buried alluvial soils. In the agricultural landscape, most soils that are not buried are partly eroded; and the soil-forming environment is different from the pre-settlement one, even though the climate is similar. I will restrict this comment to the distinction between buried soils and buried paleosols. Others can explore the differences between unburied soils and unburied paleosols (exhumed or relict). *Lively, R.S., Bettis, E.A.lll, Hallberg, G.R., Hobbs, H.C., 1987, An exposure of the Sangamon soil in southeastern Minnesota; Proceedings Iowa Academy of Science 94 (4): p.111-115. Poch, G.A., Carlson, C., Cummins, J., Harms, G., Aldeen, D., McCormick, J., Hundley, S., Saari, C., and Lueth, R., 1980, Soil survey of Olmsted County, Minnesota; United States Department of Agriculture, Soil Conservation Service, and Minnesota Agricultural Experiment Station.
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