Parent material influence on soil distribution and genesis in a Paleudult and Kandiudult complex,southeastern USA |
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| Institution: | 1. Department of Agronomy and Soils, Auburn University, 202 Funchess Hall, Auburn, AL 36849, USA;2. Department of Crop and Soils, University of Georgia, 3111 Miller Plant Science Building, Athens, GA 30602, USA;3. USDA-SE Watershed Laboratory, P.O. Box 946, Tifton, GA 31794, USA;4. Department of Geography, University of Georgia, Athens, GA 30602, USA;1. Department of Earth Sciences, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon;2. Department of Earth Sciences, University of Douala, P.O. Box 24157, Douala, Cameroon;3. Department of Life and Earth Sciences, Higher Teachers'' Training College, University of Maroua, P.O. Box 55, Maroua, Cameroon;4. Institute of Geological and Mining Research, P.O. Box 4110, Yaoundé, Cameroon;1. ULiège, GIGA In Silico Medicine, Bât. B34 +5, Avenue de l’Hôpital 1, 4000 Liège, Belgium;2. University of Canterbury, Department of Mechanical Engineering, Centre for Bioengineering, Private Bag 4800, Christchurch, New Zealand;3. ULiège, GIGA In Silico Medicine, Bât. B5A Thermomécanique des phénomènes irréversibles, Quartier Agora, Allée du six Aôut 19, 4000 Liège, Belgium;1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China;2. Center for Cancer Prevention and Treatment, School of Public Health, Lanzhou University, Lanzhou 730000, Gansu, China;3. Medical College, Northwest University for Nationalities, Lanzhou 730030, Gansu, China;4. College of Basic Medicine, Lanzhou University, Lanzhou 730000, Gansu, China;5. Cancer Institute and Hospital, Chinese Academy of Medical Sciences, Beijing 100021, China;6. School of Public Health, Yale University, New Haven, CT 06520, United States;7. Jinchuan Worker''s Hospital, Jinchuan Nonferrous Metals Corporation, Jinchang 737103, Gansu, China;1. Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China |
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| Abstract: | Parent materials greatly influence soil development and the distribution of soils on the southeastern US Coastal Plain. We examined the physical, chemical, and mineralogical properties of 11 pedons in a 1-ha plot on the Upper Coastal Plain of Georgia, USA. Uniformity of parent materials was assessed by sand grain size characteristics. The soils have sandy epipedons of variable thickness and argillic horizons of variable texture. Six of the pedons also have kandic horizons. They are classified (US Soil Taxonomy) in Psammentic, Grossarenic, Arenic, and Typic subgroups of Paleudults and Kandiudults. Loamy pedons possess argillic horizons with two distinct increases in clay and greater differences between eluvial and illuvial horizons than sandy pedons. The upper boundary of the argillic horizon is approximately parallel to the present geomorphic surface, suggesting that it is associated with the contemporary surface. Discontinuities, identified by changes in sand grain size ratios and plots of the third (skewness) and fourth (kurtosis) moments of sand grain distribution, roughly correspond to the bottom of the solum. Our data suggest that there are both eolian and fluvial components in the solum, whereas subjacent horizons are completely derived from fluvial deposits. Sandier pedons have greater gibbsite/kaolinite ratios, possibly because greater permeability has enhanced leaching and Si loss. Our data suggest parent materials largely control soil distribution over this plot. |
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