Donald G. Mcgahan
Assistant Professor
Department of Agriculture
Tarleton State University
United States of America
Biography
I am interested in identifying systematic variation in soil morphology and soil genesis using relationships with climate, vegetation and biological organisms, geomorphology, and geology. As a soil morphologist I utilized multiple low and high technology tools to investigate soil and soil mineralogical alterations brought about by the soil forming factors. Mineralogical alterations are the primary cause of many important values we measure in soils. By studying the alteration of minerals and considering the evolution of soils (a very slowly renewable resource), relationships vital to addressing landscape scale issues are better understood. This knowledge of soil “in the environment” and “of the environment” is applicable to site-specific soil management(s) including both land use for agricultural, and land use for non-agricultural soils and soil uses. Furthermore, I operate under the premise that understanding soil is also vital to conservation of many other natural resources.
Research Interest
Soil morphology, Soil nutrient cycling and Soil management.
Publications
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Daniel ER, McGahan D,Claassen V (2006) Ammonium Fixation in Selected California Decomposed Granites. Plant and Soil. 289:289-300.
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McGahan DG,Southard RJ,Claassen VP (2008) Tectonic Inclusions in Serpentinite Landscapes Contribute Plant Nutrient Calcium. Soil Sci. Soc. Am. J. 72:837-846.
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McGahan DG,Southard RJ, Zasosoki RJ (2014) Rhizosphere effects on soil solution composition and mineral stability. Goederma. 226-227:340-347.