Soil Geography of the USA

Prof. James Bockheim is an international renown Professor in Soil Sciences at the University of Wisconsin in Madison (USA). He is specialized in pedology, biogeochemistry, forest soils, polar and alpine soils. His research interests include soils in Antarctica, paleoenvironments in Patagonia, soil properties studies to detect fault ages in southern California etc. He has been supervising 14 PhDs and in 2009, he received the Soil Science Society of America-New Zealand Soil Science Society Award.

Since 1980, our understanding of the factors and processes governing the distribution of soils on the Earth s surface has increased dramatically, as have the techniques for studying soil patterns. The approach used in this book relies on the National Resources Conservation Service databases to delineate the distribution of each of the eight diagnostic epipedons and 19 subsurface horizons, to identify the taxonomic level at which each of these horizons is used, to develop an understanding of the role of the factors and processes in their formation and to summarize our latest understanding of their genesis. A chapter is devoted to each diagnostic horizon (or combined horizons). This book is intended to serve as a textbook in soil geography, a reference book for geographers, ecologists and geologists and a tool for soil instructors, landlookers, mappers, classifiers and information technologists.

First comprehensive understanding of factors controlling the distribution of diagnostic soil horizons

Introduction.- Methods.- Anthropic and Plaggen Epipedons.- Melanic Epipedon.- Mollic Epipedon.- Umbric Epipedon.- Ochric Epipedon.- Histic and Folistic Epipedons.- Agric Horizon.- Albic Horizon.- Argillic, Kandic and Natric Horizons.- Calcic and Petrocalcic Horizons.- Cambic Horizon.- Duripan Horizon.- Fragipan Horizon.- Glossic Horizon.- Gypic and Petrogypsic Horizons.- Ortstein and Placic Horizons.- Oxic Horizon.- Salic Horizon.- Sombric Horizon.- Spodic Horizon.- Ultramafic Soils.- Soils with Lamellae.- Soils with Plinthite.- Summary.- Future of Soil Taxonomy.