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Carbon Sequestration in Clay Mineral Fractions from ¹⁴C-Labeled Plant Residues

^a Dep. of Agronomy, Iowa State University, Ames, IA 50011
^b USDA-ARS Appalachian Farming Systems Research Center, 1224 Airport Rd., Beaver, WV 25813
^c USDA-ARS National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (28K): [in a new window]   Fig. 1. X-ray diffraction patterns of silt and clay fractions from a Monona soil (S/I: smectite/illite; I: illite; K: kaolinite; Q: quartz; F: feldspars).

View larger version (102K): [in a new window]   Fig. 2. Scanning electron micrographs of the silt and clay fractions of a Monona soil; (a) silt, (b) coarse clay, (c) medium clay, and (d and e) fine clay (low and high resolution, respectively).