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Macro- and Micromorphology of Subsurface Carbon in Riparian Zone Soils

^a Dep. of Natural Resources Science, Univ. of Rhode Island, Kingston, RI 02881
^b Inst. of Ecosystem Studies, Box AB, Millbrook, NY 12545

View larger version (27K): [in a new window]   Fig. 1. Location of the seven sites in relation to the Pawcatuck River Watershed in Rhode Island, USA.

View larger version (140K): [in a new window]   Fig. 2. Cross-sectional and longitudinal views of the different root decomposition classes. (A) Class 0 root, inner portion and sheath are complete. (B) Class 1 root, innter portion and sheath are incomplete. (C) Class 2 root, C is dispersing into surrounding soil, tissue fragments are still present. (D) Class 3 root, visible tissues are absent, root shape is discernible. (E) Class 4 root, visible tissues are absent, original root shape is indefinite. The bar in the lower corner = 0.5 mm.

View larger version (165K): [in a new window]   Fig. 3. Micrograph showing examples of various C forms in riparian zone subsoils. (A) Example of fragmental organic matter. Frame width is approximately 6 mm. (B) Examples of lenses in an A/C horizon with a silt loam texture. The C associated with the lenses has a porphyric related distribution pattern. Frame width is approximately 6 mm. (C) Example of enaulic C in an A horizon with a sandy loam texture. The C associated with the dark aggregates is termed enaulic C. Frame width is approximately 1.2 mm. (D) Example of a mass. Frame width is approximately 6 mm.

View larger version (93K): [in a new window]   Fig. 4. Illuvial C at the macroscopic and microscopic scale. (Top) illuvial patches observed at the Pendar Road study site; (bottom) example of chitonic C on sand grains. Frame width is approximately 1.2 mm.