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Mechanical Properties and Organic Carbon of Soil Aggregates in the Northern Appalachians

^a Carbon Management and Sequestration Center, FAES/OARDC, School of Natural Resources, The Ohio State Univ., Columbus, OH 43210-1085
^b USDA-ARS, North Appalachian Experimental Watersheds, P.O. Box 488, Coshocton, OH 43812
^c Environmental Sci. Div., Oak Ridge National Lab., Oak Ridge, TN 37831
^d Joint Global Change Research Institute, Univ. of Maryland, College Park, MD 20740

View larger version (22K): [in a new window]   Fig. 1. Differences in geometric mean tensile strength of aggregates among moldboard plow (MP), chisel plow (CP), disk with cattle manure (DM), no-till without cattle manure (NT), no-till with cattle manure (NTM), pasture, and forest treatments.

View larger version (22K): [in a new window]   Fig. 2. Differences in densities between aggregates and bulk soil for long-term moldboard plow (MP), chisel plow (CP), disk with cattle manure (DM), no-till without cattle manure (NT), no-till with cattle manure (NTM), pasture, and forest management practices for the 0- to 10-cm depth. Error bars represent the standard deviation of the means (n = 3).

View larger version (25K): [in a new window]   Fig. 3. Moisture retention curves for the 2- to 4- and 6- to 8-mm aggregates under moldboard plow (MP), chisel plow (CP), disk with cattle manure (DM), no-till without cattle manure (NT), no-till with cattle manure (NTM), pasture, and forest treatments for the 0- to 10-cm depth.

View larger version (23K): [in a new window]   Fig. 4. Differences in soil organic carbon for moldboard plow (MP), chisel plow (CP), disk with cattle manure (DM), no-till without cattle manure (NT), no-till with cattle manure (NTM), pasture, and forest treatments by aggregate size for the 0- to 10-cm depth.

View larger version (22K): [in a new window]   Fig. 5. Geometric mean tensile strength as a function of aggregate size (A) and log-transformed tensile strength (LogTS) as a function of bulk density of aggregates (B; n = 252).

View larger version (16K): [in a new window]   Fig. 6. Response of (A) log-transformed tensile strength (LogTS) and (B) aggregate density to changes in soil organic carbon (SOC) in the 0- to 10-cm soil depth.