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Aggregate Disintegration and Wettability for Long-Term Management Systems in the Northern Appalachians

^a Carbon Management and Sequestration Center, FAES/OARDC, School of Natural Resources, Ohio State Univ., 210 Kottman Hall, 2021 Coffey Rd., Columbus, OH 43210-1085
^b USDA-ARS, North Appalachian Experimental Watershed, P.O. Box 488, Coshocton, OH 43812-0488

View larger version (27K): [in this window] [in a new window]   Fig. 1. Geometric mean kinetic energy of raindrops required to disintegrate soil aggregates by soil water potentials for moldboard plow (MP), no-till (NT), no-till with manure (NTm), pasture, and forest management for the 0- to 10-cm soil depth. The error bars are the LSD values comparing treatment effects within each aggregate size, whereas the numerical values are the LSDs comparing effects of aggregate size within each treatment.

View larger version (15K): [in this window] [in a new window]   Fig. 2. (A) Mean water drop penetration time (WDPT) for moldboard plow (MP), no-till (NT), no-till with manure (NTm), pasture, and forest management, and (B) relationship of geometric mean kinetic energy of raindrops needed for aggregate disintegration with WDPT within the surface 0- to 10-cm soil depth.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Mean runoff depth and soil loss as a function of the kinetic energy of raindrops for aggregate disintegration and water drop penetration time (WDPT) for moldboard plow (MP), no-till without manure (NT), pasture, and forest management for the 0- to 10-cm soil depth. Because data on soil loss for the no-till with manure treatment were not available, this treatment was not included in the graph. Data on runoff and soil loss reported by Rhoton et al. (2002) and Jacinthe et al. (2004) were used in the study.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Relationship of (A) geometric mean kinetic energy of raindrops needed for aggregate disintegration and (B) water drop penetration time (WDPT) with soil organic C concentration across the five treatments for the 6- to 8-mm aggregates within the surface 0- to 10-cm soil depth.

View larger version (24K): [in this window] [in a new window]   Fig. 5. Relationship of geometric mean kinetic energy of raindrops needed for aggregate disintegration and water drop penetration time (WDPT) with density and tensile strength for the 6- to 8-mm aggregates within the surface 0- to 10-cm soil depth.