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Soil Aggregation and Glomalin under Pastures in the Southern Piedmont USA

^a USDA-ARS, J. Phil Campbell Sr. Natural Resource Conservation Center, 1420 Experiment Station Rd., Watkinsville, GA 30677-2373 USA
^b USDA-ARS, Soil Microbial Systems Lab., BARC-W, Bldg. 001, Beltsville, MD 20705 USA

View larger version (28K): [in a new window]   Fig. 1 Water-stable macroaggregation (>0.25 mm) and its stability (wet/dry) and mean-weight diameter of water-stable aggregates and its stability (wet/dry) as affected by stand age of grazed Kentucky-31 tall fescue and hayed Coastal bermudagrass in soil at a depth of 0 to 200 mm (Contrast 3). Error bars are LSD among all combinations of stand age and grass species

View larger version (34K): [in a new window]   Fig. 2 Water-stable macroaggregation (>0.25 mm) and its stability (wet/dry) and mean-weight diameter of water-stable aggregates and its stability (wet/dry) as affected by stand age and harvest management of Coastal bermudagrass in soil at a depth of 0 to 20 mm (Contrast 5). Error bars are LSD among all combinations of stand age and grass management

View larger version (27K): [in a new window]   Fig. 3 Total glomalin in 1.0- to 4.75-mm dry-stable aggregates as affected by soil depth, stand age, and harvest management of Coastal bermudagrass (Contrast 5). Error bars are LSD among all combinations of stand age and grass management

View larger version (22K): [in a new window]   Fig. 4 Total and immunoreactive glomalin in 1.0- to 4.75-mm dry-stable aggregates as affected by soil depth and stand age of Coastal bermudagrass (Contrast 5). Error bars are LSD among stand ages within a soil depth

View larger version (35K): [in a new window]   Fig. 5 Water-stable aggregate distribution among four size classes as affected by clay content of soil at a depth of 0 to 50 mm for each of the four replications of each of the 14 management systems in Contrasts 1 to 4 . Dashed line is regression of dry-stable aggregate distribution within each size class (data points not shown). and *** indicate significance at the 0.1 and 0.001 levels of probability, respectively

View larger version (35K): [in a new window]   Fig. 6 Total and immunoreactive glomalin of 1.0- to 4.75-mm dry-stable aggregates in relationship with organic C of whole soil for all data in Contrasts 1 to 5