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Aggregate-Size Stability Distribution and Soil Stability

^a Facultad de Ciencias Forestales y Ambientales, Universidad de los Andes, Mérida, Venezuela
^b Dep. de Física, Facultad de Ciencias, Universidad de los Andes, Mérida, Venezuela
^c USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011
^d Dep. of Natural Resource Ecology and Management, Iowa State University, Ames, IA 50011

View larger version (29K): [in a new window]   Fig. 1. Experimental procedure used to assess aggregate-size stability distribution.

View larger version (25K): [in a new window]   Fig. 2. Movement of aggregates during the slaking pretreatment. S = stable aggregates, U = unstable aggregates, G = gain in aggregates from other fractions, Ti = total amount of aggregates in fraction i, and TiS = total amount of aggregates in fraction i after slaking.

View larger version (26K): [in a new window]   Fig. 3. General pathways involved during the capillary-wetted and the subsequent-slaked treatments. S = stable aggregates, U = unstable aggregates, Ti = total amount of aggregates in fraction i, TiCW = total amount of aggregates in fraction i after capillary-wetted pretreatment TiSS = total amount of aggregates in fraction i after subsequent slaked treatment.

View larger version (20K): [in a new window]   Fig. 4. Relationship between the mass of large macroaggregates >2000 µm quantified by slaked pretreatment (T1s) and stable large macroaggregates >2000 µm quantified by the subsequent-slaking treatment (T1ss). Values are expressed as percentages of soil dry and on a sand-free basis.

View larger version (15K): [in a new window]   Fig. 5. Sensitivity of f to changes in TS/(TS + TU) as a function of the total amount of sand.