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A Model to Predict Soil Aggregate Stability Dynamics following Organic Residue Incorporation under Field Conditions

^a Univ. of Zurich, Winterthurerstr. 190, Zurich 8057, Switzerland
^b INRA, Agrocampus Rennes, UMR Sol, Agronomie Spatialisation, 65 Rue de Saint-Brieuc, CS 84215, 35042 Rennex Cedex, France
^c Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Ste. Foy, QC G1V 2J3, Canada

View larger version (11K): [in this window] [in a new window]   Fig. 1. Monnier's (1965) conceptual model of temporal variations in aggregate stability following organic substrate incorporation.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Description of the Pouloud model structure, describing aggregate stability (AS) dynamics under controlled and field conditions, as a function of time; A, B, and C are the magnitude, scale, and shape parameters of the lognormal function obtained from laboratory results.

View larger version (11K): [in this window] [in a new window]   Fig. 3. Aggregate stability dynamics under controlled conditions. Measured values (filled symbols) and adjusted values (empty symbols) were calculated with Eq. [2].

View larger version (11K): [in this window] [in a new window]   Fig. 4. Principle component analysis relating organic input characteristics and the A, B, and C parameters of Eq. [2]. NDF = neutral detergent fiber, Ext. Polys. = water-extractable polysaccharides.

View larger version (14K): [in this window] [in a new window]   Fig. 5. Sensitivity analysis of the model to theoretical variations in organic substrate characteristics for (a) cauliflower, (b) straw, (c) manure, and (d) compost. Dotted lines represent the standard error corresponding to a variability of 0.10 mm of the aggregate stability value. Lig = lignin, Ext. Pol. = water-extractable polysaccharides, Hem. + Cell = hemicellulose and cellulose.

View larger version (9K): [in this window] [in a new window]   Fig. 6. Simulation of the effect of (a) cauliflower, (b) straw, (c) manure, and (d) compost on aggregate stability compared with field measurements.

View larger version (18K): [in this window] [in a new window]   Fig. 7. Simulation of the effect of (a) cauliflower and (b) straw on aggregate stability with 4 climatic yr and two input dates.