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Soil Quality for Sustainable Land Management

Organic Matter and Aggregation Interactions that Maintain Soil Functions

Martin R. Carter*

Agric. and Agri-Food Canada, 440 Univ. Ave., Charlottetown, PE, C1A 4N6 Canada



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Fig. 1. Relation between soil organic C and soil erodibility (i.e., turbidity) in a Vertisol (Cryert) and Ferrallitic (Oxisol) soil. There is a critical limit of >20 g C kg-1 to reduce erodibility in the Vertisols. Data derived from Feller et al. (1996).
 


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Fig. 2. Relation between soil organic C and macroaggregation over time in a Chernozemic (Boroll) soil. Maximum macroaggregation is >40 g C kg-1. Data derived from Jastrow and Miller (1997).
 


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Fig. 3. Comparison of change in soil organic C in relation to total organic C inputs at three different locations (after Parton et al., 1996).

 


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Fig. 4. Association of soil organic C in whole soil, organic matter fractions, and aggregates, and changes in water-stable aggregates in a Charlottetown fine sandy loam (Haplorthod) under two cropping systems. Organic C in clay plus silt particles estimated using the model of Hassink and Whitmore (1997). Error bars indicate standard error.

 


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Fig. 5. Conceptual model of soil organic matter (SOM) content and proportion in soil particles and aggregates of a Charlottetown fine sandy loam (Haplorthod) illustrating different measurable capacity levels. OM, organic matter.

 





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