Nature of carbohydrates associated with water-stable aggregates of two cultivated soils

alfisols arable soils carbohidratos carbohydrates crop residues dimension dimensions estabilidad fracciones del suelo fraction du sol glucide grosseur des particules loess loess soils luvisol luvisoles luvisols microorganisme microorganismos microorganisms organic matter particle size residuos de cosechas silty soils size soil soil separates soil structural units sol sol arable sol de loess sol limoneux stabilite stability suelo suelo limoso suelos cultivables unidades estructurales de suelos