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Bulk Humin - CLU-IN

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Density Fractionation of SOM<br />

Simplifying SOM Fractionation<br />

Density Separation<br />

Light Fraction Heavy Fraction<br />

Labile C<br />

Fast C cycling<br />

<strong>Bulk</strong> Sediment<br />

CsCl<br />

Occluded Light<br />

Fraction<br />

More degraded;<br />

recalcitrant due to<br />

microbial degradation of<br />

Light Fraction<br />

Sonication<br />

Heavy<br />

Fraction<br />

Fast C cycling pools<br />

Slow C cycling pools<br />

Plant Carbon<br />

PAH<br />

(Swanston et al., 2004)

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