A Comparison of Physical Soil Organic Matter Fractionation Methods for Amended Soils

Figure 2

C concentration of (a) unprotected, (b) physically protected, and (c) chemically protected C fractions using different fractionation methods for amended soils. Error bars for standard error (n = 3). Methods sharing the same lowercase letter and treatments sharing the same uppercase letter are not significantly different according to two-way ANOVA and Tukey's post hoc testing (p < 0.05). Methods: PL: Plaza et al. [18]; SD: Six et al. [9] using microaggregate isolator and density flotation; SMI: Six et al. [9] using microaggregate isolator and NaHMP for dispersion; SO: Sohi et al. [19]; ZM: Zimmermann et al. [15]. Samples: BP: bare plot control; GCf: garden compost (full rate); GCh: garden compost (half rate); H: composted horse manure; Pt: Irish peat moss.

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