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Fig. 4. Proportion of <4-mm C in size fractions of Pacific Northwest old-growth forest soils, as affected two different treatments: periodic swirling with sodium hexametaphosphate for 12 h, or constant shaking with sodium hexametaphosphate for 12 h. Each value is based on five soil samples that have C in both the <2 and 2- to 4-mm fractions. The LSD bars are based on randomized block ANOVA (soil is block) for each province, followed by LSD test ( = 0.05).

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