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Fig. 2. Carbon to N ratio of physically uncomplexed organic matter isolated at different (a) solution densities (n = 535 fractions) and (b) particle sizes (n = 363 fractions). Values on X-axis are (a) the upper end of the solution density range and (b) the midpoint of the size range. Error bars represent standard deviations. Data are from published studies of agricultural, forest, and grassland ecosystems; 43 studies using density fractionation; and 24 studies using particle size fractionation methods.
