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Soil Organic Matter Pools and Carbon-13 Natural Abundances in Particle-Size Fractions of a Long-Term Agricultural Field Experiment Receiving Organic Amendments

^a Department of Environmental Research, Austrian Research Centers Seibersdorf, A-2444 Seibersdorf, Austria
^b Department of Soil Sciences, Swedish University of Agricultural Sciences, Box 7014, S-750 07 Uppsala, Sweden

View larger version (17K): [in a new window]   Fig. 1. Portions of bulk soil organic C in particle-size fractions (in percentage; y) in relation to bulk soil organic C concentrations of the Ap horizon (0–20 cm; x). Linear regression functions: >200 µm: y = 0.042x + 0.651, R2 = 0.780**; 200–63 µm: y = 0.182x + 0.743, R2 = 0.841**; 63–2 µm: y = 0.733x + 46.2, R2 = 0.926***; 2–0.1 µm: y = -0.795x + 44.7, R2 = 0.991***; <0.1 µm: y = -0.193x + 8.503, R2 = 0.777**. *, **, and *** Significant at the 0.05, 0.01, and 0.001 probability levels