¹³⁷Cs, soil components were measured in 56 samples taken across 5 cultivated hill slopes.

Compositions and redistribution pathways of 5 soil aggregates were identified by PMF.

73% ¹³⁷Cs was found in SOC-sand aggregates, 17% in clay, and 10% as dissolved cations.

Labile light SOC aggregated with sand, stable heavy SOC aggregated with clay.

Labile and stable SOC fractions account for 47% and 44% of SOC content, respectively.