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Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ~(14)C values of these profiles decrease with increasing of depth. The Δ~(14)C values in 30—40 cm depth interval of Wukesong profile are decreasing sharply until a very low value,showing that a strong geological environment change occurred about 1 560 years ago. The ~(14)C apparent ages of Wukesong profile show that the coniferous and broad-leaf mixed forests around Wukesong profile have been developing since 425 a BP, which is consistent with historical documents. The penetrating depths of “bomb ~(14)C” in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively.
Δ ~ (14) C values of these profiles decrease with increasing of depth. The Δ ~ (14) C values in 30-40 cm depth interval of Wukesong profile are decreasing sharply until a very low value, showing that a strong geological environment change occurred about 1 560 years ago. The ~ (14) C apparent ages of Wukesong profile show that the coniferous and broad-leaf mixed forests around Wukesong profile The penetrating depths of “bomb ~ (14) C ” in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively.