Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ<sup>14</sup>C values of these profiles decrease with increasing of depth. The Δ<sup>...Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ<sup>14</sup>C values of these profiles decrease with increasing of depth. The Δ<sup>14</sup>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 <sup>14</sup>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and broad-leaf mixed forests around Wukesong profile have been developing since 425 a BP, which is consistent with historical documents.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 <sup>14</sup>C" in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively.展开更多
文摘Organic carbon in forest soils of Qingyunsi and Wukesong profiles can be divided into fast and slow components. Δ<sup>14</sup>C values of these profiles decrease with increasing of depth. The Δ<sup>14</sup>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 <sup>14</sup>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and broad-leaf mixed forests around Wukesong profile have been developing since 425 a BP, which is consistent with historical documents.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 <sup>14</sup>C" in Qingyunsi and Wukesong profiles are 10 and 20 cm, respectively.
