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Distribution of 14C and 13C in Forest Soils of the Dinghushan Biosphere ReserveShen, Chengde; Yi, Weixi; Sun, Yanmin; Xing, Changping; Yang, Ying; Yuan, Chao; Li, Zhian; Peng, Shaolin; An, Zhisheng; Liu, Tungsheng (Department of Geosciences, The University of Arizona, 2001-01-01)We report here first results on the bulk soil organic carbon (SOC), apparent radiocarbon ages and delta-13C characteristics of the tropical and subtropical forest soil in Dinghushan Biosphere Reserve (DHSBR). The forest oxisolin Dinghushan has developed during the Holocene. The delta-13C variation curves in all three profiles may be divided into two sections. The upper section from 0 to 40 cm has delta-13C values varying from -27.4 to -24.1‰, -27.5 to -22.2‰, and -24.4 to -20.1‰ in the Wukesong, Qingyunsi and Kengkou profiles, respectively. The lower section, including the 40-160 cm horizons, has a uniform delta-13C. The mean delta-13C values of the soil organic carbon could be used not only to discriminate between C3 and C4 plants, but also to distinguish between coniferous and broad-leaf plants.