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本文结出鼎湖山五棵松、庆云寺和坑口 ３个森林土壤剖面有机碳１４Ｃ表观年龄，该地区成壤过程持续时间约为 ５００～ １０００ａ；最大１４Ｃ表观年龄分别为 ５ ５７２± ９４ａＢ．Ｐ．， ８ ６６３±１１２ａＢ．Ｐ和２８８３±７７ａＢ．Ｐ．３个剖面有机碳及其δ１３Ｃ变化均可分成２段：表面至约４０ｃｍ段，δ１３Ｃ变化范围分别为－２７４‰～－２４．１‰，－２７．５‰～－２２．２‰和－２４．４‰～－２０．１‰，有机碳含量变率大，有机质由“活动型”有机碳构成 ５约４０ｃｍ至约１６０ｃｍ段，δ１３Ｃ和有机碳趋于稳定，有机质由“稳定型”有机碳构成。剖面有机碳δ１３Ｃ平均值不但可用于Ｃ３，Ｃ４植被之区分，还可用于阔叶林、针叶林等植被类型之区分。
In this paper, the apparent carbon 14C of soil organic carbon in the soil profiles of Wukesong, Qingyun Temple and Hang Hau of Dinghushan Mountain is concluded. The duration of soil forming process in this area is about 500 ~ 1000a. The maximum apparent 14C ages are 5 572 ± 94aB . P. , 8 663 ± 112aB. P and 2883 ± 77aB. P. The changes of organic carbon and its δ13C in three sections can be divided into two sections: from the surface to about 40cm section, the δ13C ranges from -274 ‰ to -24.1 ‰, -27.5 ‰ to -22.2 ‰ and -24 .4 ‰ ~ -20.1 ‰. The organic carbon content is variable. The organic matter consists of “active” organic carbon in the range of about 40 cm to about 160 cm. The δ13C and organic carbon tend to be stable. The organic matter consists of “stable” organic carbon constitute. The average organic carbon δ13C in the section can not only be used for distinguishing between C3 and C4 vegetation, but also for distinguishing the types of vegetation such as broad-leaved forest and coniferous forest.