中文摘要：

黄土土壤序列标明日期的精确放射性碳在最后冻结成冰和 Holocene 期间在大陆人背景在环境、气候的变化的重建起一个必要作用。然而，我们土壤和黄土样品的各种各样的部分的放射性碳年龄的可靠性的知识仍然是不够的。这里，我们在场我们在放射性碳年龄的学习结果在西方的中国黄土高原从 loess-paleosol 节基于样品的体积有机物， humin 部分，和碳酸盐收集了。我们把这些观察与光学地刺激的光年龄和炭放射性碳年龄作比较评估这些部分的可靠性。我们观察到 humin 部分的放射性碳年龄离炭的那些很靠近并且与在试验性的错误以内的光学地刺激的光年龄一致。我们观察到在从那些的碳酸盐和炭和光学地刺激的光的体积有机物的放射性碳年龄的重要偏差变老，由于这些部分的冲淡可能在 pedogenetic 过程期间。我们的结果表明除了炭， humin 部分可以让步可靠 < 啜 class= “ a-plus-plus ” > 14 为中国黄土土壤顺序的 C 年龄。

英文摘要：

The accurate radiocarbon dating of loess-soil sequences plays an essential role in the reconstruction of the environmental and climatic changes in continental settings during the last glaciation and Holocene. However, our knowledge about the reliability of radiocarbon ages of various fractions of soil and loess samples is still insufficient. Here, we present our study results on radio- carbon ages based on bulk organic matter, humin fraction, and carbonate of samples collected from a loess-paleosol section in the western Chinese Loess Plateau. We compare these observations with the optically stimulated luminescence ages and charcoal radiocarbon ages to evaluate the reliability of these fractions. We observed that the radio- carbon ages of humin fraction are very close to those of charcoal and are consistent with the optically stimulated luminescence ages within the experimental errors. We observed a significant deviation in the radiocarbon ages of carbonate and bulk organic matter from those of charcoal and optically stimulated luminescence ages, likely due to the dilution of these fractions during the pedogenetic process. Our results reveal that, except for charcoal, the humin fraction may yield reliable laC ages for the Chinese loess-soil sequence.