论文部分内容阅读
近几十年树轮年代学得到了迅速发展,现已成功建立了大量长度逾千年的树轮长年表。本文评述树轮长年表在全球变化相关研究领域中的应用。树轮长年表可为~(14)C定年提供校准曲线,从而将样本的~(14)C年龄转化为日历年龄,提高了~(14)C测年的精度;也可为环境考古如古木建筑及墓葬等提供定年服务,确定古木构建筑的建造年代;树轮长年表在地质灾害事件定年方面也发挥了重要作用。然而,树轮长年表在上述研究领域的应用也存在不足,最新的国际~(14)C会议公布的~(14)C校正曲线中能够准确定年的树轮校正部分仅为过去12 410年,目前尚无法提供更长时间尺度的树轮校正曲线。在对木构建筑进行定年时受到古木样本量不足的限制等。因此,为了更好地发挥树轮长年表的应用潜力,应不断发掘与延长现有树轮宽度长年表,同时建立长年表的C、O同位素序列,以期为长年表的应用不断做出贡献。
Tree-ring geochronology has been rapidly developed in recent decades and a large number of tree-ring chronologies have been established successfully for more than a thousand years. This article reviews the application of the tree ring chronology in the field of global change related research. The tree-ring chronological table provides a calibration curve for ~ (14) C dating, which transforms the ~ (14) C age of the sample into a calendar age and improves the accuracy of ~ (14) C dating; it can also be used for environmental archeology Ancient buildings and tombs to provide dating services, to determine the construction of ancient wooden buildings age; tree ring chronology of geological disasters in the event also played an important role. However, tree ring chronology is not sufficient for the above research fields. The tree ring correction that can be accurately fixed in the ~ (14) C calibration curve published by the latest International Conference of the 14th C is only the last 12 410 years , It is not possible to provide tree-wheel calibration curves for longer time scales. In the wood structure for the time of the ancient wood sample size restrictions. Therefore, in order to make full use of the potential of tree ring chronology, we should continuously explore and extend the existing chronology of tree ring width and establish the C and O isotopic sequence of chronological table, in order to continuously use the chronological table make a contribution.