Boettger Tatjana, Friedrich Michael
Department of Isotope Hydrology, UFZ, Helmholtz Centre for Environmental Research, Halle, Germany.
Isotopes Environ Health Stud. 2009 Mar;45(1):68-80. doi: 10.1080/10256010802522218.
The study presents a new serial pooling method of shifted tree ring blocks for the building of isotope chronologies. This method combines the advantages of traditional 'serial' and 'intertree' pooling, and can be recommended for the construction of sub-regional long isotope chronologies with sufficient replication, and on annual resolution, especially for the case of extremely narrow tree rings. For Scots pines (Pinus sylvestris L., Khibiny Low Mountains, NW Russia) and Silver firs (Abies alba Mill., Franconia, Southern Germany), serial pooling of five consecutive tree rings seems appropriate because the species- and site-specific particularities lead to blurs of climate linkages in their tree rings for the period up to ca. five years back. An equivalent to a five-year running means that curve gained on the base annual data sets of single trees can be derived from the analysis of yearly shifted five-year blocks of consecutive tree rings, and therefore, with approximately 20% of the expense. Good coherence of delta(13)C- and delta(18)O-values between calculated means of annual total rings or late wood data and means of five-year blocks of consecutive total tree rings analysed experimentally on most similar material confirms this assumption.
该研究提出了一种用于构建同位素年代序列的新的移动树轮块连续合并方法。这种方法结合了传统“连续”和“树间”合并的优点，可推荐用于构建具有足够重复且分辨率为年度的次区域长同位素年代序列，特别是对于树轮极窄的情况。对于苏格兰松（Pinus sylvestris L.，俄罗斯西北部希比内低山）和欧洲冷杉（Abies alba Mill.，德国南部弗兰肯地区），连续五个树轮的连续合并似乎是合适的，因为特定物种和地点的特殊性导致其树轮中长达约五年前的气候联系模糊不清。相当于五年移动平均的曲线可以从对连续树轮的逐年移动五年块的分析中得出，而基于单棵树的年度数据集获得该曲线的成本约为其20%。在最相似材料上对年度总树轮或晚材数据的计算平均值与连续总树轮的五年块的实验分析平均值之间，δ(13)C和δ(18)O值具有良好的一致性，证实了这一假设。
