Tree-ring width measurements of Douglas fir from Oybin from 1933 to 2021@en

Wood samples from Douglas fir trees were taken using an increment borer. From each tree two opposing increment cores were taken at breast height. The sampled trees stood in an area of ~50x50 meters. Total ring width was measured and digitized. The resulting two radii measurements of each tree were visually synchronized and averaged to form a tree-ring series. Additionally, metadata were collected such as tree height, circumference and provenance (coastal, interior). The tree-ring data were used to investigate the resilience, resistance and recovery of the Douglas fir trees to severe drought events and to perform climate sensitivity analysis. This tree-ring dataset was part of a sampling campaign to assess the growth potential of Douglas fir trees until the year 2100. Annual tree growth variability until 2100 was modeled for Germany (including the river basins draining to Germany) with a spatial resolution of 12x12 km using regional climate projections ensemble.研究人员采用树木生长钻（increment borer）采集花旗松（Douglas fir）的木材钻芯样本：每株供试树木在胸高位置采集两枚相对的生长钻芯。所有采样树木分布于一处约50×50米的区域内。研究人员对年轮总宽度进行测量并数字化处理，针对每株树木的两枚钻芯对应的半径测量值，经目视配准后取平均值，以此构建单株树木的年轮序列（tree-ring series）。此外还采集了树木高度、胸径以及种源（沿海、内陆）等元数据。该年轮数据集被用于探究花旗松对极端干旱事件的抗性、恢复弹性与灾后恢复能力，并开展气候敏感性分析。本年轮数据集属于一项采样调查计划的组成部分，该计划旨在评估花旗松直至2100年的生长潜力。研究团队利用区域气候预测集合（regional climate projections ensemble）数据集，以12×12千米的空间分辨率，对德国全境（含汇入德国的河流流域）范围内直至2100年的树木年生长变异性进行了模拟。