Tree-ring width measurements of Douglas fir from Urschmitt from 1925 to 2021

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.本研究采用树木生长锥（increment borer）采集花旗松（Douglas fir）的木材样本：每株林木于胸高位置采集两份相对方向的树芯样本，采样区域范围约为50×50米。对单份树芯的总年轮宽度进行测量并完成数字化处理后，将单株林木的两份半径测量结果经目视对齐后取平均值，以此构建单株林木的年轮序列。此外，同步收集了林木的树高、胸径以及种源地（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、恢复力与恢复能力，并开展气候敏感性分析。本数据集隶属于一项旨在评估花旗松至2100年生长潜力的采样项目。针对德国（含所有汇入德国的流域范围），研究团队以12×12公里的空间分辨率，利用区域气候集合预测数据，对2100年前的林木年生长变异性开展了模拟。