DATA from: Jack pine of all trades: deciphering intraspecific variability of a key adaptive trait at the rear edge of a widespread fire-embracer North American conifer

Data from: Jack pine of all trades: deciphering intraspecific variability of a key adaptive trait at the rear edge of a widespread fire-embracer North American conifer. American Journal of Botany. A MSExcel spreadsheet reporting results of 1) an experiment whereby closed jack pine (Pinus banksiana) cones were submitted to incrementing temperatures, and 2) a seed germination tests in order to investigate if and how various ecological factors (cone age, branch height, tree size, tree age) are related to cone dehiscence and seed viability in jack pines from the rear-edge (n = 17 sites) and the core (n = 7 sites) of the species’ range in eastern Canada. <br> <br> Sheet 1 - Metadata. Provides details about the study sites (Region, Site abbreviation, Site name, Sampling date, Longitude, Latitude, Altitude) <br> Sheet 2 - Stand-scale serotiny. At each site, up to 100 mature jack pine individuals were assigned to to one of six serotiny levels: class 0 (0% closed cones), class 1 (1−25% closed cones), class 2 (26−50% closed cones), class 3 (51−75% closed cones), class 4 (76−99% closed cones), or class 5 (100% closed cones). The diameter at breast height (DBH) of each tree sampled for serotiny is also provided in this sheet. <br> Sheet 3 - Experiments. At each site, 10 randomly-chosen mature jack pines were sampled. Three cone-bearing branches from different measured heights (lower, middle, and upper parts of the tree crown) were cut. For each tree, diameter at breast heigth (Tree DBH) was recorded and a core was sampled using a Pressler increment borer as close to the ground as possible. At the laboratory, three fully closed cones of contrasted ages were sampled from each branch (n = 1381 cones). Cone age and tree age was determined by counting growth rings. The cone opening temperatures correspond to the temperature required to reach each opening level, which refers to the relative abundance of opened scales on each individual cone (level 1: 1-25% opening, level 2: 26-50% opening, level 3: 51-75% opening and level 4: 76-100% opening). For each cone, the total number of seeds and the number of filled seeds were recorded. The filled seeds of each cone were batch-weighed. A total of 23,404 seeds were set to germinate. Every day (n = 33 days), germinated seeds (radicle &gt; 2 mm) were counted.

数据来源：《多面性北美短叶松（Pinus banksiana）：解析广泛分布的火依赖型北美针叶树种分布区边缘关键适应性性状的种内变异》，刊载于《美国植物学杂志》（American Journal of Botany）。

本数据集为微软Excel（Microsoft Excel）表格文件，包含两项试验的结果：1）北美短叶松闭合球果的梯度升温试验；2）种子发芽试验，旨在探究加拿大东部地区该物种分布区边缘（17个样地）与核心区（7个样地）的北美短叶松，其各项生态因子（球果年龄、枝条着生高度、树木体量、树木年龄）与球果开裂特性及种子活力之间的关联。

工作表1：元数据。包含样地详细信息：区域、样地缩写、样地名称、采样日期、经度、纬度、海拔。

工作表2：林分尺度诱发性特性。每个样地选取最多100株成熟北美短叶松个体，将其划分为6个诱发性特性等级：等级0（0%球果闭合）、等级1（1%~25%球果闭合）、等级2（26%~50%球果闭合）、等级3（51%~75%球果闭合）、等级4（76%~99%球果闭合）、等级5（100%球果闭合）。本工作表同时记录了用于诱发性特性调查的每株样树的胸径（DBH, Diameter at Breast Height）。

工作表3：试验数据。每个样地随机选取10株成熟北美短叶松。从每株样树树冠的不同高度（下部、中部、上部）各截取一根带有球果的枝条。针对每株样树，记录其胸径（Tree DBH），并使用普雷瑟式树木生长钻（Pressler increment borer）在尽可能贴近地面的位置采集树木生长芯。实验室阶段：从每根枝条上选取3个年龄差异显著的完全闭合球果，共计1381个球果。球果年龄与树木年龄通过计数生长轮确定。球果开裂温度指达到各开裂等级所需的温度，各等级对应单颗球果上鳞片开裂的相对比例：等级1（1%~25%鳞片开裂）、等级2（26%~50%鳞片开裂）、等级3（51%~75%鳞片开裂）、等级4（76%~100%鳞片开裂）。针对每颗球果，记录其总种子数与饱满种子数，并对单颗球果的饱满种子进行批量称重。本试验共计使用23404粒种子开展发芽试验，试验周期为33天，每日统计胚根长度大于2mm的发芽种子数量。