A combination of wildfires and defoliating insect outbreaks play an important role in the natural successional dynamics of North American boreal mixedwood forests, which, in the long term, change the post‐disturbance composition and structure of forest stands. After stand‐replacing disturbances (mainly wildfires), early successional hardwoods typically dominate the affected areas. Provided enough time following disturbances, the increasing recruitment of mid‐ to late‐successional softwoods as well as the mortality of hardwoods gradually change forest composition from hardwoods to admixtures of hardwood‐conifer species and conifer‐dominated stands in mid and late successional stages, respectively. Such mixedwoods are abundant across the southern Canadian boreal forest. In boreal Canada, mixedwoods are the most structurally heterogeneous forest ecosystems, are highly productive, and form an important source of timber supply. Here we present the EASTERN BOREAL MIXEDWOODS CANADA data set, which documents the changes in composition and structure of stands originating from eight different wildfires representing a chronosequence of 249 yr since fire in eastern Canada. This data set has been used in several different projects to study and model the influence of natural (e.g., insect outbreaks) and anthropogenic disturbances (e.g., harvesting) on the dynamics of post‐fire stands. The data set covers a high range of variability in stand composition and structure, explained by species establishment, dominance, and mixture. It thus constitutes a useful source of information to trace the dynamics of the main boreal tree species of eastern North America, from their establishment to their replacement at different spatial scales (e.g., from stand to landscape level). Please cite this data paper when the data are used in publications. We also request that researchers and teachers inform us of how they are using the data. We are open to collaborate in developing or co‐authoring relevant research projects based on this data set.

中文翻译：

---

加拿大东部北方混交林连续八次大火造成的森林地块的249年时序变化

野火和落叶昆虫暴发的结合在北美寒带混交林的自然演替动态中起着重要作用，从长远来看，这改变了林木扰动后的组成和结构。在替换林分的干扰（主要是野火）之后，早期演替硬木通常在受影响地区占主导地位。在发生干扰后有足够的时间，中至晚成功的软木的增加采伐以及硬木的死亡率逐渐将森林组成从硬木变为硬木针叶树种和针叶树为主的林分，分别在演替中期和后期。 。这种混合木材遍布加拿大南部的北方森林。在加拿大北方 混合木材是结构上最异质的森林生态系统，生产力高，并且是木材供应的重要来源。在这里，我们介绍了加拿大东部混合木材的数据集，该数据集记录了源自八种不同野火的林分组成和结构的变化，这些野火表明自加拿大东部火灾以来的时间序列为249年。该数据集已用于多个不同的项目中，以研究和模拟自然（例如，昆虫暴发）和人为干扰（例如，收割）对火灾后林分动态的影响。数据集涵盖了林分组成和结构的高度可变性，可以通过物种建立，优势和混合来解释。因此，它构成了有用的信息来源，可追踪北美东部主要的北方树种的动态，从其建立到在不同空间尺度上的替换（例如，从林分到景观水平）。在出版物中使用数据时，请引用本数据文件。我们还要求研究人员和老师告知我们他们如何使用数据。我们愿意根据此数据集合作开发或共同撰写相关的研究项目。