Overstory and regeneration data from the "Rehabilitation of cutover mixedwood stands" study at the Penobscot Experimental Forest: 2nd edition

This data package contains crop tree, overstory, sapling, and regeneration data collected at the Penobscot Experimental Forest in Maine between 2008 and 2017. These data were collected as part of the project titled "Rehabilitation of cutover mixedwood stands: An economic and silvicultural assessment of alternatives" as described in Appendix C of FS-NRS-07-08-01 "Silvicultural effects on composition, structure and growth of northern conifers in the Acadian Forest Region 2008 study plan" (also known as the Compartment Management Study, see Kenefic et al. 2015). While the Rehabilitation study was conducted within two management units (MUs) of the Compartment Management Study (CMS) the data for the Rehabilitation study are independent of the CMS. The Rehabilitation study examined two levels of intervention treatments against controls in two stands that had been subjected to repeated commercial clearcutting harvests, last occurring 20 and 25 years before. The intervention treatments were 1) moderate treatment, in which crop trees were identified and released, and 2) intensive treatment, in which crop trees were released, unacceptable growing stock was removed, and fill planting of red spruce was conducted. Available data include crop tree species, locations, diameter at beast height (DBH), height, and mortality; overstory species, locations, and DBH; regeneration tally by species; and sapling species and DBH.The purpose of the Rehabilitation (Rehab) Study is to evaluate methods of rehabilitating degraded northern conifer stands. Specifically, to test the hypothesis that short-term investment in silvicultural rehabilitation of degraded stands improves the composition, quality, and productivity relative to no treatment, and that the intensity of rehabilitation will affect the degree of success in obtaining desired long-term outcomes. Findings will reveal economic consequences, and allow us to develop urgently needed management guidelines for degraded stands, thus serving a critical need in the Northern Forest.We strongly recommend that users read the study plans and accompanying documentation provided with the full data publication download before proceeding with data summary or analysis. Refer to the end of the Entity and Attributes section of the metadata for a list of commonly used acronyms and abbreviations.

This data publication is an update to the first edition of these data (Kenefic et al. 2016). We recommend the use of this second edition which includes an additional inventory completed in 2017 and other minor updates in the way data are recorded. See \Supplements\PEF_RehabStudy__DBEChanges.csv for a list of the changes between the first and second edition of these data.

本数据包包含在缅因州彭伯斯科特实验林于2008年至2017年间收集的林分树木、上层林木、幼苗及更新数据。这些数据收集于名为“退化混交林恢复：替代方案的经济和林学评估”的项目中，该项目详见FS-NRS-07-08-01“阿卡迪亚森林地区北部针叶林2008年研究计划”附录C（亦称分区管理研究，参见Kenefic等，2015年）。尽管恢复研究在分区管理研究（CMS）的两个管理单元（MU）内进行，但恢复研究的数据独立于CMS。恢复研究针对曾遭受反复商业皆伐收获的两个林分，最后一次收获发生在20年前和25年前，考察了两种干预处理水平与对照之间的差异。干预处理包括：1）适度处理，即识别并释放林分树木；2）强化处理，即释放林分树木，移除不适宜的生长材，并进行红松的填充种植。可用的数据包括林分树木物种、位置、胸高直径（DBH）、树高和死亡率；上层林木物种、位置和DBH；按物种划分的更新计数；以及幼苗物种和DBH。恢复研究（Rehab）的目的是评估恢复退化北方针叶林的方法。具体而言，旨在检验短期投资于退化林分的林学恢复是否能相对于无处理提高组成、质量和生产力，以及恢复的强度将影响获得预期长期结果的成功程度。研究结果将揭示经济影响，并允许我们制定针对退化林分亟需的管理指南，从而满足北方森林的迫切需求。我们强烈建议用户在开始数据摘要或分析之前，阅读所提供的数据完整发布的研究计划和配套文档。请参阅元数据实体和属性部分的末尾，以获取常用缩写和缩略语的列表。

本数据出版物是对第一版数据的更新（Kenefic等，2016年）。我们推荐使用此第二版，其中包含2017年完成的额外清查和其他数据记录方式的小幅更新。请参阅SupplementsPEF_RehabStudy__DBEChanges.csv，了解第一版和第二版数据之间的变化列表。