LegacyTreeData v2

A repository of individual tree measurements of volume, weight, and physical properties. As of April 2023 the collection included records from over 290,000 trees, most of which were felled, and measured for stem taper and volume. Weight measurements were compiled on over 23,000 of the trees subjected to destructive sampling. Biomass components included stem wood and bark, branches, and foliage, including 11,209 trees having direct estimates of aboveground biomass (AGB). Stem volumes are recorded for over 248,600 trees, 81% of which included stem taper measurements. Over 300 species are represented in the stem volume data, with ≥ 100 trees sampled on 114 of the species in the data set. The collection spans over 100 years of fieldwork where detailed tree measurements were collected by private companies, government agencies – primarily the US Forest Service, and university researchers. Compiling these data from past studies depended largely on people and institutions who served for decades as stewards of the data and record-keepers. The information compiled here was often derived from larger collections of data and archival materials that in some cases included study plans, field notes, or other pertinent information. We preserved as much of this as was practical in supplementary files not archived here but available through a searchable, downloadable database online at https://www.legacytreedata.org.

本数据集为单株树木材积、重量及物理属性的测量数据库。截至2023年4月，数据集共收录超过29万株树木的测量记录，其中多数为伐倒木，已完成树干削度与材积的测定。针对超过2.3万株经破坏性采样的树木，已完成重量测量数据的汇编。生物量组分涵盖树干木质部、树皮、枝条及叶片，其中11209株树木拥有地上生物量（aboveground biomass, AGB）的直接估算值。超过24.86万株树木记录了树干材积，其中81%附带树干削度测量数据。树干材积数据涵盖300余个树种，其中114个树种的采样植株数≥100株。本数据集的测量数据源自逾百年的野外调查工作，参与数据采集的主体包括私营企业、政府机构（主要为美国林务局（US Forest Service））及高校研究人员。本次对既往研究数据的汇编工作，主要依托数十年来长期担任数据管理者与档案保管员的个人与机构完成。本次汇编的数据集信息大多源自更大型的数据集合与档案资料，部分资料包含研究方案、野外记录或其他相关信息。我们已尽可能将此类资料整理为补充文件，虽未随本数据集一同归档，但可通过在线可检索、可下载的数据库https://www.legacytreedata.org获取。