Hubbard Brook site, station Vegetation zone 5 at Hubbard Brook Experimental Forest's watershed 6, study of diameter at breast height of Fraxinus americana (white ash) in units of centimeter on a yearly timescale

The EcoTrends project was established in 2004 by Dr. Debra Peters
(Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and
Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest)
to support the collection and analysis of long-term ecological datasets.
The project is a large synthesis effort focused on improving the accessibility
and use of long-term data. At present, there are ~50 state and federally funded
research sites that are participating and contributing to the EcoTrends project,
including all 26 Long-Term Ecological Research (LTER) sites and sites funded by
the USDA Agriculture Research Service (ARS), USDA Forest Service,
US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal
(http://www.ecotrends.info). This web portal enables the continuation of data
compilation and accessibility by users through an interactive web application.
Ongoing data compilation is updated through both manual and automatic
processing as part of the LTER Provenance Aware Synthesis Tracking
Architecture (PASTA). The web portal is a collaboration between the Jornada LTER
and the LTER Network Office. The following dataset from Hubbard Brook (HBR)
contains diameter at breast height of Fraxinus americana (white ash) measurements in centimeter units
and were aggregated to a yearly timescale.

EcoTrends项目由Debra Peters博士（约拿盆地长期生态研究站，USDA-ARS约拿实验牧场）与Ariel Lugo博士（卢奎略长期生态研究站，USDA-FS卢奎略实验森林）于2004年创立，旨在支撑长期生态数据集的收集与分析工作。本项目为大型综合研究工作，核心目标在于提升长期生态数据的可获取性与复用效率。目前已有约50个由州级及联邦政府资助的研究站点参与并为EcoTrends项目贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research, LTER）站点，以及由美国农业部农业研究服务局（USDA ARS）、美国农业部林务局（USDA FS）、美国能源部、美国地质调查局（USGS）及众多高校资助的研究站点。EcoTrends项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取。该网络门户依托交互式Web应用程序，支持用户持续开展数据汇编与数据访问工作。作为长期生态研究溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续进行的数据汇编工作通过手动与自动两种处理方式完成更新。本网络门户是约拿LTER与LTER网络办公室的合作成果。以下来自哈伯德布鲁克（HBR）的数据集包含美国白蜡树（Fraxinus americana，white ash）的胸径测量数据，单位为厘米，并已按年度时间尺度完成聚合。