H. J. Andrews Experimental Forest site, station Andrews Watershed 1, study of plant cover of Arnica discoidea (rayless arnica) in units of percent 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 H. J. Andrews Experimental Forest (AND)
contains plant cover of Arnica discoidea (rayless arnica) measurements in percent 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网，美国农业部农业研究服务局约拿实验牧场）与Ariel Lugo博士（卢奎约长期生态研究网，美国农业部林务局卢奎略实验森林）于2004年创立，旨在支持长期生态数据集的采集与分析工作。该项目为一项大型综合研究项目，核心目标在于提升长期数据的可获取性与利用率。目前，已有约50个州立及联邦资助的研究站点参与EcoTrends项目并贡献相关数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research, LTER）站点，以及美国农业部农业研究服务局（ARS）、美国农业部林务局、美国能源部、美国地质调查局（USGS）与众多高校资助的研究站点。EcoTrends项目的数据集可通过探索性网络门户（http://www.ecotrends.info）获取，该门户依托交互式网络应用程序，支持用户持续开展数据汇编与数据获取工作。作为长期生态研究网溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续更新的数据汇编工作通过手动与自动两种处理方式完成。该网络门户由约拿LTER站点与LTER网络办公室联合开发运营。以下来自H.J.安德鲁斯实验森林（AND）的数据集，包含以百分比为单位的无舌状花山金车（Arnica discoidea, rayless arnica）植物盖度测定数据，且已按年度时间尺度进行聚合。