H. J. Andrews Experimental Forest site, station Andrews Watershed 1, study of plant cover of Polystichum munitum 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 Polystichum munitum measurements in percent units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（约拿盆地长期生态研究（Long-Term Ecological Research，LTER）、美国农业部农业研究服务局约拿实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究（Long-Term Ecological Research，LTER）、美国农业部林务局卢奎洛实验林）于2004年创立，旨在支持长期生态数据集的采集与分析。该项目是一项大型综合研究工作，致力于提升长期数据的可获取性与使用率。目前共有约50个由州政府与联邦政府资助的研究站点参与EcoTrends项目并贡献数据，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 Agricultural Research Service，ARS）、美国农业部林务局、美国能源部、美国地质调查局（United States Geological Survey，USGS）及众多高校资助的站点。EcoTrends项目的数据集可通过探索性网络门户（http://www.ecotrends.info）获取。该网络门户通过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。持续进行的数据汇编工作会通过手动与自动两种处理方式完成更新，该流程作为长期生态研究网溯源感知综合跟踪架构（LTER Provenance Aware Synthesis Tracking Architecture，PASTA）的一部分运行。该网络门户是约拿盆地长期生态研究网与LTER网络办公室的合作成果。以下来自H.J.安德鲁斯实验林（AND）的数据集包含以百分比为单位的多刺耳蕨（Polystichum munitum）盖度测量数据，且已聚合至年度时间尺度。