Cedar Creek Ecosystem Science Reserve site, station Old Field 47 at Cedar Creek, study of plant cover of Eragrostis spectabilis 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 Cedar Creek Ecosystem Science Reserve (CDR)
contains plant cover of Eragrostis spectabilis measurements in percent units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（约纳盆地长期生态研究网络（LTER, Long-Term Ecological Research），美国农业部农业研究服务局（USDA-ARS）约纳实验牧场）与阿里尔·卢戈博士（卢奎略长期生态研究网络（LTER, Long-Term Ecological Research），美国农业部林业局（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采集与分析工作。
该项目是一项大型综合研究计划，核心目标在于提升长期数据的可访问性与使用效率。目前已有约50个由州政府与联邦政府资助的研究站点参与并向EcoTrends项目贡献数据，其中包含全部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、美国农业部林业局、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。该门户依托交互式网页应用，支持用户持续开展数据汇编与数据访问工作。作为长期生态研究网溯源感知综合跟踪架构（PASTA, Provenance Aware Synthesis Tracking Architecture）的组成部分，其正在推进的数据汇编工作通过手动与自动两种处理方式进行更新。该网络门户由约纳LTER站点与LTER网络办公室合作开发。
以下来自雪松溪生态系统科学保护区（CDR, Cedar Creek Ecosystem Science Reserve）的数据集，包含以百分比为单位的细画眉草（Eragrostis spectabilis）盖度测量数据，且已按年际时间尺度完成聚合。