Shortgrass Steppe site, station Treatment 1 (control) for ESA study, study of plant density of Ratibida columnifera in units of numberPerMeterSquared 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 Shortgrass Steppe (SGS)
contains plant density of Ratibida columnifera measurements in numberPerMeterSquared units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（乔纳达盆地长期生态研究站，USDA-ARS乔纳达实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站，USDA-FS卢奎洛实验森林）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。该项目为一项大型综合研究项目，核心目标在于提升长期生态数据的可访问性与应用价值。目前共有约50个由州政府及联邦政府资助的研究站点参与并向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（ARS）、美国农业部林务局、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。作为长期生态研究站溯源感知综合跟踪架构（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。该网络门户由乔纳达LTER站点与LTER网络办公室联合开发。本次提供的短草草原（Shortgrass Steppe, SGS）数据集包含草原松果菊（Ratibida columnifera）的植株密度数据，单位为每平方米株数，且已按年度时间尺度完成聚合。