Shortgrass Steppe site, station Treatment 4 (water and nitrogen addition) for ESA study, study of plant density of Sphaeralcea coccinea 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 Sphaeralcea coccinea measurements in numberPerMeterSquared units
and were aggregated to a yearly timescale.

生态趋势（EcoTrends）项目由黛布拉·彼得斯博士（霍纳达盆地长期生态研究站点，美国农业部农业研究服务局霍纳达实验牧场）与阿里尔·卢戈博士（卢基略长期生态研究站点，美国农业部林务局卢基略实验林）于2004年发起创立，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计划，旨在提升长期生态数据的可获取性与应用效能。目前，已有约50个州级与联邦资助的研究站点参与并为生态趋势（EcoTrends）项目贡献数据资源，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 Agriculture Research Service，ARS）、美国农业部林务局、美国能源部、美国地质调查局（US Geological Survey，USGS）与众多高校资助的研究站点。生态趋势（EcoTrends）项目的数据集可通过探索性网络门户（http://www.ecotrends.info）获取。该网络门户依托交互式Web应用程序，支持用户持续开展数据汇编工作并便捷获取数据资源。作为长期生态研究溯源感知综合跟踪架构（LTER Provenance Aware Synthesis Tracking Architecture，PASTA）的组成部分，持续推进的数据汇编工作通过人工与自动处理相结合的方式完成更新。该网络门户由霍纳达LTER站点与LTER网络办公室联合共建。下述来自短草草原（Shortgrass Steppe，SGS）的数据集包含猩红锦葵（Sphaeralcea coccinea）的植株密度数据，测量单位为每平方米数量，且已按年际时间尺度进行聚合。