Shortgrass Steppe site, station Treatment 2 (water addition) for ESA study, study of plant density of Sitanion hystrix 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 Sitanion hystrix measurements in numberPerMeterSquared units and were aggregated to a yearly timescale.

EcoTrends项目由Debra Peters博士（乔纳达盆地长期生态研究网，USDA-ARS乔纳达实验牧场）与Ariel Lugo博士（卢奎洛长期生态研究网，USDA林务局卢奎洛实验林）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。本项目属于大型综合研究计划，核心目标是提升长期生态数据的可获取性与应用效能。目前共有约50个州级与联邦资助的科研站点参与并向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（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）资助的站点与众多高校科研站点。EcoTrends项目的数据可通过探索型网络门户（http://www.ecotrends.info）获取。该门户依托交互式Web应用，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，其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。本网络门户由乔纳达LTER与LTER网络办公室联合开发。以下为来自短草草原（Shortgrass Steppe, SGS）的数据集，该数据集包含以每平方米数量为单位的Sitanion hystrix植物密度测量数据，且已聚合至年度时间尺度。