Sevilleta site, station Deep Well, study of plant cover of Aristida purpurea var. purpurea (purple threeawn) 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 Sevilleta (SEV) contains plant cover of Aristida purpurea var. purpurea (purple threeawn) measurements in percent units and were aggregated to a yearly timescale.EcoTrends项目由Debra Peters博士（约拿盆地长期生态研究（Long-Term Ecological Research, LTER）站点、美国农业部-农业研究服务局约拿实验牧场）与Ariel Lugo博士（卢奎洛长期生态研究（Long-Term Ecological Research, LTER）站点、美国农业部林业局卢奎洛实验森林）于2004年发起成立，旨在支持长期生态数据集的采集与分析工作。 本项目为一项大型综合研究工作，核心目标是提升长期生态数据的可获取性与利用水平。目前共有约50个由州政府及联邦政府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（LTER）站点，以及由美国农业部农业研究服务局（ARS）、美国农业部林业局、美国能源部、美国地质调查局（USGS）与众多高校资助的站点。 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络应用程序，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，持续推进的数据汇编工作通过手动与自动两种处理方式完成更新。 本网络门户为约拿LTER与LTER网络办公室的合作成果。 本次来自塞维列塔（SEV）的数据集包含以百分比为单位的紫芒草（Aristida purpurea var. purpurea，purple threeawn）盖度测量数据，且已按年尺度进行聚合。