Santa Rita Experimental Range site, station Pasture 8 at Santa Rita Experimental Range, study of plant density 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 Santa Rita Experimental Range (SRE)
contains plant density measurements in numberPerMeterSquared units
and were aggregated to a yearly timescale.

EcoTrends项目由Debra Peters博士（霍洛塔盆地长期生态研究（Long-Term Ecological Research, LTER）站点，美国农业部农业研究局（USDA-ARS）霍洛塔试验牧场）与Ariel Lugo博士（卢基略长期生态研究（LTER）站点，美国农业部林务局（USDA-FS）卢基略试验林）于2004年创立，旨在支持长期生态数据集的收集与分析工作。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获取性与利用率。目前共有约50个州级及联邦资助的研究站点参与并为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Web应用程序，支持用户持续开展数据汇编与数据获取工作。作为溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，持续进行的数据汇编工作通过人工与自动两种处理方式进行更新。该网络门户是霍洛塔LTER与LTER网络办公室的合作成果。本次来自圣丽塔试验牧场（Santa Rita Experimental Range, SRE）的数据集包含以每平方米株数为单位的植物密度测量数据，且已被聚合至年度时间尺度。