Santa Rita Experimental Range site, station Pasture 21 at Santa Rita Experimental Range, study of plant density of Solanum elaeagnifolium 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 of Solanum elaeagnifolium measurements in numberPerMeterSquared units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（霍纳达盆地长期生态研究（Long-Term Ecological Research, LTER），美国农业部农业研究服务局（USDA-ARS）霍纳达实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究（LTER），美国农业部林务局（USDA-FS）卢奎洛实验林）于2004年创立，旨在支撑长期生态数据集的收集与分析工作。该项目属于大型综合研究项目，核心聚焦于提升长期生态数据的可获取性与应用价值。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，其中包含全部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）、美国农业部林务局、美国能源部、美国地质调查局（USGS）及众多高校资助的相关站点。EcoTrends项目的数据可通过探索性Web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共享工作。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模式完成更新。该Web门户由霍纳达LTER与LTER网络办公室联合开发运维。以下来自圣丽塔实验牧场（Santa Rita Experimental Range, SRE）的数据集，包含银叶茄（Solanum elaeagnifolium）的植株密度数据，单位为每平方米数量（numberPerMeterSquared），且已按年时间尺度完成聚合。