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

EcoTrends项目由黛布拉·彼得斯博士（约拿盆地长期生态研究网，隶属于美国农业部农业研究局[USDA-ARS]约拿实验牧场）与阿里尔·卢戈博士（卢奎略长期生态研究网，隶属于美国农业部林务局[USDA-FS]卢奎略实验森林）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。该项目是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应用效能。目前共有约50个由州政府及联邦资助的研究站点参与EcoTrends项目并贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research，缩写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）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Web应用程序，为用户提供持续的数据汇编与数据获取服务。持续开展的数据汇编工作通过人工与自动处理相结合的方式进行更新，该流程依托长期生态研究网溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture，缩写PASTA）实现。本网络门户由约拿LTER站点与LTER网络办公室联合开发运营。本次提供的圣丽塔实验牧场（SRE）数据集，包含以每平方米数量为单位的垂穗格兰马草（Bouteloua curtipendula）植株密度测量数据，且已按年度时间尺度完成聚合。