Priest River Experimental Forest site, station NADP Station ID02, Priest River Experimental Forest, ID, study of ammonium in precipitation (volume-weighted concentration) in units of milligramsPerLiter 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 Priest River Experimental Forest (PRI)
contains ammonium in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units
and were aggregated to a yearly timescale.

EcoTrends项目由Debra Peters博士（乔达纳盆地长期生态研究站点（Long-Term Ecological Research, LTER），美国农业部农业研究局（Agricultural Research Service, ARS）乔达纳实验牧场）与Ariel Lugo博士（卢奎略长期生态研究站点（Long-Term Ecological Research, LTER），美国农业部林业局卢奎略实验森林）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计划，核心目标为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为EcoTrends项目贡献数据，其中包括全部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（Agricultural Research Service, ARS）、美国农业部林业局、美国能源部、美国地质调查局（US Geological Survey, USGS）与众多高校资助的科研站点。EcoTrends项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取。该网络门户依托交互式网络应用程序，为用户持续提供数据汇编与数据获取服务。作为长期生态研究站点溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，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。该网络门户由乔达纳LTER与LTER网络办公室联合开发。以下来自普里斯特河实验森林（Priest River Experimental Forest, PRI）的数据集，包含降水中铵态氮的体积加权浓度测量数据，单位为毫克每升，且已按年度时间尺度进行聚合。