H. J. Andrews Experimental Forest site, station NADP Station OR10, H. J. Andrews Experimental Forest, OR, study of calcium in precipitation (volume-weighted concentration) in units of milligramsPerLiter on a monthly 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 H. J. Andrews Experimental Forest (AND)
contains calcium in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units
and were aggregated to a monthly timescale.

EcoTrends项目于2004年由黛布拉·彼得斯博士（乔纳达盆地长期生态研究站[Jornada Basin LTER]，美国农业部农业研究局[USDA-ARS]乔纳达实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站[Luquillo LTER]，美国农业部林务局[USDA-FS]卢奎洛实验林）创立，旨在支撑长期生态数据集的采集与分析工作。
该项目为一项大型综合研究计划，核心目标是提升长期生态数据的可访问性与应用效率。目前共有约50个由州级及联邦政府资助的研究站点参与并向EcoTrends项目贡献数据，其中涵盖全部26个长期生态研究（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）及众多高校资助的相关站点。
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访问工作。
作为LTER溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，正在进行中的数据汇编工作将通过手动与自动两种处理流程进行更新。
本网络门户由乔纳达LTER站点与LTER网络办公室合作开发。
以下来自H.J.安德鲁斯实验森林（AND）的数据集包含以毫克每升为单位的降水中钙含量（体积加权浓度）实测数据，且已按月度时间尺度进行聚合。