Cedar Creek Ecosystem Science Reserve site, station NADP Station MN01, Cedar Creek, MN, study of sulfate 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 Cedar Creek Ecosystem Science Reserve (CDR) contains sulfate in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units and were aggregated to a yearly timescale.

生态趋势项目（EcoTrends）由黛布拉·彼得斯博士（约拿盆地长期生态研究站，美国农业部农业研究局约拿实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站，美国农业部林业局卢奎洛实验森林）于2004年创立，旨在支撑长期生态数据集的收集与分析工作。该项目为大型综合研究计划，核心目标是提升长期数据的可获取性与应用价值。目前共有约50个州级与联邦资助的研究站点参与并贡献数据至生态趋势项目，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（USDA Agriculture Research Service, ARS）、美国农业部林业局（USDA Forest Service）、美国能源部、美国地质调查局（US Geological Survey, USGS）及众多高校资助的站点。生态趋势项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取。该门户依托交互式网络应用程序，支持用户持续开展数据整合与获取操作。作为长期生态研究溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，正在推进的数据整合工作通过人工与自动处理两种方式同步更新。该网络门户由约拿LTER站与LTER网络办公室联合开发运营。本数据集取自雪松溪生态科学保护区（Cedar Creek Ecosystem Science Reserve, CDR），包含以毫克每升为单位的降水硫酸盐（体积加权浓度）测量值，并已按年度时间尺度完成聚合。