Walnut Gulch Experimental Watershed site, station NADP Station AZ98, Chiricahua, AZ, study of nitrate 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 Walnut Gulch Experimental Watershed (WGE)
contains nitrate in precipitation (volume-weighted concentration) measurements in milligramsPerLiter units
and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（乔纳达盆地长期生态研究（Long-Term Ecological Research, LTER）站点，美国农业部-农业研究服务局乔纳达实验牧场）与阿里尔·卢戈博士（卢奎略长期生态研究（Long-Term Ecological Research, LTER）站点，美国农业部-林务局卢奎略实验森林）于2004年创立，旨在支持长期生态数据集的采集与分析。该项目为大型综合研究工作，核心聚焦于提升长期数据的可获取性与应用效率。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，其中涵盖全部26个长期生态研究站点，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（US Geological Survey, USGS）及众多高校资助的站点。EcoTrends项目的数据集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Web应用程序，支持用户持续开展数据汇编与数据获取工作。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，持续的数据汇编工作通过手动与自动两种处理方式完成更新。该网络门户由乔纳达LTER站点与LTER网络办公室联合开发。本次提供的核桃谷实验流域（Walnut Gulch Experimental Watershed, WGE）数据集包含降水硝酸盐（体积加权浓度）测量数据，单位为毫克每升，且已聚合至年度时间尺度。