Blacks Mountain Experimental Forest site, station California Division 3, Northeast Interior Basins, study of Palmer Drought Severity Index in units of dimensionless 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 Blacks Mountain Experimental Forest (BLA)
contains Palmer Drought Severity Index measurements in dimensionless 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站，Jornada Basin LTER；美国农业部农业研究服务局乔纳达实验牧场，USDA-ARS Jornada Experimental Range）与阿里尔·卢戈博士（卢奎洛长期生态研究站，Luquillo LTER；美国农业部森林服务局卢奎洛实验森林，USDA-FS Luquillo Experimental Forest）于2004年创立，旨在支撑长期生态数据集的采集与分析工作。本项目为大型综合研究计划，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，已有约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服务局（USDA Agricultural Research Service, ARS）、美国农业部森林服务局、美国能源部、美国地质调查局（US Geological Survey, USGS）及多所高校资助的站点。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LTER溯源感知综合跟踪架构（Provenance Aware Synthesis Tracking Architecture, PASTA）的组成部分，常态化的数据汇编工作通过手动与自动两种处理方式完成更新。本网络门户由乔纳达LTER站与LTER网络办公室合作搭建。以下来自布莱克山实验森林（Blacks Mountain Experimental Forest, BLA）的数据集，包含以无量纲为单位的帕默尔干旱严重程度指数（Palmer Drought Severity Index）测量值，且已聚合至年时间尺度。