Luquillo Experimental Forest site, station Mayaguez County, PR (FIPS 72097), study of human population density in units of numberPerKilometerSquared 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 Luquillo Experimental Forest (LUQ) contains human population density measurements in numberPerKilometerSquared units and were aggregated to a yearly timescale.

EcoTrends项目由黛布拉·彼得斯博士（约纳达盆地长期生态研究站，USDA-ARS约纳达试验牧场）与阿里尔·卢戈博士（卢奎约长期生态研究站，USDA-FS卢奎约试验林）于2004年创立，旨在支持长期生态数据集的采集与分析。本项目是一项大型综合研究工作，致力于提升长期数据的可获取性与应用价值。目前已有约50个由州政府及联邦政府资助的研究站点参与并贡献数据至EcoTrends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服务局（ARS）、美国农业部林务局、美国能源部、美国地质调查局（USGS）及众多高校资助的研究站点。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Web应用程序，实现数据的持续整合，并向用户开放数据获取渠道。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，持续进行的数据整合工作将通过人工与自动两种处理方式完成更新。该网络门户由约纳达LTER站与LTER网络办公室联合开发运营。以下来自卢奎约试验林（Luquillo Experimental Forest, LUQ）的数据集，包含以每平方千米人数为单位的人口密度测量数据，且已按年度时间尺度进行聚合。