Forest-wide bird survey at 183 sample sites the Andrews Experimental Forest from 2009-2019 (Reformatted to a Darwin Core Archive)

This data package is formatted as a Darwin Core Archive (DwC-A, event
core). For more information on Darwin Core see
https://www.tdwg.org/standards/dwc/. This Level 2 data package was
derived from the Level 1 data package found here: https://pasta.lternet.edu/package/metadata/eml/edi/359/2,
which was derived from the Level 0 data package found here:
https://pasta.lternet.edu/package/metadata/eml/knb-lter-and/4781/3. The abstract below was extracted from the Level 0 data
package and is included for context: Bird occurrence data collected at 183 sample locations within the H. J. Andrews Experimental Forest (HJA) from 2009-present. We used a stratified, systematic, random design to select sample locations. We stratified across elevation, distance to road, and habitat type (plantation or mature/old-growth forest). We conduct point counts on six separate occasions from May – July, which corresponded to spring arrival and subsequent breeding period for the majority of bird species at HJA. Surveys occur between 05:15h and 10:30h and each consists of a 10-min point count where we record all birds seen or heard. The species of all birds seen and heard are recorded as well as all individual squirrels, chipmunks and pikas seen and heard. Survey-level information is also collected at each point count and includes: weather and wind conditions, stream noise, snow cover on the ground, phenology of vine maple and rhododendron. Data collection is ongoing. The H.J. Andrews Experimental Forest is a living laboratory that provides unparalleled opportunities for the study of forest and stream ecosystems in the central Cascade Range of Oregon. Since 1980, as a part of the National Science Foundation Long Term Ecological Research (NSF-LTER) program, the Andrews Experimental Forest has become a leader in the analysis of forest and stream ecosystem dynamics. Long-term field experiments and measurement programs have focused on climate dynamics, streamflow, water quality, and vegetation succession. Currently researchers are working to develop concepts and tools needed to predict effects of natural disturbance, land use, and climate change on ecosystem structure, function, and species composition. The Andrews Experimental Forest is administered cooperatively by the USDA Forest Service Pacific Northwest Research Station, Oregon State University and the Willamette National Forest. Funding for the research program comes from the National Science Foundation (NSF), US Forest Service Pacific Northwest Research Station, Oregon State University, and other sources.

本数据包采用达尔文核心归档（Darwin Core Archive, DwC-A，事件核心）格式。有关达尔文核心标准的详细信息，请参阅：https://www.tdwg.org/standards/dwc/。本二级数据包源自下述链接的一级数据包：https://pasta.lternet.edu/package/metadata/eml/edi/359/2，而该一级数据包又源自下述链接的零级数据包：https://pasta.lternet.edu/package/metadata/eml/knb-lter-and/4781/3。以下摘取自零级数据包，旨在提供背景信息：

本数据集采集了2009年至今于H·J·安德鲁斯实验林（HJA）内183个采样点的鸟类出现记录。研究采用分层系统随机抽样设计选取采样点位，分层依据包括海拔、距道路距离以及生境类型（人工林或成熟/原始森林）。调查于每年5月至7月分六次开展，该时段对应HJA地区多数鸟类的春季迁徙抵达及后续繁殖期。野外调查于每日05:15至10:30之间进行，每次调查包含10分钟的点计数过程，记录所有可见或可闻的鸟类个体。研究人员不仅记录所有鸟类的物种信息，同时记录所有可见或可闻的松鼠、花鼠及鼠兔的物种与个体数量。每次点计数调查还会采集调查层面的环境信息，包括天气与风力状况、溪流噪音、地面积雪覆盖情况，以及团扇槭（vine maple）和杜鹃花属（rhododendron）的物候期。数据采集工作目前仍在持续进行。

H·J·安德鲁斯实验林是一座活体实验室，为俄勒冈州中部喀斯喀特山脉的森林与溪流生态系统研究提供了得天独厚的条件。自1980年起，作为美国国家科学基金会长期生态研究（National Science Foundation Long Term Ecological Research, NSF-LTER）计划的组成部分，安德鲁斯实验林已成为森林与溪流生态系统动态分析领域的领军研究平台。

长期野外实验与监测项目聚焦于气候动态、径流、水质及植被演替。当前研究人员正致力于开发相关概念与工具，以预测自然干扰、土地利用及气候变化对生态系统结构、功能与物种组成的影响。

安德鲁斯实验林由美国农业部林务局太平洋西北研究站、俄勒冈州立大学及威拉米特国家森林共同管理。本研究项目的资金来源于美国国家科学基金会（NSF）、美国林务局太平洋西北研究站、俄勒冈州立大学及其他资助方。