Photo Gallery
The images in our galleries reflect the history, place, people, and research of the HJ Andrews Experimental Forest Long-Term Ecological Research Program. Images may be downloaded for use in papers, posters, presentations, etc. Please use the suggested acknowledgements. In some cases, higher resolution images may be available from the database manager.
Western hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) is a small, parasitic plant that infects the leaves and branches of its host plant, the western hemlock (Tsuga heterophylla) tree. Within a forest, like the HJ Andrews Experimental Forest, areas of...
The HJ Andrews Experimental Forest Long-Term Ecological Research site contains stands of old-growth forest that are aged at 300 years and older. This gallery of images, taken in 2005 by photographer Tom Iraci with the USFS, features various old-growth forest stands within the research forest. ...
HJA Day is the annual field tour of the HJ Andrews Experimental Forest Long-Term Ecological Research site. Field trips and presentations highlight the research, education, and arts and humanities work of the Andrews Forest program.
Heavy snow fell on the Andrews Forest the night of February 24, 2019. The snow, dense and wet, fell fast and accumulated quickly in the crowns of the trees. The weight of the snow toppled trees or snapped out their crowns. The entire region, including the research forest, experienced a massive...
The Andrews Forest Long-Term Ecological Research program includes a long-term soil study. Researchers dig soil pits to measure, weigh, sample, and describe the soil, across multiple locations in the forest and over many years. This photo gallery is a snapshot of the soil sampling field work in...
The terrestrial food web dynamics research project focuses on how mammalian carnivores of the Pacific Northwest forest interact with other components of the ecosystem. Specifically, the project aims to understand the ecology of the western spotted skunk: what it eats, where it lives, and how it...
The Pacific Northwest Permanent Sample Plot Program is a long-term study of forest vegetation across the Pacific Northwest. The program samples 135 plots across a diversity of forest types in Oregon and Washington. Many of the...
The Long-term Ecological Reflections program creates ongoing occasions for reflection and creative expression, and to collect a record of the resulting works that extends over two hundred years, 2003...
Oregon State University hosted an NSF-funded program for undergraduate students to conduct research in pollination biology in natural and manipulated ecosystems, beginning summer 2009. Students conducted individual research projects comparing native bee pollinator diversity and dynamic...
Photographs of plants and their pollinators. Images were taken in the high meadows of the Andrews Forest in summer 2018 during the Research Experience for Undergraduates pollinator research project field work. This gallery is a subset of the...
HJA Day is the annual field day at the HJ Andrews Experimental Forest and Long-Term Ecological Research site. HJA Day 2018 happened on June 28, 2018. The event highlighted the 70th anniversary of the 1948 establishment of the HJ Andrews Experimental Forest.
Starting in 2017, blogger and photographer Erika Zambello launched a road trip to visit as many LTER sites as possible. Erika visited the Andrews Forest LTER site in May 2018. Erika went high into the canopy of a big Douglas fir tree. She visited climate stations and hydrology gage stations that...
Graduate student Karla Jarecke studied how water moves through soil on the steep slopes of Watershed 1 at the Andrews Forest. Karla and an NSF-funded Research Experience for Undergraduate (REU) student, Lauren Roof, dug soil pits to sample and describe soil, and used metal rods to measure soil...
The National Science Foundation (NSF) funds research at the HJ Andrews Experimental Forest through its Long-Term Ecological Research (LTER) grant funding. The Andrews Forest has been funded by the NSF LTER program since 1980. LTER grants are six years in duration. Midway through the grant cycle...
Images from HJA Day, our annual field day and open house, from years 2015 and 2016. See more about HJA Day on our Events and Meetings page.
Stream ecology research on fish and salamanders, including the SCALER project, the Fish-No Fish project, and the long-term Mack Creek Fish and Salamander Survey. Meadow field work including pollinators and the EISI program. Soil moisture measurements in WS1.
Phenology is the study of the timing of natural phenomena, especially in relation to climate. At the Andrews Forest, scientists have been studying the timing of bud break and flowering of plants, and relating that timing, across years, to the ongoing, long-term climate records at the site.
The H.J. Andrews Experimental Forest had record snow levels in April 2008.
The historical images in this gallery were pulled together for the historical publication by Max Geier (2007) "Necessary work: discovering old forests, new outlooks, and...