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Research Highlights
Lookout Fire 2023

On the west slopes of the Cascades, forest development is shaped by extensive stand-replacing (SR) fires and more frequent fires that cause predominantly non-stand replacing (NSR) effects. These NSR…

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Spotted Owl perched in tree

Northern spotted owl populations are approaching or have already crossed functional extinction across large areas of the Pacific Northwest. Researchers used artificial intelligence and advanced…

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HJ Andrews Experimental Forest research plot

In a recent essay in Nature, former Lead PI of the LTER program, Michael Paul Nelson, draws on lessons long familiar in the humanities. Nelson argues that we should shift our priorities toward…

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Canopy Ecology Field Work 2021

In late June 2021, multiple days of record-breaking heat caused an unprecedented amount of foliage death in the forests of the Pacific Northwest. Portions of tree canopies with healthy green foliage…

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Pacific Northwest Permanent Sample Plot Program, Field work 2018

Forest succession theory predicts long-term dynamics of tree species and ecosystem biomass through time, with shifts from early- to late seral species and cessation of live biomass accumulation being…

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News & Events
News

Beginning with an ascent of a 200-foot-tall Douglas-fir with a bird biologist, author Marina Richie leads us from her home in Central Oregon into the ancient forests of Cascadia. Marina collaborated...

News

The U.S. Forest Service Pacific Northwest Research Station, in partnership with the American Conservation Experience, is seeking qualified applicants for a Hydrological Research Support Member...

News

“ The Lookout Fire altered a forest completely, but it didn’t change the H.J. Andrews Experimental Forest’s mission” https://www.klcc.org/science-technology/2026-06-04/the-lookout-fire-alt…...

Event

Andrews Forest Monthly Meeting: Friday, April 3, 9-11 AM Presentations: “HJA’s high elevation meadow complexes: hyper-diverse plant-pollinator interactions” presented by Lauren Ponisio, Associate...

Fast Facts
15,800
total acres in the drainage basin of Lookout Creek
2.2
seconds, Lookout Creek's average water discharge is equivalent to one concrete truck every 2.2 seconds
1000
years before a western red cedar log will have decomposed
30
gigabases, genome size
14
feet, largest snowpack recorded at the Andrews Forest
4251
flower visits
1600
macrofungi
70
percent of the HJA burned since 2020
5,340
feet, maximum elevation in the forest
7
feet, average annual rainfall
61
meters up in a tree, a clouded salamander
40%
old-growth trees covering total areas
Recent Publications

Ratz, A.W.; Arnold, A. E.; Burrill, H.M.; Caiafa, M.V.; Conery, J.; Dawson, H.A.; Delevich, Ca.A.; Diez, J.M.; Frey, S.D.; Lodge, D. J.; Ronold, E.K.; Roy, B.A.; Smith, M.E.; U'Ren, J.; Wilson, A.W.; Loucks, J.J.; Wuest, J.; Willis, C. B.; Kennedy, P.G. 2026. Sporecasting Biogeography Across Scales: Continental Patterns and Local Constraints on Macrofungal Dispersal. Molecular Ecology. 35(9): e70366. doi:https://doi.org/10.1111/mec.70366

Andrews Forest
Blue River, OR
 
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