Current Research

In my current work, I am evaluating metrics to determine the effectiveness of channel restoration and am measuring the sources of carbon in the hydrologic cycle. I also am assessing alpine timberline advance by evaluating site temperature, site moisture, plant water relations, and stomatal conductance.

Research Interests

Multi-scales of hydrology, from water in individual plants to evaluation of water amount and quality in soils and stream systems; abiotic (nonliving) and biotic (living) linkages; and the role of disturbance in habitat and microsite creation.

Past Research

My past research has focused on landslide initiation, runout, and deposition in old-growth, second-growth, clearcut, and yellow cedar decline forests; effects of landslide dam-break floods on channel morphology; and effects of disturbance on tree species, throughfall, and large woody debris recruitment in channels.

Why This Research is Important

My research is working toward an understanding of whole-system water relationships, which is integral to detecting influences of both management practices and climate change on water and forest pattern. A better understanding of factors influencing water can help us to develop improved restoration techniques and to guide strategies for planning into the future.

Education

• Portland State University, Ph.D. Environmental Studies and Management 2013
• Johns Hopkins University, M.A. Environmental Engineering 1996
• University of Washington, M.S. Ecosystem Analysis 1991
• Hartwick College, B.S. Geology 1982

Featured Publications & Products

• Johnson, A.C.; Edwards, R.T.; Erhardt, R. 2007. Ground-water response to forest harvest: implications for hillslope stability.
• Gomi, Takashi; Johnson, Adelaide C.; Deal, Robert L.; Hennon, Paul E.; Orlikowska, Ewa H.; Wipfli, Mark S. 2006. Factors affecting distribution of wood, detritus, and sediment in headwater streams draining managed young-growth red alder-conifer forests in southeast Alaska.
• Wipfli, Mark S.; Deal, Robert L.; Hennon, Paul E.; Johnson, Adelaide C.; Edwards, Richard T.; De Santo, Toni L.; Gomi, Takashi; Orlikowska, Ewa H.; Bryant, Mason D.; Schultz, Mark E.; LeSage, Christian; Kimbirauskus, Ryan; D'Amore, David V. 2003. Compatible management of red alder-conifer ecosystems in southeastern Alaska..
• Haynes, Richard W.; Monserud, Robert A.; Johnson, Adelaide C. 2003. Compatible forest management: background and context..
• Monserud, Robert A.; Haynes, Richard W.; Johnson, Adelaide C. 2003. Chapter 17: the search for compatibility: what have we learned.

Publications

• Kruger, Linda E.; Johnson, Adelaide. 2017. Coastal climate change in Southeast Alaska Students aid in documenting local observations and experiences.
• Johnson, Adelaide Chapman; Yeakley, J. Alan. 2016. Seedling regeneration in the alpine treeline ecotone: Comparison of wood microsites and adjacent soil substrates.
• Buma, Brian; Johnson, Adelaide C. 2015. The role of windstorm exposure and yellow cedar decline on landslide susceptibility in southeast Alaskan temperate rainforests.
• Akagi, S. K.; Yokelson, R. J.; Burling, I. R.; Meinardi, S.; Simpson, I.; Blake, D. R.; McMeeking, G. R.; Sullivan, A.; Lee, T.; Kreidenweis, S.; Urbanski, S.; Reardon, J.; Griffith, D. W. T.; Johnson, T. J.; Weise, D. R. 2012. Measurements of reactive trace gases and variable O3 formation rates in some South Carolina biomass burning plumes Discussions.
• Dhakal, Amod; Sidle, Roy C.; Johnson, A.C.; Edwards, R.T. 2008. Reply to discussion: ground water response to forest harvest: implications or hillslope stability.
• Hennon, P.; D'Amore, D.; Wittwer, D.; Johnson, A.; Schaberg, P.; Hawley, G.; Beier, C.; Sink, S.; Juday, G. 2006. Climate warming, reduced snow, and freezing injury could explain the demise of yellow-cedar in southeast Alaska, USA.
• Johnson, Adelaide C.; Haynes, Richard W.; Monserud, Robert A., eds. 2002. Congruent management of multiple resources: proceedings from the Wood Compatibility Initiative workshop..
• Wipfli, Mark S.; Deal, Robert L.; Hennon, Paul E.; Johnson, Adelaide C.; de Santo, Toni L.; Hanley, Thomas A.; Schultz, Mark E.; Bryant, Mason D.; Edwards, Richard T.; Orlikowska, Ewa H.; Gomi, Takashi. 2002. Managing young upland forests in southeast Alaska for wood products, wildlife, aquatic resources, and fishes: problem analysis and study plan..
• Johnson, Adelaide C.; Wilcock, Peter. 1998. Effect of root strength and soil saturation on hillslope stability in forests with natural cedar decline in headwater regions of SE Alaska..