Leon Liegel

leon.liegel [at] oregonstate.edu

Research/Career Interests

- Online teaching to discuss use and management of soils to meet societal goals of diverse user groups, from individuals/families to Nation States, in temperate/tropical ecosystems; 2012 to present

- Sustainable Forestry research, extension, and outreach in the USA; 2001-2007

- National/Pacific Northwest Forest Health Monitoring (FHM) research-assessment-training; 1993-2001

- Non-timber forest products use and research in temperate/tropical forest ecosystems; 1992 to present

- Carbon sequestration and global climate change in temperate/tropical forest ecosystems; 1990-91

- Acid rain effects on stream/lake watershed soil chemistry from Maine to Georgia, USA; 1985-1990

- Plantation-natural tropical forest-soil science research in Puerto Rico/the Caribbean Basin; 1973-1985

- Island-wide natural resource inventory protocols in Puerto Rico; 1971-73

- Management of dry to wet forest ecosystems in Colombia, Costa Rica, and Honduras; April-June 1971

- USDA Soil Conservation Service woodland conservation practices in Puerto Rico; summer 1970

Selected Publications:

  1. Kerns, B.K., Liegel, L., Pilz, D., Alexander, S.J. 2002. Biological inventory and monitoring. Pgs. 237-269. In: Nontimber Forest Products in the United States. Eric T. Jones, Rebecca J. McLain, James Weigand (Eds.). University Press of Kansas, Lawrence. 424 p.
  2. Liegel, L.H. 1999. Deforestation. Pgs. 113-115. In: Alexander, D.E. and R.W. Fairgbridge (Eds.). Encyclopedia of Environmental Science. Kluwer Academic Publishers, Dordrecht. 741 p.
  3. Liegel, L.H., D. Pilz, T. Love, and E. Jones. 1998. Integrating biological, socioeconomic and managerial methods and results in the MAB Mushroom Study. AMBIO Special Report No. 9:26-33.
  4. Bailey, J.D. and L.H. Liegel. 1998. Pacific yew (Taxus brevifolia Nutt.) growth and site factors in Western Oregon. Northwest Science 72(4):283-292.
  5. Bailey, JD; Liegel, LH.  1997, Response of Pacific yew (Taxus brevifolia) to partial removal of the overstory.  Western J. Applied Forestry 12(2):41-43. 
  6. Liegel, LH. 1992. Organic carbon sequestration in the soils of Puerto Rico. Pgs. 9-32. In Beinroth, F.H. (Ed.). carbon sequestration in the soils of Puerto Rico - A case study of a tropical environment. University of Puerto Rico, Department of Agronomy and Soils, Mayaguez, PR, and the US Dep. Agric., Soil Conservation Service, World Soil Resources Division, Washington, DC. 67 p.
  7. Liegel, L; Cassell, D; Church, R; Stevens, D; and Shaffer, P.  1991. Characteristics of land use in Northeast and Southern Blue Ridge Province: Associations with acid rain effects on surface‑water chemistry.  Environmental Management 15: 269‑279. 
  8. Liegel, L.H. and D. Thompson. 1989. Poster presentations for scientific meetings. J. Agron. Educ. 18:69-75.
  9. Liegel, LH. 1986. Effects of sterilization procedures on the biological, chemical, and physical properties of soil:  A review. Turrialba 36(1): 11‑19. 
  10. Liegel, L.H., W.E. Balmer and G.W. Ryan. 1985. Honduras pine spacing trial results in Puerto Rico after 18 to 20 years. Southern Journal of Applied Forestry. 9(2):69-75.
  11. Liegel, L.H. 1984. Assessment of hurricane rain/wind damage in Pinus caribaea and Pinus oocarpa provenance trials in Puerto Rico. Commonw. For. Rev. 63:47-53.
  12. Liegel, LH.  1984. Effect of adding magnesium nitrate before dry‑ashing on phosphorus in Honduras pine foliage.  J. Agric. Univ. Puerto Rico.  68(2): 219‑221
  13. Liegel, LH.  1983. Effect of dry‑heat sterilization on chemical properties of Puerto Rican soils.  Commun. Soil Sci. Plant Anal. 14(4): 277‑286.
Curriculum Vitae: 

Profile Field Tabs

Affiliated with: 
Crop and Soil Science
Courses Taught: 

- One of several cross-campus disciplinary faculty who developed the 18-credit Sustainable Natural Resources (SNR) Graduate Certificate, 2005-2007.

- Co-developed with David Pilz the 2-credit SNR 533 course: Alternative [Nontimber] Forest Products.  Taught the course seven times from Fall 2007 to Winter 2016.

-  Primary co-developer with Drs. John L. Havlin, NC State – Raleigh and Richard J. Roseberg, Director, Southern Oregon Research and Extension Center (SOREC), Central Point, OR, to create the 3-credit course, SOIL 511 – “Soil: A Natural and Societal Resource,” 2016-2018; taught Winter 2019 and 2020 terms.  SOIL 511 purposely serves degree- and non-degree-seeking graduate learners wanting soil science knowledge but having minimal science background. Curriculum facilitates graduate degrees or certificates; continuing education units (CEUs) for licensure renewal; professional development units (PDUs) for K-12 and college science teachers; and self-improvement goals of natural resource organizational members and private individuals.

Beyond OSU