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Lisa Floyd-Hanna, Ph.D

Faculty Emeritus

Lisa Floyd-Hanna, Ph.D
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220 Grove Ave
Prescott, AZ 86303

Lisa Floyd-Hanna is a plant ecologist whose research focuses on fire history and fire effects in piñon-juniper and other arid southwestern ecosystems.  She also studies the effects of disturbances such as climate-driven insect infestation on plant communities and threatened plant populations.  Lisa is involved in many National Park Service and Forest Service projects.  Her courses include Basic Biology, Botany, and Statistics for Research.  Field Methods for Plant Ecology takes place in Kino Bay and focuses on Sonoran desert ecology as well as field sampling and GIS techniques.  Field Biology Studies: Colorado Plateau allows students the opportunity to be involved in on-going research in Dinosaur National Monument, Mesa Verde National Park, and other locations.  Advanced courses include Fire Ecology and Anatomy and Physiology of Plants.



Ph.D., University of Colorado, Environmental, Population, Organismic Biology, 1981; M.S. University of Hawaii, Botany, 1977; B.S., University of Hawaii, 1974.



Lisa Floyd-Hanna and her collaborators explore issues of pinon-juniper woodland  health, including heterogenous fire histories, ecosystem relileincy to perturbations and responses to climate driven changes such as beetle infestations.  She is currently studying post-fire succession in Mesa Verde National Park, fire history of Dinosaur National Monument, and effects of nitrogen deposition in Four Corners National Parks. 



Fire history in southwestern pinon-juniper woodlands,  post-fire succession, fire-related weed invasions, nitrogen deposition effects in arid woodlands.



Floyd, M. Lisa, and William H. Romme. 2012. Ecological Restoration Priorities and Opportunities in Piñon-Juniper Woodlands. Ecological Restoration 30 (1):37-49

Floyd, M. Lisa, William H. Romme, Monique E. Rocca, Dustin P. Hanna, and David D. Hanna. 2015. Structural and regenerative changes in old-growth piñon–juniper woodlands following drought-induced mortality. Forest Ecology and Management 341: 18-29.

Floyd, M. Lisa, David D. Hanna, Thomas L. Fleischner and Brad Shattuck. 2012  Revisiting Trends in Vegetation Recovery Following Protection from Grazing, Chaco Culture National Park, New Mexico. pp 83--92 In: The Colorado Plateau V: Research, environmental planning, and management for collaborative conservation.  (van Riper, C., III, M. L. Villarreal, C. J. van Riper, and M. J. Johnson, Eds).  University of Arizona Press, Tucson, AZ. 343 pp. 

Cho-ying Huang , Gregory P. Asner , Nichole N. Barger , Jason C. Neff , M. Lisa Floyd.2010.Regional aboveground live carbon losses due to drought-induced tree diebackin piñon–juniper ecosystems. Remote Sensing of Environment 114 (2010) 1471–1479.

Thomas, K. M. McTeague, L. Ogden, M.L. Floyd and others. 2009. Vegetation Classification and Mapping Report;Mesa Verde National Park. Natural Resource Technical Report NPS/SCPN/NRTR-2009/112. National Park Service, Fort Collins, Colorado.

Salas, D. D. Wgner, L. Floyd-Hanna. 2009.Vegetation Classification and Mapping Report; Aztec Ruins National Monument. Natural Resource Technical Report NPS/SCPN/NRTR-2009/244. National Park Service, Fort Collins, Colorado.

Romme, William H., M. Lisa Floyd, and David Hanna. 2009. Historical range of variability and current landscape condition analysis: South-central highlands section, southwestern Colorado and northwestern New Mexico. Colorado Forest Restoration Institute Publ., Ft. Collins, Colorado.

William H. Romme, Craig D. Allen, John D. Bailey,3William L. Baker, Brandon T. Bestelmeyer,Peter M. Brown, Karen S. Eisenhart, M. Lisa Floyd, David W. Huffman,9Brian F. Jacobs,Richard F. Miller, Esteban H. Muldavin, Thomas W. Swetnam,Robin J. Tausch, and Peter J. Weisberg. 2009. Historical and Modern Disturbance Regimes, Stand Structures, and Landscape Dynamics in Piñon –Juniper Vegetation of the Western United States. Rangland Ecology and Management 62:203-222.

Floyd,  M. L. M. Clifford, N. Cobb D. P.  Hanna, R. Delph,  P Ford and D Turner. 2009. Relationship of stand characteristics to drought-induced mortality in piñon-juniper woodlands in Colorado, New Mexico and Arizona. Ecological Applications 19(5):1223-1230.

Floyd, M. Lisa, William H. Romme, David D. Hanna, Mark Winterowd, Dustin Hanna, and John Spence. 2008 Fire history of Piñon-Juniper woodlands on Navajo point, Glen Canyon National Recreation Area. Natural Areas Journal 28:26-36.

Romme, W., C. Allen, J. Bailey, W. Baker, B. Bestelmeyer, P. Brown, K. Eisenhart, L. Floyd-Hanna, D. Huffman, B. Jacobs, R. Miller, E. Muldavin, T. Swetnam, R. Tausch, and P. Weisberg.  2007. Historical and Modern Disturbance Regimes of Pinon-Juniper Vegetation in the Western U.S.  Colorado Forest Restoration Institute. www.cfri.colostate.

Turner, C. , Romme, W., Chew, J., Miller, M., Leavesley,G.,  Floyd-Hanna, L., San Miguel, G., Cobb, N.,  Zirbes, R., Viger, R., and Ironside, K., (2009), "The FRAME Project--A Collaborative Modeling Approach to Natural Resource Management at Mesa Verde National Park", Colorado, in  Charles van Riper III, (ed.*), Proceedings of the 8th Biennial Conference of Research on the Colorado Plateau", 33 ms pages.

Leavesley, G., Viger, R., Chew, J., Turner, C., Zirbes, R., Romme, W., Miller, M., San Miguel, G., Cobb, N., Floyd-Hanna, L., 2006, A modular modeling approach to integrating adaptive modeling systems with resource management in the FRAME Project: Geological Society of America Abstracts with Programs, v. 38, no. 6, p. 30.

 Turner, C., San Miguel, G., Leavesley, G., Chew, J., Zirbes, R., Romme, W., Miller, M., Cobb, N., Floyd-Hanna, L., Viger, R., 2006, Project FRAME (Framing Research in support of Adaptive Management:  Geological Society of America Abstracts with Programs, v. 38, no. 6, p. 30.

Turner, C., Leavesley, G., Zirbes, R., Viger, R., San Miguel, G., Chew, J, Romme, W., Floyd-Hanna, L., Miller, M., Cobb, N., and Ironside, 2006, USGS Project FRAME
(Framing Research in support of Adaptive Management of Ecosystems):  Colorado Scientific Society Newsletter, March, p. 2-3.

Romme, W. H. P. J. Barry, D. D. Hanna, M. L. Floyd, S White, 2006. A Wildfire hazard assessment and map for LaPlata County, Colorado, USA.  Fire Ecology, 2:7-30.

Floyd, M. Lisa, David Hanna, William H. Romme  and Timothy E. Crews. 2006. Predicting and mitigating weed invasions to restore natural post-fire succession in Mesa Verde National Park, Colorado, USA. International Journal of Wildland Fire 15(2) 247–259.

Breshears, David D.  Neil S. Cobb, Paul M. Rich, Kevin P. Price, Craig D. Allen, Randy G. Balice, William H. Romme, Jude H. Kastens, M. Lisa Floyd, Jayne Belnap, Jesse J. Anderson, Orrin B. Myers, and Clifton W. Meyer. 2005.  Regional vegetation die-off in response to global-change-type droughtProceedings of the National Academy of Sciences. 102:15144-15148.

Floyd, M. Lisa, D. D. Hanna, W.H. Romme. 2004. Historical and recent fire regimes in Piñon-juniper woodlands on Mesa Verde, USA. Forest Ecology and Management.198:269-289.

Floyd, M. Lisa. 2003 ed .  Ancient Piñon-Juniper Woodlands: A Natural History of Mesa Verde Country. University Press of Colorado. Boulder, CO.

Grissino-Mayer, H., W. H. Romme, M. Lisa Floyd, and D. Hanna. 2004. Climate and human influences on fire regimes of the southern San Juan Mountains.  Ecology. 85(6): 1708-1724.

Floyd, M. Lisa, T. Fleischner, and D. Hanna, Paul Whitefield 2003. Historic grazing effects in Chaco Canyon National Historic Park.  Conservation Biology 17:1703-1711.

Romme, W. H., M. Preston, D. L. Lynch, P. Kemp, M. L. Floyd, D. D. Hanna, and S. Burns. 2003. The ponderosa pine partnership: ecology, economics, and community involvement in forest restoration. Invited chapter in: Friederici, P. (editor), Ecological restoration of southwestern ponderosa pine forests: A sourcebook for research and
application. Island Press.

Romme, W. H., M. L. Floyd, and D. D. Hanna. 2003. Ancient piñon-juniper forests of Mesa Verde: A cautionary note about thinning and burning for restoration. in Omi, P. N., and L. Joyce, Technical Editors. Fire, Fuel Treatments, and Ecological Restoration: Conference Proceedings; 2002 16-18 April, Ft. Collins, Colorado. USDA Forest Service RNRS-P-29.

Romme, W. H., L. Floyd-Hanna, D. D. Hanna, and E. Bartlett. 2001. Aspen’s ecological role in the West. Pages 243-259 in: Shepperd, W. D., D. Binkley, D. L. Bartos, T. J. Stohlgren, and L. G. Eskew (compilers), Sustaining aspen in western landscapes: symposium proceedings; 13-15 June 2000; Grand Junction, CO. USDA Forest Service, Rocky Mountain Research Station, Proceedings RMRS-P-18.

Floyd, M.L., W.H. Romme, and D. Hanna. 2000. Fire history and vegetation pattern in Mesa Verde National Park. Ecological Applications 10:1666-1680.

Lynch, D.L., W.H. Romme, and M. L. Floyd. 2000. Forest restoration in southwestern ponderosa pine. Journal of Forestry 98:17-24.

Instruction at Prescott College

Instruction at Prescott College

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