Donald Hagan

Assistant Professor of Forest Ecology
Forestry and Environmental Conservation Department

Office: 202 Lehotsky Hall
Phone: 864-656-7333


 Educational Background

Ph.D. Forest Ecology
University of Florida 2012

M.S. Forest Ecology
University of Florida 2008

B.S. Environmental Studies/Policy
University of West Florida 2002

 Courses Taught

FOR2050/2051 Dendrology
FOR2060/2061 Forest Ecology
FOR2510 Forest Communities
FNR4700 Vegetative Succession in Restored Wetland and Stream Ecosystems (Creative Inquiry)
FNR4700 Japanese Stiltgrass Invasion in a Multi-Use Forest: Patterns, Mechanisms and Perceptions (Creative Inquiry)
FNR4700 Appalachian Fire Ecology (Creative Inquiry)
FOR4930 Wildland and Prescribed Fire Training
FOR4930 Winter Tree ID
FOR8050 Forest Landscape Ecosystems


Dr. Hagan is an ecologist who studies the effects of fire and plant invasions on population, community and ecosystem-level processes in forest ecosystems. He conducts most of his research in the southern Appalachian and Piedmont regions, but he has also worked extensively in the SE Coastal Plain, Florida, and in the tropical dry forests of coastal Ecuador. Current research projects are supported by the Joint Fire Science Program, the US Forest Service, the National Park Service, and the USDA Conservation Innovation Grant program. Hagan is passionate about teaching and mentoring and is heavily involved with Clemson's Creative Inquiry undergraduate research program. He serves as faculty advisor for the Forestry Club and the student chapter of the Society of American Foresters, and works closely with the "Fire Tigers" -- Clemson's wildland and prescribed fire crew. Since 2015 he has served on the board of the Consortium of Appalachian Fire Managers and Scientists.

Dr. Hagan was the recipient of the Society of American Foresters Young Forester Leadership Award (2017), the Ansel E. Miller Faculty Teaching Award (2017 and 2015) and the CAFLS Teaching Award of Excellence (2014).

 Research Interests

Forest ecology, invasion ecology, fire ecology, forest soils



Hagan D.L., Malone R.H., and Strickland C.R. (pre-publication contract, to be published Fall 2018). Winter Tree ID for the Southern Appalachians and Piedmont: A Photographic Guide. Clemson University Press.


Greenberg C.H., Moorman C.E., Matthews-Snoberger C.E., Waldrop T.A., Simon D., Heh A. and Hagan D. (2017). Long-term herpetofaunal response to repeated fuel reduction treatments. The Journal of Wildlife Management.

Coates T.A., Chow A.T., Hagan D.L., Wang G.G., Bridges W.C. and Dozier J.H. (2017). Frequent prescribed burning as a long-term practice in longleaf pine forests does not affect detrital chemical composition. Journal of Environmental Quality (in press).

Daniels K., Hagan D.L. and Jachowski D.S. (2017). Habitat fragmentation, low seed germination rates, and herbivory impede conservation efforts for a prairie relict wildflower. Journal of the Torrey Botanical Society (in press)

Weaver N.S., Barrett R.K. and Hagan D.L. (2017). The influence of exurban landscapes and local site characteristics on riparian vegetation. Urban Ecosystems.

Mikhailova E., Hagan D., Sharp J., Allerton T., Burdette K., Mealing V., Ritter B., Solomons A., Stiglitz R.,and M. Schlautman. (2017). Landscape, soil and plant analysis of Japanese stiltgrass (Microstegium vimineum) invasion around Lake Issaqueena, SC. Communications in Soil Science and Plant Analysis.

Waldrop, T.A., Hagan, D.L., and Simon, D. (2016). Repeated application of fuel reduction techniques in the southern Appalachian mountains, USA. Implications for achieving management goals. Fire Ecology 12(2): 28-47.

Mikhailova, E., Hagan, D., Sharp, J., Allerton, T., Burdette, K., Mealing, V., Ritter, B., Solomons, A., and R. Stiglitz. (2016). Geospatial soil and plant tissue analysis of Sericea Lespedeza (Lespedeza cuneata) invasion around Lake Issaqueena, SC. Communications in Soil Science and Plant Analysis 47(5): 630-638.

Hagan D.L., Waldrop T.A., Reilly M. and Shearman T. (2015). Impacts of repeated wildfire on long-unburned Southern Appalachian plant communities. International Journal of Wildland Fire 24: 911-920.

Stricker K.B., Hagan D.L. and Flory S.L. (2015). INVITED REVIEW: Improving methods to evaluate the impacts of plant invasions: Lessons from 40 years of research. AoB Plants 7:1-10.

Hagan D.L., Mikhailova E.A., Shearman T.M., Ma P.T., Nankaya J.S., Hart S.K., Valdetero H.E., Bridges W.C. and Yun H. (2014). The role of soil and landscape factors in Chinese privet (Ligustrum sinense) invasion in the Appalachian Piedmont. Invasive Plant Science and Management 7(4):483-490.

Hagan D.L. and Jose S. Mycorrhizae and alien plants. (2013). In: Jose S. (Ed). Invasive Plant Ecology. CRC Press/Taylor and Francis.

Hagan D.L., Jose S., Bohn K., and Escobedo F. (2013). Cogongrass (Imperata cylindrica) invasion and eradication: implications for soil nutrient dynamics in a longleaf pine sandhill ecosystem. Invasive Plant Science and Management 6(3):433-443.

Hagan D.L., Jose S. and Lin C. (2013). Allelopathic exudates of cogongrass (Imperata cylindrica): implications for the performance of native pine savanna species in the southeastern US. Journal of Chemical Ecology 39(2):312-322.

Hagan D.L., Dobbs C., Timilsina N., Escobedo F., Toor G. and Andreu M. (2012). Anthropogenic effects on the physical and chemical properties of subtropical coastal urban soils. Soil Use and Management 28(1):78-88.

Hagan D.L. and Jose S. (2011). Interspecific competition enhances nitrogen fixation in an actinorhizal shrub. Plant Ecology 212(1):63-68.

Shields J., Jose S., Freeman J., Bunyan M., Celis G., Hagan D.L., Morgan M. and Zak J. (2011). Short-term impacts of laurel wilt on redbay (Persea borbonia (L.) Spreng.) mortality and stand-level forest measures in a mixed evergreen-deciduous forest in northern Florida. Journal of Forestry 109(2):82-88.

Hagan D.L., Jose S., Thetford M. and Bohn K. (2010). Partitioning of applied 15N fertilizer in a longleaf pine-native woody ornamental intercropping system. Agroforestry Systems 79(1):47-57.

Hagan D.L., Jose S., Thetford M. and Bohn K. (2009). Production physiology of three native shrubs intercropped in a young longleaf pine plantation. Agroforestry Syst. 76(2):283-294. Also published in: Jose S. (Ed.) 2009. Agroforestry for Commodity Production: Ecological and Social Dimensions. Springer.


Hagan, D.L. (2016). Could agroforestry be an option for your land? Forest Landowner 73(3): 32-37.

Hagan, D. (2015). Invasive plants? Out-of-control vines? Crazy kudzu? Time to bring in the goats. Forest Landowner 72(6) 13-19.


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