Interdisciplinary Life Science - PULSe Great research is a matter of choice

Timothy R. Filley

Timothy R. Filley Profile Picture

Associate Professor, Department of Earth and Atmospheric Sciences
Ph.D., Pennsylvania State University

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A central theme of my group's research is the response of terrestrial systems to landuse/landcover change (agriculture and rangeland activity), hydrologic pulses (storm events), climate change (increased atmospheric CO2) and invasive species (earthworm activity) stresses (Terrestrial Biogeochemistry). These responses are tracked within litter and below ground organic matter reservoirs as well as aquatic fractions and studied to determine the specific effects upon soil and aquatic organic matter dynamics and microbial responses. Our work involves collaborations with Native American tribal nations, Midwest regional farmers, national laboratories and numerous academic institutions. Our recent projects include:

-The impact of invasive earthworm activity on forest dynamics

-The impact of thorn woodland encroachment into grasslands in a semitropical setting on soil organic matter stabilization

-The impact of elevated CO2-induced increases in forest productivity on soil structure and SOM stabilization

-The relationship between river discharge and terrestrial organic matter sources

-The relationship between source chemistry and the stabilization of litter and soil

Additionally, we use the above biogeochemical perspective to investigate how emerging pollutants respond in the natural environment (Terrestrial Environmental Chemistry). Our projects have focused on brominated flame retardants and, most recently, the microbial response to manufactured nanocarbon and black carbon. We combine microcosm and laboratory experiments to observe how microbes and minerals change the chemical nature form of these pollutants and, potentially, alter the rate at which they cycle in natural settings and make their way into living and nonliving reservoirs.

Selected Publications:

Filley,T.R., McCormick,M.K., Crow,S.E., Katalin Szlavecz,K., Whigham,D.F., Johnson,C.T., and Van den Heuvel,R.N. (2007) Comparison of the chemical alteration trajectory of liriodendron tulipifera L. leaf litter among forests with different invasive earthworm activity. (In Press-Journal of Geophysical Research: Biogeosciences).

Dalzell,B.J., Filley,T.R., and Harbor,J.M. (2007) The role of hydrology in annual organic carbon loads and terrestrial organic matter export from a midwestern agricultural watershed GEOCHIMICA ET COSMOCHIMICA ACTA 71 (6): 1448-1462

Filley,T.R., Nierop,K.G.J., and Wang,Y. (2006) The contribution of polyhydroxyl aromatic compounds to tetramethylammonium hydroxide lignin-based proxies ORGANIC GEOCHEMISTRY 37 (6):711-727

Sollins,P., Swanston,C., Kleber,M., Filley,T.R., Kramer,M., Crow, S., Caldwell,B., Lajtha,K., and Bowden,R. (2006) Organic C and N stabilization in a forest soil: evidence from sequential density fractionation. SOIL BIOLOGY & BIOCHEMISTRY, 38:3313-3324

Grannas,A.M., Shepson P.B., and Filley T.R. (2004) Photochemistry and nature of organic matter in Arctic and Antarctic snow. Global Biogeochemical Cycles 18 (1).

Bianchi,T.S., Filley,T.R., Dria,K. and Hatcher,P.G. (2004) Temporal Variability in Sources of Dissolved Organic Carbon in the Lower Mississippi River. Geochimica et Cosmochimica Acta 66:959-967.

Filley,T.R., Cody,G., Goodell B., Jellison,J., Noser,C., Ostrofsky, A. (2002) Lignin demethylation and polysaccharide decomposition in spruce sapwood degraded by brown rot fungi. Organic Geochemistry 33:111-124.

Filley,T.R., Freeman,K.H., and Hatcher,P.G. (2002). Biogeochemical controls on reaction of sedimentary organic matter and aqueous sulfides in Holocene sediments of Mud Lake, Florida. Geochimica et Cosmochimica Acta 66:937-954.

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