Jennifer Knoepp, Research Soil Scientist

Jennifer Knoepp

Research Emphasis:

Examine the long-term effects of forest management practices, including alternative harvest practices and prescribed burning, on soil chemistry, nutrient availability, and nutrient cycling.Study the effects of changes in soil chemical composition on litter decomposition and nutrient uptake. Examine the changes in nutrient availability, soil chemistry, and soil biological processes along a climatic, vegetation, and elevation gradient.Study the role of coarse wood debris in forest systems in the Southern Appalachians.

CWT Committees:

CWT Science Advisory Committee

Contact Information:

Primary Organization:  USDA Forest Service

Mailing Address:

Dr. Jennifer D. Knoepp
USDA Forest Service
3160 Coweeta Lab Road
Otto, NC 28763

Office Phone:  828.524.2128 x103

FAX Number:  828.369.6768

E-Mail:  jknoepp@fs.fed.us

Web Page:  http://www.srs.fs.usda.gov/coweeta/staff/knoepp/


CWT Data Sets:

CWT_HHS_1145 (Hillslope soil bulk density measurements in Macon County, North Carolina, within the Upper Little Tennessee River Basin.)

CWT_HHS_1144 (Maximum soil depths at 9 hillslope sites, Macon County, North Carolina, within the Upper Little Tennessee River Basin.)

CWT_HHS_1143 (Groundwater well chemistry at 7 hillslope sites located in Macon County, North Carolina, within the Upper Little Tennessee River Basin.)

CWT_HHS_1141 (Hillslope Forest Floor Weights and Oe-Oa Depths at 9 hillslope sites located in Macon County, North Carolina, within the Upper Little Tennessee River Basin.)

CWT_HHS_1140 (Porous tension-cup lysimeter depths and soil water chemistry at 9 hillslope sites located in Macon County, North Carolina, within the Upper Little Tennessee River Basin.)

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CWT Publications and Presentations: (custom bibliography)

Journal Articles

Adams, M., Knoepp, J.D. and Webster, J.R. Inorganic nitrogen retention by watersheds at Fernow Experimental Forest and Coweeta Hydrologic Laboratory. Soil Science Society of America Journal. (DOI: 10.2136/sssaj2013.11.0463nafsc)

Yanai R. D., Tokuchi N., Campbell J. L., Green M. B., Matsuzaki E., Laseter S. N., Brown C. L., Bailey A. S., Lyons P., Levine C. R., Buso D. C., Likens G. E., Knoepp J. D. and Fukushima K. (2014), Sources of uncertainty in estimating stream solute export from headwater catchments at three sites, Hydrological Processes, DOI: 10.1002/hyp.10265

Argerich, A., S.L. Johnson, S.D. Sebestyen, C.C. Rhoades, E. Greathouse, J.D. Knoepp, M.B. Adams, G.E. Likens, J.L. Campbell, W.H. McDowell, F.N. Scatena and G.G. Ice. Trends in stream nitrogen concentrations for forested reference catchments across the USA. 2013. Environmental Research Letters 8:014039 (8pp).

Block, C., Knoepp, J.D. and Fraterrigo, J.M. 2013. Interactive effects of disturbance and nitrogen availability on phosphorus dynamics of southern Appalachian forests. Biogeochemistry. 112:329-342. (DOI: 10.1007/s10533-012-9727-y)

Elliott, Katherine J., Jennifer D. Knoepp, James M. Vose, and William A. Jackson. Interacting effects of wildfire severity and liming on nutrient cycling in a southern Appalachian wilderness area. 2013. Plant and Soil 366:165-183.

Keiser, A., Knoepp, J.D. and Bradford, M. 2013. Microbial communities may modify how litter quality affects potential decomposition rates as tree species migrate. Plant and Soil. (DOI: 10.1007/s11104-013-1730-0)

Block, C., Knoepp, J.D., Elliott, K. and Fraterrigo, J.M. 2012. Impacts of Hemlock Loss on Nitrogen Retention Vary with Soil Nitrogen Availability in the Southern Appalachian Mountains. Ecosystems. 15(7):1108-1120. (DOI: 10.1007/s10021-012-9572-9)

Elliott, K.J., J.M. Vose, J.D. Knoepp, B.D. Clinton. 2012. Restoring shortleaf pine (Pinus echinata)-hardwood ecosystems severely impacted by the southern pine beetle (Dendroctonus frontalis Zimmerman). Forest Ecology and Management 274:181-200.

Knoepp, Jennifer D., James M. Vose, Jerry L. Michael and Barbara C. Reynolds. 2012. Imidacloprid Movement in Soils and Impacts on Soil Microarthropods in Southern Appalachian Eastern Hemlock Stands in Journal of Environmental Quality 41:469-478.

Knoepp, J.D., Vose, J.M. and Clinton, B.D. 2011. Hemlock Infestation and Mortality: Impacts on Nutrient Pools and Cycling in Appalachian Forests. Soil Science Society of America Journal. 75(5):1-11. (DOI: 10.2136/sssaj2010.0409)

Yamashita, Youhei, Brian D. Kloeppel, Jennifer Knoepp, Gregory L. Zausen and Rudolf Jaffe. 2011. Effects of Watershed History on Dissolved Organic Matter Characteristics in Headwater Streams in Ecosystems 14:1110-1122.

Clinton, B. D., J. M. Vose, J. D. Knoepp, K. J. Elliott, B. C. Reynolds, and S. J. Zarnoch. 2010. Can structural and functional characteristics be used to identify riparian zone width in southern Appalachian headwater catchments?. Canadian Journal of Forest Research, 40: 235-353.

Clinton, B.D, J.M. Vose, J.D. Knoepp, K.J. Elliott, and B. Reynolds. 2010. Riparian area structure and function in the southern Appalachian headwater streams. Canadian Journal of Forest Research 40(2): 235-253.

Knoepp, J.D., Clinton, B.D. Riparian zones in southern Appalachian headwater catchments: Carbon and nitrogen responses to forest cutting. Forest Ecology and Management 258(10): 2282-2293.

Knoepp, J.D., Elliott, K.J., Clinton, B.D., Vose, J.M. 2009. Effects of prescribed fire in mixed oak forests of the southern Appalachians: forest floor, soil, and soil solution nitrogen responses. Journal oj the Torrey Botanical Society, 136(3): 380-391

Walker, J.T., Vose, J.M., Knoepp, J., Geron, C.D. 2009. Recovery of Nitrogen Pools and Processes in Degraded Riparian Zones in the Southern Appalachians. Journal of Environmental Quality, 38:1391-1399.

Elliott, K.J., J.M. Vose, J.D. Knoepp,D.W. Johnson, W.t. Swank,and W. Jackson. 2008. Simulated effects of sulfur deposition on nutrient cycling in class I wilderness areas. Journal of Environmental Quality. 37: 1419-1431.

Knoepp, J.D., J.M. Vose, and W.T. Swank. 2008. Nitrogen deposition and cycling across an elevation and vegetation gradient in southern Appalachian forests. International Journal of Environmental Studies. 65(3): 389-408.

Knoepp, J.D., and J.M. Vose. 2007. Regulation of nitrogen mineralization and nitrification in Southern Appalachian ecosystems:separating the relative importance of biotic vs. abiotic controls. Pedobiologia. 51: 89-97.

Elliott, K.J., and J.D. Knoepp. 2005. The effects of three regeneration harvest methods on plant diversity and soil characteristics in the southern Appalachians. Forest Ecology and Management. 211: 296-317.

Ellison, A.M., M.S. Bank, B.D. Clinton, E.A. Colburn, K. Elliott, C.R. Ford, D.R. Foster, B.D. Kloeppel, J.D. Knoepp, G.M. Lovett, J. Mohan, D.A. Orwig, N.L. Rodenhouse, W.V. Sobczak, K.A. Stinson, J.K. Stone, C.M. Swan, J. Thompson, and B. Von. 2005. Loss of foundation species: consequences for the structure and dynamics of forested ecosystems. Frontiers in Ecology and the Environment 3(9): 479-486.

Knoepp, J.D., B.C. Reynolds, D.A. Crossley, W.T. Swank. 2005. Long-term changes in forest floor processes in southern Appalachian forests. Forest Ecology and Management. 220: 300-312.

Hubbard, R.M., J.M. Vose, B.D. Clinton, K.J. Elliott, and J.D. Knoepp. 2004. Stand restoration burning in oak-pine forests in the southern Appalachians: effects on aboveground biomass and carbon and nitrogen cycling. Forest Ecology and Management. 190: 31

Knoepp, J.D., J.M. Vose, and W.T. Swank. 2004. Long-term soil responses to site preparation burning in the southern Appalachians. Forest Science. 50(4): 540-550.

Johnson, D.W., J.D. Knoepp, W.T. Swank, J. Shan, L.A. Morris, D.H. Van Lear, and P.R. Kapeluck. 2002. Effects of forest management on soil carbon: results of some long-term resampling studies. Environmental Pollution. 116: S201-S208.

Knoepp, J.D., and W.T. Swank. 2002. Using soil temperature and moisture to predict forest soil nitrogen mineralization. Biology & Fertility of Soils. 36: 177-182.

Knoepp, J.D., D.C. Coleman, D.A. Crossley Jr., and J.S. Clark. 2000. Biological indices of soil quality; an ecosystem case study of their use. Forest Ecology and Management. 138: 357-368.

Vose, J.M., W.T. Swank, B.D. Clinton, J.D. Knoepp, and L.W. Swift. 1999. Using stand replacement fires to restore southern Appalachian pine-hardwood ecosystems: effects on mass, carbon, and nutrient pools. Forest Ecology and Management. 114: 215-226.

Knoepp, J.D., and W.T. Swank. 1998. Rates of nitrogen mineralization across an elevation and vegetation gradient in the southern Appalachians. Plant and Soil. 204: 235-241.

Knoepp, J.D., and W.T. Swank. 1997. Forest management effects on surface soil carbon and nitrogen. Soil Science Society of America Journal. 61(3): 928-935.

Knoepp, J.D., and W.T. Swank. 1997. Long-term effects of commercial sawlog harvest on soil cation concentrations. Forest Ecology and Management. 93: 1-7.

Knoepp, J.D., and W.T. 1995. Comparison of available soil nitrogen assays in control and burned forested sites. SwankSoil Science Society of America Journal. 59: 1750-1754.

Knoepp, J.D., and W.T. Swank. 1994. Long-term soil chemistry changes in aggrading forest ecosystems.Soil Science Society of America Journal 58: 325-331.

Knoepp, J.D., and W.T. Swank. 1993. Site preparation burning to improve southern Appalachian pin-hardwood stands: nitrogen responses in soil, soil water, and streams. Canadian Journal of Forest Research 23: 2263-2270.

Books and Book Sections

Knoepp, Jennifer D.; Swank, Wayne T.; Haines, Bruce L. 2014. Long- and short- term changes in nutrient availability following commercial sawlog harvest via cable logging. In: Swank, Wayne T.; Webster, Jackson R., comps., eds. Long-term response of a forest watershed ecosystem. Clearcutting in the southern Appalachian. Oxford University Press: 57-84. Chapter 4.

Meyer, Judy L.; Webster, Jackson, R.; Knoepp, Jennifer D.; Benfield, E.F. 2014. Dynamics of dissolved organic carbon in a stream during a quarter century of forest succession. In: Swank, Wayne T.; Webster, Jackson R., comps., eds. Long-term response of a forest watershed ecosystem. Clearcutting in the southern Appalachian. Oxford University Press: 102-117. Chapter 6.

Swank, Wayne T.; Knoepp, Jennifer D.; Vose, James M.; Laseter, Stephanie N.; Webster, Jackson, R. 2014. Response and recovery of water yield and timing, stream sediment, abiotic parameters, and stream chemistry following logging. In: Swank, Wayne T.; Webster, Jackson R., comps., eds. Long-term response of a forest watershed ecosystem. Clearcutting in the southern Appalachian. Oxford University Press: 36-56. Chapter 3.

Webster, J.R., Swank, W.T., Vose, J.M., Knoepp, J.D. and Elliott, K.J. 2014. Bridging the gap between ecosystem theory and forest watershed management. A synthesis of 30+ years of research on WS 7. Pages 229-247 in: Swank, W.T. and Webster, J.R. (editors). Long-term response of a forest watershed ecosystem. Clearcutting in the southern Appalachian. Oxford University Press.

Webster, J.R., Benfield, E.F., Cecala, K.K., Chamblee, J.F., Dehring, C.A., Gragson, T.L., Cymerman, J.H., Jackson, C.R., Knoepp, J.D., Leigh, D.S., Maerz, J.C., Pringle, C., Valett, H.M., 2012. Water Quality and Exurbanization in Southern Appalachian Streams. In River Conservation and Management (Chapter on Catchment Conservation, Ecosystem Integrity and Threats to River Systems). P.J. Boon and P.J. Raven, eds. Published 2012 by John Wiley & Sons, Ltd., p. 91-107

Conference Proceedings (Published Papers and Abstracts)

Vose, J.M., Ford, C.R., Knoepp, J.D., Elliott, K.J., 2010. "Impacts of eastern hemlock mortality on ecosystem function: A guide to restoration strategies in the southern Appalachians." The 95th ESA Annual Meeting, August 1-6, 2010

Knoepp, J.D., J.M. Vose, K.J. Elliott, B.D. Clinton, C.R. Ford, and B.D. Kloeppel. 2005. Hemlock Woolly Adelgid Research at the Coweeta Hydrologic Laboratory. In Proceedings, Save our hemlocks third symposium on hemlock woolly adelgid in the eastern United States.

Elliott, K.J., J.M. Vose, B.D. Clinton, and J.D. Knoepp. 2004. Effects of understory burning in a mesic mixed-oak forest o fthe southern Appalachians, pp. 272-283. In Engstrom, R.T., K.E.M. Galley, and W.J. de Groot (eds.), Proceedings of the 22nd Tall Timbers Fire Ecology Conference: Fire in Temperate, Boreal, and Montane Ecosystems. Tallahassee, FL. Tall Timbers Research Station, Tallahassee, FL.

Clinton, B.D., J.M. Vose, J.D. Knoepp, and K.J. Elliott. 2003. Stream nitrate response to different burning treatments in southern Appalachian forests, pp. 174-181. In Galley, K.E.M., R.C. Kilinger, and N.G. Sugihara (eds.), Proceedings of Fire Conference 2000: The First National Congress on Fire Ecology, Prevention, and Management. Tallahassee, FL. Miscellaneous Publication No. 13. Tall Timbers Research Station, Tallahassee, FL.

Conference Posters and Presentations

Elliott, Katherine J., James M. Vose, Jennifer D. Knoepp and William Jackson. 2012. Effects of Wildfire and Liming of Pine-Oak-Heath Communities in the Linville Gorge Wilderness, Western North Carolina. Proceedings of the 4th Fire in Eastern Oak Forests Conference 230-234.

Jennifer D. Knoepp, James M. Vose, Barton D. Clinton, and Mark D. Hunter, 2010. "Eastern Hemlock in Southern Appalachian Forests and the Impacts of Hemlock Woolly Adelgid on Nutrient Pools and Cycling," Fifth Symposium on Hemlock Woolly Adelgid in the Eastern United States, Asheville NC, August 2010

Jennifer D. Knoepp, James M. Vose, Jerry L. Michael, and Barbara C. Reynolds, 2010. "Imidacloprid Application in Low and High Elevation Eastern Hemlock Stands in the Southern Appalachians: Movement in Soils and Impacts on Soil Microarthropods," Fifth Symposium on Hemlock Woolly Adelgid in the Eastern United States, August 17-19, 2010.

S. L. Johnson, M. B. Adams, D. M. Amatya, S. W. Bailey, C. C. Rhoades, J. B. Jones, J. D. Knoepp, W. McCaughey, W. H. McDowell, K. J. McGuire, S. D. Sebestyen, P. M. Wohlgemuth, 2009. "Stream Nutrient Responses to Forest Harvest and Disturbance: Lessons From Long-Term Research at USFS Experimental Forests." 7th North American Forest Ecology Workshop, June 22-26, 2009.

Reports

Elliott, Katherine, Jim Vose, and Jennifer Knoepp. 2012. Compass LiveSRS publication--5/22/2012: Southern Pine Beetle Impacts on Forests: http://www.srs.fs.usda.gov/compass/2012/05/22/southern-pine-beetle-impacts-on-forests/

Knoepp, J.D., and J.M. Vose. 2002. Quantitative comparison of In Situ soil CO2 flux measurement methods: Research Paper SRS-28. USDA Forest Service, Southern Research Station, Asheville, NC.

Knoepp, J.D., L.L. Tieszen, and G.G. Fredlund. 1998. Assessing the vegetation history of three Southern Appalachian balds through soil organic matter analysis: Res. Pap. SRS-13. USDA Forest Service, Southern Research Station, Asheville, NC.

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