Skip to main content Skip to navigation
Roley Lab Watershed Biogeochemistry


Published or in press

30) Kasanke, S.A., Moran, J.A., Cheeke, T.E., and Roley, S.S. Tripartite interactions among free-living, N-fixing bacteria, arbuscular mycorrhizal fungi, and plants: Mutualistic benefits and community response to co-inoculation. In press at Soil Society of America Journal.

29) Roley, S.S., Arango, C.P., Alexiades, A.V. Seasonal and watershed-scale patterns in biofilm nutrient
limitation: exploring silica’s influence. In press at Freshwater Science.

28) Roley, S.S., Hall, R.O., Perkins, W., Garayburu-Caruso, V., and Stegen, J.C. 2023. Coupled primary
production and respiration in a large river contrasts with smaller rivers and streams. Limnology and
Oceanography. 68: 2461-2475.

27) Gupta, V.V.S.R. and Roley, S.S. 2023. Nitrogen: Non-symbiotic nitrogen fixation in soils. In: Goss,
Michael and Oliver, Margaret (eds.) Encyclopedia of Soils in the Environment, 2nd edition. 1: 283-292.
UK: Elsevier.

26) Bakker, E.A.H., Vizza, C., Arango, C.P., Roley, S.S. 2022. Nitrogen fixation rates in forested mountain streams: Are sediment microbes more important than previously thought? Freshwater Biology. 67:1395-1410.

25) Rastetter, E.B., Kwiatkowski, B.L., Kicklighter, D.W., Barker Plotkin, A., Genet, H., Mann, T., Nippert, J., O’Keefe, K., Perakis, S.S., Porder, S., Roley, S.S., Ruess, R.W., Thompson, J.R., Wieder, W.R., Wilcox, K., Yanai, R. 2022. Nitrogen and phosphorus constrain carbon gain in terrestrial ecosystems under climate change: the roles of nutrient redistribution and accumulation and of changes in plant and soil stoichiometry. Ecological Applications. e2684.

24) Li, B.-B., Roley, S.S., Duncan, D., Guo, J., Quensen, J., Yu, H.-Q., Tiedje, J.M. 2021. Long-term excess nitrogen fertilizer increases sensitivity of soil microbial community to seasonal change revealed by ecological network and metagenome analyses.  Soil Biology and Biochemistry. 160: 108349.

23) Trentman, M.T., Tank, J.L., Davis, R.T., Hanrahan, B.R., Mahl, U.H., Roley, S.S. 2021. Watershed-scale land use change increases metabolic function in an agricultural stream. Ecosystems.

22) Belanger, M.A., Vizza, C., Robertson, G.P., and Roley, S.S. 2021. Quantifying and correcting for pre-assay CO2 loss in short-term carbon mineralization assays. SOIL. 7:45-52.

21) Roley, S.S. 2021. Diazotrophic Nitrogen Fixation in the Rhizosphere and Endosphere. In: Rhizosphere Processes. Editors: VVSR Gupta, A.K. Sharma. Pages 93-108. Springer Books: Singapore.

20) Ulbrich, T.C., Friesen, M., Roley, S.S., Tiemann, L.K., and Evans, S.E. 2021. Intraspecific variability in root traits and edaphic conditions influence soil microbiomes across 12 switchgrass cultivars. Phytobiomes Journal.

19) Roley, S.S., Ulbrich, T.C., and Robertson, G.P. 2021. Nitrogen fixation and resorption efficiency differences among twelve upland and lowland switchgrass cultivars. Phytobiomes Journal.

18) Xu, J., Roley, S.S., Tfaily, M.M., Chu, R.K., Tiedje, J.M. 2020. Organic amendments change soil organic C structure and microbial community but not total organic matter on sub-decadal scales. Soil Biology and Biochemistry. 150: 107986.

17) Roley, S.S., Xue, C., Hamilton, S.K., Tiedje, J.M., and Robertson, G.P. 2019. Episodic nitrogen fixation in switchgrass (Panicum virgatum L.). Soil Biology and Biochemistry.129: 90-98. doi: 10.1016/j.soilbio.2018.11.006

16) Roley, S.S., Duncan, D.S., Liang, D., Garoutte, A., Tiedje, J.M., Jackson, R.D., and Robertson, G.P. Associative nitrogen fixation (ANF) in switchgrass (Panicum virgatum) across a nitrogen input gradient. 2018. PLoS ONE 13(6): e0197320. doi: 10.1371/journal.pone.0197320

15) Roley, S.S., Tank, J.L., Cook, P.L.M., and Grace, M.R. 2018. The influence of an invasive plant on denitrification in an urban wetland. Freshwater Biology. doi: 10.1111/fwb.13073

14) Sanford, G.R., Jackson, R.D., Oates, L.G., Robertson, G.P., Roley, S.S., and Thelen, K.T.  2017. Bioethanol yields and quality components in seven lignocellulosic biomass crops grown in the North Central USA. Agronomy Journal. 109:1-12. doi:10.2134/agronj2016.08.0454.

13) Zhang, B., Penton, C.R., Xue, C., Quensen, J., Roley, S.S., Guo, J., Garoutte, A., Zheng, T., and Tiedje, J.M., 2017. Depth-related analyses of soil bacterial communities under ten biofuel cropping systems. Soil Biology and Biochemistry. 112: 140-152. doi: 10.1016/j.soilbio.2017.04.019

12) Roley, S.S. and Tank, J.L. 2016. Pore water physicochemical constraints on the endangered clubshell mussel, Pleurobema clava. Canadian Journal of Fisheries and Aquatic Sciences. 73: 1712-1722. doi: 10.1139/cjfas-2015-0442.

11) Roley, S.S., Tank, J.L., Tyndall, J.C., and Witter, J.  2016. How cost-effective are cover crops, wetlands, and two-stage ditches for nitrogen removal in the Mississippi River Basin?  Water Resources and Economics.  15:43-56. doi: 10.1016/j.wre.2016.06.003

10) Mahl, U.H., Tank, J.L., Roley, S.S., and Davis, R.T. 2015. Floodplains constructed via the two-stage ditch enhance N-removal capacity and reduce turbidity and dissolved P in streams.  Journal of the American Water Resources Association.  1-18.  doi: 10.1111/1752-1688.12340

9) Davis, R.T., Tank, J.L., Mahl, U.H., Winikoff, S.G., and Roley, S.S.  2015. The influence of floodplain construction via the two-stage ditch on water column nutrients and sediments in agricultural streams.  Journal of the American Water Resources Association. 1-15.  doi: 10.1111/1752-1688.12341

8) Roley, S.S., Griffiths, J.R., Levi, P.S., Patrick, C.J., Sadro, S., and Zarnetske, J.P. 2014. Taking the pulse of the ecosystem: progress in quantifying aquatic ecosystem health.  Eco-DAS X Symposium Proceedings.  Eco-DAS X Chapter 7: 101-118. doi: 10.4319/

7) Roley, S.S., Tank, J.L., Griffiths, N.A., Hall, R.O., and Davis, R.T.  2014.  The influence of floodplain restoration on whole-stream metabolism in an agricultural stream: insights from a 5-year continuous data set.  Freshwater Science. 33: 1043-1059.  doi:10.1086/677767.

6) Griffths, N.A., Tank, J.L., Royer, T.V., Roley, S.S., Rosi-Marshall, E.J., Whiles, M.R., Beaulieu, J.J., and Johnson, L.T.  2013.  Agricultural land use alters the seasonality and magnitude of stream metabolism. Limnology and Oceanography. 58:1513-1529. doi: 10.4319/lo.2013.58.4.1513

5) Roley, S.S., Tank, J.L., and Williams, M.A.  2012.  Hydrologic connectivity increases denitrification in the hyporheic zone and restored floodplains of an agricultural stream.  Journal of Geophysical Research – Biogeosciences.  117, G00N04, doi: 10.1029/2012/JG001950.

4) Griffiths, N.A., Tank, J.L., Roley, S.S., and Stephen, M.L.  2012.  Decomposition of maize leaves and grasses in restored agricultural streams.  Freshwater Science. 31: 848-864. doi: 10.1899/11-095.1

3) Roley, S.S., Tank, J.L., Stephen, M.L., Johnson, L.T., Beaulieu, J.J., and Witter, J.D.  2012.  Floodplain restoration enhances denitrification and reach-scale nitrogen removal in an agricultural stream.  Ecological Applications 22:281-297. doi:10.1890/11-0381.1

2) Roley, S.S. and R.M. Newman. 2008. Predicting Eurasian watermilfoil invasions in Minnesota.  Lake and Reservoir Management.  24: 361-369. doi: 10.1080/07438140809354846

*nominee, LaBounty Award for Best Paper, North American Lake Management Society*

1) Roley, S.S. and R.M. Newman.  2006.  The developmental performance of the milfoil weevil, Euhrychiopsis lencontei (Coleoptera: Curculionidae), on Eurasian, northern, and hybrid (Eurasian x northern) watermilfoils.  Environmental Entomology. 35:121-126