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Yun-Ya Yang

Principal Faculty Specialist

Principal Faculty Specialist

0117 H.J. Patterson Hall College Park, Maryland 20742


  • Nutrient Management
  • Water Quality
  • soil health
  • Environmental Science
  • Soil Chemistry
  • Edge-of-the field nutrient losses
  • Emerging Contaminants
  • Stable isotopes
  • Contaminant Transport


  • Ph.D., Environmental Soil Chemistry, Colorado State University, USA
  • M.S., Soil and Environmental Sciences, National Chung Hsing University, Taiwan
  • B.S., Soil and Environmental Sciences, National Chung Hsing University, Taiwan


My current research focuses on two topics i) impacts of agricultural management practices (e.g., cover crops, tillage, amendments) on soil health and ii) edge-of-field nitrogen and phosphorus transfer from agricultural catchments.

Past Projects: 

  • Sources and Transport Mechanisms of Nitrogen and Phosphorus in Urban Stormwater Runoff
  • Emerging Contaminants in Onsite Wastewater Treatment Systems
  • Occurrence, Fate, and Transport of Steroid Hormones in the Environment


Google Scholar Weblink

Peer-Reviewed Publications:

Soil Health:

Toor, G.S., Yang, Y-Y., Das, S., Felton, G., Dorsey, S. 2021. Soil Health in Agricultural Ecosystems: Current Status and Future Perspectives. Advances in Agronomy. DOI: 10.1016/bs.agron.2021.02.004.

Roswall, T., Lucas, E., Yang, Y-Y., Burgis, C., Scott, I., Toor, G.S. 2021. Hot Spot of Legacy Phosphorus in Agricultural Landscapes: Revisiting Water Extractable Phosphorus Pool. Water. 13(8): 1006. DOI: doi:10.3390/w13081006.

Yang, Y-Y., Goldsmith, A., Herold, I., Lecha, S., Toor, G.S. 2020. Assessing Soil Organic Carbon in Soils to Enhance and Track Future Carbon Stocks. Agronomy.10(8): 1139. DOI: 10.3390/agronomy10081139. 

Toor, G.S., Yang, Y-Y., Morris, M., Schwartz, P., Darwish, Y., Gaylord, G., Webb, K. 2020. Phosphorus Pools in Soils Under Rotational and Continuous Grazed Pastures. Agrosystems. 3(1): e20103. DOI: 10.1002/agg2.20103.

Urban Water Quality:

Yang, Y-Y., Asal, S., Toor, G.S. 2021. Residential Catchments to Coastal Waters: Forms, Fluxes, and Mechanisms of Phosphorus Transport. Science of the Total Environment. 765: 142767. DOI: 10.1016/j.scitotenv.2020.142767.

Jani, J., Lusk, M.G., Yang, Y-Y., Toor, G.S. 2020. Wet Season Nitrogen Export from A Residential Stormwater Pond. PLoS ONE. 15(4): e0230908. DOI: 10.1371/journal.pone.0230908.

Jani, J., Yang, Y-Y., Lusk, M.G., Toor, G.S. 2020. Composition of Nitrogen in Urban Residential Stormwater Runoff: Concentrations, Loads, and Source Characterization of Nitrate and Organic Nitrogen. PLoS ONE. 15(2): e0229715. DOI: 10.1371/journal.pone.0229715.

Yang, Y-Y., Toor, G.S. 2018. Stormwater Runoff Driven Phosphorus Transport in an Urban Residential Catchment: Implications for Protecting Water Quality in Urban Watersheds. Scientific Reports. 8: 11681. DOI: 10.1038/s41598-018-29857-x.

Yang, Y-Y., Lusk, M.G. 2018. Nutrients in Urban Stormwater Runoff: Current State of the Science and Potential Mitigation Options. Current Pollution Reports. 4: 112-127. DOI: 10.1007/s40726-018-0087-7.

Toor, G.S., Occhipinti, M.L., Yang, Y-Y., Majcherek, T., Haver, D., Oki, L. 2017. Managing Urban Runoff in Residential Neighborhoods: Nitrogen and Phosphorus in Lawn Irrigation Driven Residential Runoff. PLoS ONE. 12, e0179151. DOI: 10.1371/journal.pone.0179151.

Yang, Y-Y., Toor, G.S. 2017. Sources and Mechanisms of Nitrate and Orthophosphate Transport in Urban Stormwater Runoff from Residential Catchments. Water Research. 112: 176-184. DOI: 10.1016/j.watres.2017.01.039.

Yang, Y-Y., Toor. G.S. 2016. δ15N and δ18O Reveal the Sources of Nitrate-Nitrogen in Urban Residential Stormwater Runoff. Environmental Science & Technology. 50: 2881-2889. DOI: 10.1021/acs.est.5b05353.

Emerging Contaminants:

Yang, Y-Y., Toor, G.S., Wilson, P.C., Williams, C.F. 2017. Micropollutants in Groundwater from Septic Systems: Transformations, Transport Mechanisms, and Human Health Risk Assessment. Water Research. 123, 258-267. DOI: 10.1016/j.watres.2017.06.054.

Lusk, M.G., Toor, G.S., Yang, Y-Y., Mechtensimer, S., De, M., Obreza, T.A. 2017. A Review of the Fate and Transport of Nitrogen, Phosphorus, Pathogens, and Trace Organic Chemicals in Onsite Wastewater Treatment Systems. Critical Review in Environmental Science and Technology. 47, 455-541. DOI: 10.1080/10643389.2017.1327787.

Gray, J.L., Borch, T.S., Furlong, E.T., Davis, J.G., Yager, T.J., Yang, Y-Y., Kolpin, D.W. 2017. Rainfall Runoff of Anthropogenic Waste Indicators from Agricultural Fields Applied with Municipal Biosolids. Science of the Total Environment. 580, 83-89. DOI: 10.1016/j.scitotenv.2016.03.033.

Yang, Y-Y., Toor, G.S., Wilson, P.C., Williams, C.F. 2016. Septic Systems as Hot-Spots of Pollutants in the Environment: Fate and Mass Balance of Micropollutants in Septic Drainfields. Science of the Total Environment. 566-567: 1535-1544. DOI: 10.1016/j.scitotenv.2016.06.043.

Yang, Y-Y., Toor, G.S., Williams, C.F. 2015. Pharmaceuticals and Organochloride Pesticides in Sediments of an Urban River in Florida, United States. Journal of Soils and Sediments. 15: 993-1004. DOI: 1007/s11368-015-1077-7.

Yang, Y-Y., Gray, J.L., Furlong, E.T., Davis, J.G., ReVello, R.C., Borch, T. 2012. Steroid Hormone Runoff from an Agricultural Field Applied with Municipal Biosolids. Environmental Science & Technology. 46: 2746-2754. DOI: 10.1021/es203896t.

Yang, Y-Y., Pereyre, L.P., Young, R.B., Reardon, K.F., Borch, T. 2011. Testosterone-Mineralizing Culture Enriched from Swine Manure: Characterization of Degradation Pathways and Microbial Community Composition. Environmental Science & Technology. 45: 6879-6886. DOI: 10.1021/es2013648.

Yang, Y-Y., Borch, T., Young, R.B., Goodridge, L.D., Davis, J.G. 2010. Degradation Kinetics of Testosterone by Manure-Borne Bacteria: Influence of Temperature, pH, Glucose Amendments, and Dissolved Oxygen. Journal of Environmental Quality. 39: 1153-1160. DOI: 10.2134/jeq2009.0112.