The Net Anthropogenic Nitrogen Inputs (NANI) and Phosphorus Inputs (NAPI) Toolboxes
References
Boyer, E. W., C. L. Goodale, N. A. Jaworski, and R. W. Howarth. 2002. Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern USA. Biogeochemistry 57/58: 137-169
Han, H. J. and J. D. Allan. 2008. "Estimation of nitrogen inputs to catchments: comparison of methods and consequences for riverine export prediction." Biogeochemistry 91(2-3): 177-199.
Hayakawa, A., Woli, KP., Shimizu, M., Nomaru, K., Kuramochi, K., & Hatano, R. 2009. Nitrogen budget and relationships with riverine nitrogen exports of a dairy cattle farming catchment in eastern Hokkaido, Japan. SOIL SCIENCE AND PLANT NUTRITION 55 (6): 800-819
Howarth, R.W., G. Billen, D. P. Swaney, A. Townsend, N. Jaworski, K. Lajtha, J. A. Downing, R. Elmgren, N. Caraco, T. Jordan, F. Berendse, J. Freney, V. Kudeyarov, P. Murdoch, Zhu Zhao-liang. 1996. Riverine Inputs of Nitrogen to the North Atlantic Ocean: Fluxes and Human Influences. Biogeochemistry, 35:75-139.
Howarth, R.W., D.P. Swaney, E.W. Boyer, R.M. Marino, N. Jaworski and C.L. Goodale. 2006. The influence of climate on average nitrogen export from large watersheds in the Northeastern United States. Biogeochemistry. 79: 163-186.
Ruddy, B.C., Lorenz, D.L., and Mueller, D.K., 2006, County-Level Estimates of Nutrient Inputs to the Land Surface of the Conterminous United States, 1982–2001: U.S. Geological Survey Scientific Investigations Report 2006-5012, 17 p.
Russell, M. J., Weller, D.E. , Jordan, T.E., Sigwart, K.J. and Sullivan, K.J. 2008. Net Anthropogenic Phosphorus Inputs: Spatial and Temporal Variability in the Chesapeake Bay Region. Biogeochemistry. 88(3): 285-304.
Schaefer, S.C., Hollibaugh, J.T. and Alber, M. 2009. Watershed nitrogen input and riverine export on the west coast of the U.S. Biogeochemistry. 93(3):219-233.
Schaefer, S.C. and Alber, M.A. 2007. Temperature controls a latitudinal gradient in the proportion of waterhsed nitrogren exported to coastal ecosystems. Biogeochemistry. 85:333-346.
Sferratore, A., Garnier, J., Billen, G., Conley, D.J., and Pinault, S. 2006. Diffuse and Point Sources of Silica in the Seine River Watershed. Environmental Science and Technology. 40, 6630-6635.