Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.

By E. Boyer, C. Goodale, N. Jaworski, R. Howarth. 2002

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Humans, Hydrology, and the Distribution of Inorganic Nutrient Loading to the Ocean (2003, result): “We had expected that, as in previous studies (e.g., Boyer et al. 2002), land use, as well as land area, might explain a significant part of the variation in nutrient loading.”
Influences of natural and anthropogenic factors on surface and groundwater quality in rural and urban areas (2015, background): “Urbanization-related activities have been found to increase nitrogen, phosphorus, alkalinity, and the total dissolved solids in surface waters (Johnson et al. 1997; Boyer et al. 2002; Gergel 2005).”
Large‐Scale Assessment of Symbiotic Dinitrogen Fixation by Crops: Soybean and Alfalfa in the Mississippi River Basin (2004, background): “…within regional mean rates used by others large area of the region may be receiving between 23 and 40 kg N ha 1 from ammonia redeposition (Burkart(Boyer et al., 2002; McIsaac et al., 2002) and correspond to site-specific reports in the literature, which range and James, 1999), and it would be…”
The Role of Headwater Streams in Downstream Water Quality (2007, background): “Nitrogen fluxes in surface waters are controlled to a large degree by heterogeneous distributions of nitrogen inputs (Howarth et al., 1996; Boyer et al., 2002).”