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- W2945184802 endingPage "1168" @default.
- W2945184802 startingPage "1149" @default.
- W2945184802 abstract "Abstract Understanding trends in stream chemistry is critical to watershed management, and often complicated by multiple contaminant sources and landscape conditions changing over varying time scales. We adapted spatially referenced regression (SPARROW) to infer causes of recent nutrient trends in Chesapeake Bay tributaries by relating observed fluxes during 1992, 2002, and 2012 to contemporary inputs and watershed conditions. The annual flow‐normalized nitrogen flux to the bay from its watershed declined by 14% to 127,000 Mg (metric tons) between 1992 and 2012, due primarily (more than 80% of the decline) to reduced point sources. The remainder of the decline was due to reduced atmospheric deposition (13%) and urban nonpoint sources. Agricultural inputs, which contribute most nitrogen to the bay, changed little, although trends in the average nitrogen yield (flux per unit area) from cropland and pasture to streams in some settings suggest possible effects of evolving nutrient applications or other land management practices. Point sources of phosphorus to local streams declined by half between 1992 and 2012, while nonpoint inputs were relatively unchanged. Annual phosphorus delivery to the bay increased by 9% to 9,570 Mg between 1992 and 2012, however, due mainly to reduced retention in the Susquehanna River at Conowingo Reservoir." @default.
- W2945184802 created "2019-05-29" @default.
- W2945184802 creator A5002051538 @default.
- W2945184802 creator A5010872664 @default.
- W2945184802 creator A5023748652 @default.
- W2945184802 creator A5030390623 @default.
- W2945184802 creator A5072448596 @default.
- W2945184802 date "2019-05-24" @default.
- W2945184802 modified "2023-10-16" @default.
- W2945184802 title "Toward Explaining Nitrogen and Phosphorus Trends in Chesapeake Bay Tributaries, 1992–2012" @default.
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