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Toward Explaining Nitrogen and Phosphorus Trends in Chesapeake Bay Tributaries, 1992–2012户口本翻译模板
期刊名称： JAWRA Journal of the American Water Resources Association
作者： Scott W. Ator,Ana Maria García,Gregory E. Schwarz,Joel D.
amendsBlomquist,Andrew J. Sekellick新西兰留学注意事项
作者机构： Maryland‐Delaware‐DC Water Science Center U.S. Geological Survey Baltimore Maryland USA,South Atlantic Water Science Center U.S. Geological Survey Raleigh North Carolina USA,Water Resources Mission Area U.S.
notionalGeological Survey Reston Virginia USA
euro年份： 2019年图片的英文
期号： 第5期
关键词： nutrients;SPARROW modeling;watershed management, time ries analysis;Chesapeake Bay;stream chemistry新东方教师戚颖艳照
bjt
摘要：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 caus of recent nutrient trends in Chesapeake Bay tributaries by relating obrved 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
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