globalchange  > 气候变化与战略
DOI: 10.1029/2019GB006475
Long-Term Trajectory of Nitrogen Loading and Delivery From Mississippi River Basin to the Gulf of Mexico
Author: Tian H.; Xu R.; Pan S.; Yao Y.; Bian Z.; Cai W.-J.; Hopkinson C.S.; Justic D.; Lohrenz S.; Lu C.; Ren W.; Yang J.
Source Publication: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
Publishing Year: 2020
Volume: 34, Issue:5
Language: 英语
Keyword: estuarine front ; hypoxic conditions ; long-term change ; nitrogen cycle ; organic nitrogen ; river basin ; spatiotemporal analysis ; water quality ; Atlantic Ocean ; Gulf of Mexico ; Mississippi River ; United States
Abstract: The large areal extent of hypoxia in the northern Gulf of Mexico has been partially attributed to substantial nitrogen (N) loading from the Mississippi River basin, which is driven by multiple natural and human factors. The available water quality monitoring data and most of the current models are insufficient to fully quantify N load magnitude and the underlying controls. Here we use a process-based Dynamic Land Ecosystem Model to examine how multiple factors (synthetic N fertilizer, atmospheric N deposition, land use changes, climate variability, and increasing atmospheric CO2) have affected the loading and delivery of total nitrogen (TN) consisting of ammonium and nitrate (dissolved inorganic N) and total organic nitrogen from the Mississippi River basin during 1901–2014. The model results indicate that TN export during 2000–2014 was twofold larger than that in the first decade of twentieth century: Dissolved inorganic N export increased by 140% dominated by nitrate; total organic nitrogen export increased by 53%. The substantial enrichment of TN export since the 1960s was strongly associated with increased anthropogenic N inputs (synthetic N fertilizer and atmospheric N deposition). The greatest export of TN was in the spring. Although the implementation of N reduction has been carried out over the past three decades, total N loads to the northern Gulf of Mexico have not decreased significantly. Due to the legacy effect from historical N accumulation in soils and riverbeds, a larger reduction in synthetic N fertilizer inputs as well as improved N management practices are needed to alleviate ocean hypoxia in the northern Gulf of Mexico. ©2020. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:1   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, United States; School of Marine Science and Policy, University of Delaware, Newark, DE, United States; Department of Marine Sciences, University of Georgia, Athens, GA, United States; College of the Coast and Environment, Louisiana State University, Baton Rouge, LA, United States; School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, MA, United States; Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA, United States; College of Agriculture, Food and Environment, University of Kentucky, Lexington, KY, United States; College of Forest Resources, Mississippi State University, Starkville, MS, United States

Recommended Citation:
Tian H.,Xu R.,Pan S.,et al. Long-Term Trajectory of Nitrogen Loading and Delivery From Mississippi River Basin to the Gulf of Mexico[J]. Global Biogeochemical Cycles,2020-01-01,34(5)
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