Global Biogeochemical Cycles
Total nitrogen (TN) loadings in riverine sediments and their coastal depocenters were compared for Il river systems worldwide to assess the potential impact of riverine particulates on coastal nitrogen budgets. Strong relationships between sediment specific surface area and TN allow these impacts to be estimated without the intense sampling normally required to achieve such budgets. About half of the systems showed higher nitrogen loadings in the riverine sediments than those from the coastal depocenter. In spite of uncertainties, these comparisons indicate that large, turbid rivers, such as the Amazon, Huanghe, and the Mississippi, deliver sediments that in turn release significant or major fractions of the total riverine nitrogen delivery. Riverine particulates must therefore be considered an essential factor in watershed nutrient loading to coastal ecosystems and may affect delivered nutrient ratios as well as total nutrient loading. The relative importance of particulate versus dissolved delivery has decreased over recent decades in the Mississippi as a result of damming and fertilizer use in the watershed.
Mayer, Lawrence M.; Keil, R. G.; Macko, S. A.; Joye, S. B.; Ruttenberg, K. C.; and Aller, R. C., "Importance of Suspended Particulates in Riverine Delivery of Bioavailable Nitrogen to Coastal Zones" (1998). Marine Sciences Faculty Scholarship. 58.
Mayer LM, Keil RG, Macko SA, Joye SB, Ruttenberg KC, Aller RC. Importance of Suspended Particulates in Riverine Delivery of Bioavailable Nitrogen to Coastal Zones. Global Biogeochemical Cycles. 1998;12(4): 573-579. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Copyright 1998 American Geophysical Union.
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