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

@article{Boyer2002AnthropogenicNS,
  title={Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.},
  author={Elizabeth W. Boyer and Christine L Goodale and Norbert A. Jaworski and Robert W. Howarth},
  journal={Biogeochemistry},
  year={2002},
  volume={57-58},
  pages={137-169}
}
Human activities have greatly altered the nitrogen (N) cycle, accelerating the rate of N fixation in landscapes and delivery of N to water bodies. To examine relationships between anthropogenic N inputs and riverine N export, we constructed budgets describing N inputs and losses for 16 catchments, which encompass a range of climatic variability and are major drainages to the coast of the North Atlantic Ocean along a latitudinal profile from Maine to Virginia. Using data from the early 1990's… Expand
Riverine nitrogen export from the continents to the coasts
[1] We present an overview of riverine nitrogen flux calculations that were prepared for the International Nitrogen Initiative's current global assessment of nitrogen cycles: past, present, andExpand
Where did all the nitrogen go? Fate of nitrogen inputs to large watersheds in the northeastern U.S.A.
To assess the fate of the large amounts of nitrogen (N) brought into the environment by human activities, we constructed N budgets for sixteen large watersheds (475 to 70,189 km2) in the northeasternExpand
Net anthropogenic nitrogen inputs to watersheds and riverine N export to coastal waters: a brief overview
In recent years, watershed-scale nutrient accounting methods have been developed which provide a simple yet powerful approach to estimate major anthropogenic sources of nutrients to terrestrial andExpand
Influence of climate and human activities on the relationship between watershed nitrogen input and river export.
TLDR
Application of this model to three scenarios of future land use, including business as usual, greater reliance on organic farming methods, and expanded corn-based ethanol production, and two climate scenarios, suggests that riverine N export is likely to increase by as much as 24% in response to heavierfertilizer use for expanded corn production and a 10% increase in annual discharge. Expand
Influences of climate, hydrology, and land use on input and export of nitrogen in California watersheds
Human activities have greatly increased the input of biologically available nitrogen (N) from land-based sources to aquatic ecosystems; yet few studies have examined how human actions influence NExpand
Dominance of organic nitrogen from headwater streams to large rivers across the conterminous United States
[1] The frequency and magnitude of hypoxic areas in coastal waterbodies are increasing across the globe, partially in response to the increase in nitrogen delivery from the landscape (Diaz, 2001;Expand
Nitrogen and phosphorus budgets for a tropical watershed impacted by agricultural land use: Guayas, Ecuador
Large-scale changes in land use are occurring in many tropical regions, with significant impacts on nitrogen and phosphorus biogeochemistry. In this study we examine the relationships between landExpand
Nitrogen fluxes from the landscape are controlled by net anthropogenic nitrogen inputs and by climate
The flux of nitrogen (N) to coastal marine ecosystems is strongly correlated with the “net anthropogenic nitrogen inputs” (NANI) to the landscape across 154 watersheds, ranging in size from 16 km2 toExpand
Changes in anthropogenic nitrogen and phosphorus inputs to the St. Lawrence sub‐basin over 110 years and impacts on riverine export
Human activities have increased the flow of nitrogen (N) and phosphorus (P) over much of the Earth, leading to increased agricultural production, but also the degradation of air, soil, and waterExpand
Accounting methods, uncertainties and influential factors of net anthropogenic nitrogen input (NANI)
TLDR
Across a wide range of watersheds, NANI has been shown to be a good predictor of riverine N exports, and its magnitudes have strong relationships with hydro-climatic conditions such as precipitation, discharge and temperature. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 50 REFERENCES
Where did all the nitrogen go? Fate of nitrogen inputs to large watersheds in the northeastern U.S.A.
To assess the fate of the large amounts of nitrogen (N) brought into the environment by human activities, we constructed N budgets for sixteen large watersheds (475 to 70,189 km2) in the northeasternExpand
Dissolved organic nitrogen budgets for upland, forested ecosystems in New England
Relatively high deposition ofnitrogen (N) in the northeastern United States hascaused concern because sites could become N saturated.In the past, mass-balance studies have been used tomonitor the NExpand
Atmospheric Deposition of Nitrogen Oxides onto the Landscape Contributes to Coastal Eutrophication in the Northeast United States
Recently compiled data document a 3−8-fold increase in nitrate fluxes from 10 watersheds in the Northeast United States since the early 1900s. During this period, nitrogen oxide emissions fromExpand
HUMAN IMPACT ON NITRATE EXPORT : AN ANALYSIS USING MAJOR WORLD RIVERS
TLDR
A simple model that related NO3 export to point-source N loading and nonpoint source N loads from chemical fertilizers and NOY deposition and tested it at the global scale using data from 35 large rivers with a global distribution suggests that human activity is the dominant control ofNO3 export. Expand
SOIL NITROGEN TRANSFORMATIONS IN BEECH AND MAPLE STANDS ALONG A NITROGEN DEPOSITION GRADIENT
A gradient of atmospheric nitrogen deposition exists across the northeastern United States due to the concentration of urban and industrial sources of nitrogen oxides in the southern and westernExpand
Regional nitrogen budgets and riverine N & P fluxes for the drainages to the North Atlantic Ocean: Natural and human influences
We present estimates of total nitrogen and total phosphorus fluxes in rivers to the North Atlantic Ocean from 14 regions in North America, South America, Europe, and Africa which collectivelyExpand
Nitrogen fixation: Anthropogenic enhancement‐environmental response
In the absence of human activities, biotic fixation is the primary source of reactive N, providing about 90–130 Tg N yr−1 (Tg = 1012 g) on the continents. Human activities have resulted in theExpand
Human contributions to terrestrial nitrogen flux
TLDR
The sources and fates of anthropogenic fixed nitrogen come together in the common pathways of the agricultural food chain and the topics covered in this article include the following. Expand
Atmospheric deposition of nutrients to the North Atlantic Basin.
Atmospheric chemical models are used to estimate the deposition rate of various inorganic oxides of nitrogen (NOy), reduced nitrogen species (NHx) and mineral dust to the North Atlantic Ocean (NAO).Expand
HUMAN ALTERATION OF THE GLOBAL NITROGEN CYCLE: SOURCES AND CONSEQUENCES
Nitrogen is a key element controlling the species composition, diversity, dynamics, and functioning of many terrestrial, freshwater, and marine ecosystems. Many of the original plant species livingExpand
...
1
2
3
4
5
...