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Net anthropogenic nitrogen inputs to watersheds and riverine N export to coastal waters: a brief overview
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2012 (English)In: Current Opinion in Environmental Sustainability, ISSN 1877-3435, E-ISSN 1877-3443, Vol. 4, no 2, 203-211 p.Article in journal (Refereed) Published
Abstract [en]

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 and aquatic ecosystems. For nitrogen (N), 'anthropogenic sources' include fertilizer, atmospheric N deposition, N fixation by plants (e.g. legumes), and the net import or export of N in human food and livestock feed, and are collectively referred to as Net Anthropogenic Nitrogen Inputs (NANI). Since the development of industrial N-fixing processes early in the 20th century, anthropogenic N inputs have grown to dominate the global N cycle, and have become the main sources of N in most watersheds affected by humans. It is now clear that riverine N transport from human-influenced watersheds to coastal waters is strongly related to NANI, as well as to hydroclimatic variables (precipitation, discharge, temperature) that can affect the amount of N retained in or removed from watersheds. Potential implications for increased N load from NANI include increased eutrophication, loss of species diversity and habitat, and growth of hypoxic areas ('dead zones') in coastal waters.

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2012. Vol. 4, no 2, 203-211 p.
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Environmental Sciences
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URN: urn:nbn:se:su:diva-80078DOI: 10.1016/j.cosust.2012.03.004ISI: 000304734500007OAI: oai:DiVA.org:su-80078DiVA: diva2:555992
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AuthorCount:5;

Available from: 2012-09-23 Created: 2012-09-12 Last updated: 2017-12-07Bibliographically approved

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Stockholm Resilience Centre
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