Book ChapterDOI
Critical Loads for Sulphur and Nitrogen
J. Nilsson
- pp 85-91
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A group of Nordic experts have tried to draw conclusions on critical loads for sulphur and nitrogen as discussed by the authors, defined as the highest load that will not cause chemical changes leading to long-term harmful effects on most sensitive ecological systems.Abstract:
A group of Nordic experts has tried to draw conclusions on critical loads for sulphur and nitrogen The critical load is defined as “The highest load that will not cause chemical changes leading to long-term harmful effects on most sensitive ecological systems”read more
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Journal ArticleDOI
Human alteration of the global nitrogen cycle: sources and consequences
Peter M. Vitousek,John D. Aber,Robert W. Howarth,Gene E. Likens,Pamela A. Matson,David W. Schindler,William H. Schlesinger,David Tilman +7 more
TL;DR: In this article, a review of available scientific evidence shows that human alterations of the nitrogen cycle have approximately doubled the rate of nitrogen input into the terrestrial nitrogen cycle, with these rates still increasing; increased concentrations of the potent greenhouse gas N 2O globally, and increased concentration of other oxides of nitrogen that drive the formation of photochemical smog over large regions of Earth.
Journal ArticleDOI
Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis.
Roland Bobbink,Kevin Hicks,James N. Galloway,Till Spranger,Rob Alkemade,Mike Ashmore,Mercedes M. C. Bustamante,Steve Cinderby,Eric A. Davidson,Frank Dentener,Bridget A. Emmett,Jan Willem Erisman,Mark E. Fenn,Frank S. Gilliam,Annika Nordin,Linda H. Pardo,W. de Vries +16 more
TL;DR: Ecosystems thought of as not N limited, such as tropical and subtropical systems, may be more vulnerable in the regeneration phase, in situations where heterogeneity in N availability is reduced by atmospheric N deposition, on sandy soils, or in montane areas.
Journal ArticleDOI
Nitrogen Saturation in Temperate Forest Ecosystems
John D. Aber,William H. McDowell,Knute J. Nadelhoffer,Alison H. Magill,G. M. Berntson,Mark Kamakea,Steven G. McNulty,William S. Currie,Lindsey E. Rustad,Ivan J. Fernandez +9 more
TL;DR: In the US, nitrogen deposition remains relatively constant in the northeastern United States and is increasing in the Southeast and the West (Fenn et al. as mentioned in this paper, 2003), while acid acid deposition is increasing.
Journal ArticleDOI
Visibility: Science and Regulation
TL;DR: Simpler models representing transport, limiting precursor pollutants, and gas-to-particle equilibrium should be used to understand where and when emission reductions will be effective, rather than large complex models that have insufficient input and validation measurements.
Journal ArticleDOI
Effects of atmospheric ammonia (NH3) on terrestrial vegetation: a review.
TL;DR: Current information suggests that a critical load of 5-10 kg ha (-1) year(-1) of total N deposition (both dry and wet deposition combined of all atmospheric N species) would protect the most vulnerable terrestrial ecosystems (heaths, bogs, cryptogams) and values of 10-20 kg ha-1 year-1 would protect forests, depending on soil conditions.