The Nitrogen Cascade

Human production of food and energy is the dominant continental process that breaks the triple bond in molecular nitrogen (N2) and creates reactive nitrogen (Nr) species. Circulation of anthropogenic Nr in Earth’s atmosphere, hydrosphere, and biosphere has a wide variety of consequences, which are m...

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Veröffentlicht in:Bioscience 2003-04, Vol.53 (4), p.341-356
Hauptverfasser: GALLOWAY, JAMES N, ABER, JOHN D, ERISMAN, JAN WILLEM, SEITZINGER, SYBIL P, HOWARTH, ROBERT W, COWLING, ELLIS B, COSBY, B. JACK
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container_end_page 356
container_issue 4
container_start_page 341
container_title Bioscience
container_volume 53
creator GALLOWAY, JAMES N
ABER, JOHN D
ERISMAN, JAN WILLEM
SEITZINGER, SYBIL P
HOWARTH, ROBERT W
COWLING, ELLIS B
COSBY, B. JACK
description Human production of food and energy is the dominant continental process that breaks the triple bond in molecular nitrogen (N2) and creates reactive nitrogen (Nr) species. Circulation of anthropogenic Nr in Earth’s atmosphere, hydrosphere, and biosphere has a wide variety of consequences, which are magnified with time as Nr moves along its biogeochemical pathway. The same atom of Nr can cause multiple effects in the atmosphere, in terrestrial ecosystems, in freshwater and marine systems, and on human health. We call this sequence of effects the nitrogen cascade. As the cascade progresses, the origin of Nr becomes unimportant. Reactive nitrogen does not cascade at the same rate through all environmental systems; some systems have the ability to accumulate Nr, which leads to lag times in the continuation of the cascade. These lags slow the cascade and result in Nr accumulation in certain reservoirs, which in turn can enhance the effects of Nr on that environment. The only way to eliminate Nr accumulation and stop the cascade is to convert Nr back to nonreactive N2.
doi_str_mv 10.1641/0006-3568(2003)053[0341:TNC]2.0.CO;2
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JACK</creatorcontrib><title>The Nitrogen Cascade</title><title>Bioscience</title><addtitle>BioScience</addtitle><description>Human production of food and energy is the dominant continental process that breaks the triple bond in molecular nitrogen (N2) and creates reactive nitrogen (Nr) species. Circulation of anthropogenic Nr in Earth’s atmosphere, hydrosphere, and biosphere has a wide variety of consequences, which are magnified with time as Nr moves along its biogeochemical pathway. The same atom of Nr can cause multiple effects in the atmosphere, in terrestrial ecosystems, in freshwater and marine systems, and on human health. We call this sequence of effects the nitrogen cascade. As the cascade progresses, the origin of Nr becomes unimportant. Reactive nitrogen does not cascade at the same rate through all environmental systems; some systems have the ability to accumulate Nr, which leads to lag times in the continuation of the cascade. 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source BioOne Complete; JSTOR Archive Collection A-Z Listing; Oxford University Press Journals All Titles (1996-Current)
subjects Agroecosystems
Anthropogenic factors
Aquatic ecosystems
Atmosphere
BIOLOGICAL ACCUMULATION
Biosphere
BUILDUP
CHEMICAL REACTIONS
DAMAGE
denitrification
Energy
Environment
ENVIRONMENTAL IMPACTS
ENVIRONMENTAL SCIENCES
EUTROPHICATION
fertilizer
FERTILIZERS
forest dieback
Forest ecosystems
FORESTS
Freshwater ecosystems
Fuels
Groundwater
Hydrosphere
Lentic systems
Marine ecosystems
Marine systems
Nitrogen
nitrogen cascade
NITROGEN COMPOUNDS
NITROGEN CYCLE
Nitrous oxide
Organic Chemistry
OVERVIEW ARTICLES
OZONE
Population Trends
Streams
Surface water
Terrestrial ecosystems
Wetlands
title The Nitrogen Cascade
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