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    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
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New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas: Report of the International Scope Nitrogen Project

New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas: Report of the International Scope Nitrogen Project

Townsend, Alan R.

Hardcover

ChemistryEnvironmental Studies

ISBN10: 0792357043
ISBN13: 9780792357049
Publisher: Springer Nature
Published: Jul 31 1999
Pages: 293
Weight: 1.33
Height: 0.69 Width: 6.14 Depth: 9.21
Language: English
Inputs of nitrogen to terrestrial and aquatic ecosystems have increased several-fold over the last one hundred and fifty years, with the steepest increases during the last four decades. The expansion of fertilizer manu- facture and use, the increase in fossil fuel combustion, the intensification of animal husbandry, and widespread cultivation of N2 fixing crops have all contributed to the dramatic increase in N inputs. The increase has been most rapid in Northern Hemisphere (NH) temperate ecosystems, but presently subtropical and tropical regions of Asia are also experiencing an explosive increase in N inputs to terrestrial ecosystems (W. Chameides, pers. comm.; Galloway et al. 1996). Projected increases in N deposition for these trop- ical and subtropical regions, with a high natural background of N inputs, exceed increases projected for temperate and arctic regions (Cleveland et al. submitted; Galloway et al. 1994; Holland & Lamarque 1997a). Compared to biological N fixation, N deposition is becoming a proportionately greater source of N to terrestrial and aquatic ecosystems worldwide (Vitousek et al. 1997). 6 The nitrogen contained in the atmosphere as N, 3. 9 * 10 Tg (Tg = 2 12 10 g), is the largest reservoir of N in the Earth system (Warneck 1988). However, this paper focuses on the nitrogen emissions and deposition that have been transformed from N2 into reactive forms that are biologically avail- able (e. g. Vitousek et al. 1997).

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