In:
Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 89, No. 51 ( 2008-12-16), p. 529-529
Abstract:
Emissions of nitrous oxide (N 2 O), a potent greenhouse gas, tend to be underestimated by standard methods of quantifi cation provided by the Intergovernmental Panel on Climate Change (IPCC) [ IPCC , 2006], recent research suggests. Better quantification of agricultural N 2 O emissions improves greenhouse gas inventories, allows for better evaluation of the environmental impacts of different cropping systems, and increases the understanding of the nitrogen (N) cycle in general. Proper quantifi cation of N 2 O emissions is particularly important in the context of calculating net greenhouse gas emissions from biofuel cropping systems because these emissions offset the greenhouse gas benefits of displacing fossil fuel and can even lead to biofuel systems being a net greenhouse gas source [ Crutzen et al. , 2008]. The global warming potential of N 2 O is approximately 300 times that of carbon dioxide, and N 2 O emissions represent approximately 6% of the global anthropogenic greenhouse gas source [ IPCC , 2007]. N 2 O also contributes to stratospheric ozone destruction. N 2 O is produced in soils through the microbial processes of nitrifi cation and denitrification. Soil water content, temperature, texture, and carbon availability infl uence N 2 O emissions, but the strongest correlate is usually N inputs to the system, especially at large scales [ Stehfest and Bouwman , 2006]. In addition to direct emissions, N inputs to agricultural soils also contribute to N 2 O emissions indirectly [ IPCC , 2006] when nitrate that has leached or run off from soil is converted to N 2 O via aquatic denitrifi cation and when volatilized non‐N 2 O N‐oxides and ammonia are redeposited on soils and converted to N 2 O.
Type of Medium:
Online Resource
ISSN:
0096-3941
,
2324-9250
DOI:
10.1029/2008EO510001
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2008
detail.hit.zdb_id:
24845-9
detail.hit.zdb_id:
2118760-5
detail.hit.zdb_id:
240154-X
SSG:
16,13
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