Holland, Elisabeth A. and Guenther, Alex B. and Lee-Taylor, Julia and Bertman, S.B. and Carroll, M.A. and Shepson, P.B. and Sparks, J.P. (2005) U.S. nitrogen science plan focuses collaborative efforts. Eos, Transactions, American Geophysical Union, 86 (27). pp. 253-260. ISSN 0096-3941
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Abstract
Nitrogen is a major nutrient in terrestrial ecosystems and an important catalyst in tropospheric photochemistry. Over the last century human activities have dramatically increased inputs of reactive nitrogen (Nr, the combination of oxidized, reduced, and organically bound nitrogen) to the Earth system (Figure 1). Nitrogen cycle perturbations have compromised air quality and human health, acidified ecosystems, and degraded and eutrophied lakes and coastal estuaries [Vitousek et al., 1997a, 1997b; Rabalais, 2002; Howarth et al., 2003; Townsend et al., 2003; Galloway et al., 2004].Increased Nr affects global climate. Use of agricultural fertilizers such as ammonium nitrate leads to increased soil production of nitrous oxide (N2O), which has 320 times the global warming potential of carbon dioxide (CO2). Emission of nitrogen oxides (NOx = nitric oxide, NO + nitrogen dioxide, NO2) from fossil fuel burning leads to increases in tropospheric ozone, another greenhouse gas. Ozone is phytotoxic, and may reduce terrestrial CO2 sequestration. To predict the effects of nitrogen cycling changes under changing climatic conditions, there needs to be a better understanding of the global nitrogen budget.
| Item Type: | Journal Article |
|---|---|
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences S Agriculture > S Agriculture (General) |
| Divisions: | Pacific Centre for Environment and Sustainable Development (PACE-SD) |
| Depositing User: | Harmindar Kaur |
| Date Deposited: | 22 Jun 2023 02:47 |
| Last Modified: | 22 Jun 2023 02:47 |
| URI: | https://repository.usp.ac.fj/id/eprint/14031 |
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