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Laboratory studies of potentially important atmospheric processes involving oxides of nitrogenEstupiñán, Edgar G. 08 1900 (has links)
No description available.
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Factors affecting nitric oxide and nitrous oxide emissions from grazed pasture urine patches under New Zealand conditions : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Lincoln University /Khan, Shabana. January 2009 (has links)
Thesis (Ph. D.) -- Lincoln University, 2009. / Also available via the World Wide Web.
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Relationships between 30% normoxic nitrous oxide breathing, core temperature and exercise ventilation /Hall, Amanda, January 2003 (has links)
Thesis (M.Phys.Ed.)--Memorial University of Newfoundland, 2004. / Includes bibliographical references.
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N2O emissions from wheat agro-ecosystems under elevated atmospheric CO2Weber, Marie Aimee. January 1997 (has links) (PDF)
Thesis (M.S. - Soil, Water, and Environmental Science)--University of Arizona. / Includes bibliographical references (leaves 60-62).
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Enrichment of ¹⁵N and ¹⁸O in stratospheric nitrous oxide : observations, experimental results, and implications /Rahn, Thomas A., January 1998 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.
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LIF instrument development, in situ measurement at South Pole and 1D air-snowpack modeling of atmospheric nitrous acid (HONO)Liao, Wei. January 2008 (has links)
Thesis (M. S.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2008. / Committee Chair: David Tan; Committee Member: Greg Huey; Committee Member: Marc Stieglitz; Committee Member: Paul Wine; Committee Member: Robert Black.
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Carbon dioxide and nitrous oxide production from corn and soybean agroecosystemsSey, Benjamin Kweku. January 2006 (has links)
No description available.
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Earthworm-microbial interactions influence carbon dioxide and nitrous oxide fluxes from agricultural soilsSperatti, Alicia B. January 2007 (has links)
No description available.
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Carbon dioxide and nitrous oxide production from corn and soybean agroecosystemsSey, Benjamin Kweku. January 2006 (has links)
Globally, an estimated 25% of the CO2 and 90% of the N2O is believed to come from agroecosystems. The objective of this study was to investigate the dynamics of the below-ground CO 2 and N2O concentrations and efflux in corn and soybean systems. In our field study, changes in the below-ground concentrations of CO 2 and N2O were closely related to seasonal changes in soil moisture, with the first two months of the growing season being particularly critical to the production of these gases. Tillage significantly increased CO2 content in the soil profile, however, this effect was greater in the soybean plots than in the corn plots. In our greenhouse studies, an average of about 79% of the soil respiration in corn came from rhizosphere respiration, compared to an estimated 58% in the case of soybean. Specific rhizosphere respiration was significantly higher in soybean (0.29 mg C g -1 root h-1) than corn (0.09 mg C g-1 root h-1), which supports previous observations made with regards to slower-growing plants (e.g. soybean) having relatively higher root respiration than faster growing plants. We observed a nonsignificant difference between N2O efflux in the soybean-planted soil and unplanted bulk soil, which is in contrast to the perception that legumes could stimulate more N 2O production from the soil by increasing the N pool through N 2 fixation. While corn had the greatest uptake of fertilizer N, N 2O efflux in corn pots was higher (2.84 mug N pot-1 h-1) than the soybean pots (0.06 mug N pot-1 h-1). In the laboratory setting, denitrification in the microaggregates proceeded at about 4.4 to 39.6 times higher rate than in large macroaggregates, small macroaggregates or the bulk soil, and showed the greatest response to high moisture levels (80% WFPS).
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Earthworm-microbial interactions influence carbon dioxide and nitrous oxide fluxes from agricultural soilsSperatti, Alicia B. January 2007 (has links)
Earthworms are well known to increase decomposition of organic matter and release of plant available nutrients. They can also increase CO 2 and N2O fluxes from the soil by stimulating respiration, denitrification, and nitrification caused by soil microorganisms. The objective of this thesis was to examine the influence of different earthworm species and population numbers on CO2 and N2O fluxes from a corn agroecosystem. In the field study, earthworm treatments had a significant effect on CO2 fluxes, but there was no difference between CO 2 fluxes from the two species (Lumbricus terrestris L., Aporrectodea caliginosa Savigny) or from the two population levels (1x and 2x the naturally-occuring population). Also, the earthworm treatments had no significant effect on N2O fluxes. Since all treatments contained mixed species and similar population levels at the end of the study, it is likely that CO2 and N2O fluxes in the field were affected more by soil temperature and moisture fluctuations than by the earthworm treatments. The study was repeated in laboratory microcosms under environmental control. Again, earthworm treatments had a significant effect on CO2 fluxes, but not on N2O fluxes. Interestingly, the N 2O fluxes from microcosms containing L. terrestris came solely from denitrification, while the N2O fluxes from A. caliginosa microcosms were produced mostly by nitrification. It is not known why these species stimulate different groups of microorganisms that can produce N2O, and this remains to be investigated.
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