LiTongYuEtAl2008

Référence

Li, J., Tong, X., Yu, Q., Dong, Y., Peng, C. (2008) Micrometeorological measurements of nitrous oxide exchange above a cropland. Atmospheric Environment, 42(29):6992-7001. (Scopus )

Résumé

N 2O fluxes in a wheat/maize rotation system were measured using flux gradient methods combined with gas chromatograph (GC) technique. The mean precision of two repeated GC analyses for N 2O concentration achieved to 0.27-0.46 ppbv, which could resolve N 2O concentration differences in a low range of 0.39-0.65 ppbv. To maximize measurable N 2O concentration differences, gradient measurements were conducted only after fertilization or under low wind conditions. During observation period, N 2O flux ranged from -4.41 to 4.84 mgN 2O m -2 h -1 for maize field, and from -2.82 to 3.59 mgN 2O m -2 h -1 for wheat field. When gradient observation changed from two layers to four layers, the temporal variation of N 2O flux reduced but the mean value changed less. Many negative N 2O fluxes were found in maize and wheat fields even after fertilization. Nearly all of them were caused by negative N 2O concentration differences. During four days' observation in maize field, a mean N 2O flux of -0.75 mgN 2O m -2 h -1 was found in the daytime and could not be simply attributed to the temporal variation of N 2O flux. N 2O flux determined by the aerodynamic method (F a) and the Bowen ratio/energy balance method (F b) were in a good agreement and statistically significant. The ratio of F a to F b increased linearly with energy balance ratio (EBR) obtained by the aerodynamic method in the daytime when EBR is larger than 0.3. It is the first time to give a quantitative description for the impact of energy closure on N 2O flux, and show a possible way to improve the data quality under the condition of poor energy balance. © 2008 Elsevier Ltd. All rights reserved.

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@ARTICLE { LiTongYuEtAl2008,
    AUTHOR = { Li, J. and Tong, X. and Yu, Q. and Dong, Y. and Peng, C. },
    TITLE = { Micrometeorological measurements of nitrous oxide exchange above a cropland },
    JOURNAL = { Atmospheric Environment },
    YEAR = { 2008 },
    VOLUME = { 42 },
    PAGES = { 6992-7001 },
    NUMBER = { 29 },
    ABSTRACT = { N 2O fluxes in a wheat/maize rotation system were measured using flux gradient methods combined with gas chromatograph (GC) technique. The mean precision of two repeated GC analyses for N 2O concentration achieved to 0.27-0.46 ppbv, which could resolve N 2O concentration differences in a low range of 0.39-0.65 ppbv. To maximize measurable N 2O concentration differences, gradient measurements were conducted only after fertilization or under low wind conditions. During observation period, N 2O flux ranged from -4.41 to 4.84 mgN 2O m -2 h -1 for maize field, and from -2.82 to 3.59 mgN 2O m -2 h -1 for wheat field. When gradient observation changed from two layers to four layers, the temporal variation of N 2O flux reduced but the mean value changed less. Many negative N 2O fluxes were found in maize and wheat fields even after fertilization. Nearly all of them were caused by negative N 2O concentration differences. During four days' observation in maize field, a mean N 2O flux of -0.75 mgN 2O m -2 h -1 was found in the daytime and could not be simply attributed to the temporal variation of N 2O flux. N 2O flux determined by the aerodynamic method (F a) and the Bowen ratio/energy balance method (F b) were in a good agreement and statistically significant. The ratio of F a to F b increased linearly with energy balance ratio (EBR) obtained by the aerodynamic method in the daytime when EBR is larger than 0.3. It is the first time to give a quantitative description for the impact of energy closure on N 2O flux, and show a possible way to improve the data quality under the condition of poor energy balance. © 2008 Elsevier Ltd. All rights reserved. },
    COMMENT = { Cited By (since 1996): 1 Export Date: 14 May 2012 Source: Scopus CODEN: AENVE doi: 10.1016/j.atmosenv.2008.04.040 },
    ISSN = { 13522310 (ISSN) },
    KEYWORDS = { Aerodynamic method, Available N 2O concentration difference, Bowen ratio/energy balance method, Energy balance ratio, N 2O concentration gradient, N 2O flux, Summer maize, Winter wheat, Aerodynamic method, Available N <sub>2</sub>O concentration difference, Bowen ratio/energy balance method, Energy balance ratio, N <sub>2</sub>O concentration gradient, N <sub>2</sub>O flux, Summer maize, Winter wheat, Nitrogen oxides, nitrous oxide, aerodynamics, agricultural land, concentration (composition), crop rotation, data quality, energy balance, fertilizer application, gas chromatography, maize, micrometeorology, nitrous oxide, seasonal variation, temporal variation, wheat, accuracy, article, concentration (parameters), cropland, dynamics, energy balance, fertilization, gas chromatography, maize, meteorology, priority journal, seasonal variation, wheat, Triticum aestivum, Zea mays },
    OWNER = { Luc },
    TIMESTAMP = { 2012.05.14 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-51349149396&partnerID=40&md5=3f3a38489becdf1ca99ed01187e4a9a8 },
}

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