 |
| Titel |
Nitrous oxide emissions from drained and undrained loamy soils in Central France. |
| VerfasserIn |
Agnes Grossel, Bernard Nicoullaud, Philippe Rochette, Christophe Guimbaud, Michel Chartier, Catherine Hénault |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096065
|
| Publikation (Nr.) |
 EGU/EGU2014-11549.pdf |
|
|
|
|
|
| Zusammenfassung |
| Artificial drainage is extensively used in cropped areas to decrease soil hydromorphy. Soil
drainage class is considered as a possible factor controlling nitrous oxide (N2O) emissions
(Bouwman et al, 2002). Nevertheless, artificial drainage may have contrasting effects on N2O
emissions depending on climatic conditions (Colbourn et al, 1987; Venterea et al,
2008). By decreasing anoxic periods in soils, artificial drainage could reduce N2O
production by denitrification but it could also limit the reduction of N2O into N2. The
objective of this study was to assess the effect of drainage on N2O emissions and to
provide a better understanding of the control of emissions by soil factors in both
situations.
N2O emissions were measured in Central France on 4 tile-drained and 4 undrained loamy
plots, all located in a rural area of 10 km2. 2 drained and 2 undrained plots were studied from
December 2010 to June 2011 and 2 others drained and undrained plots were studied from
November 2012 to June 2013. Fluxes were measured monthly before spring fertilizations and
then weekly until the end of the measurement period. The closed chamber method (with 5
replicates per plot) was used and gas analysis was made by gas chromatography (ECD
detector) during the first year and by the SPIRIT QCL spectrometer (Guimbaud et al., 2011)
during the second year. Ancillary variables such as soil temperature, mineral nitrogen, water
filled pore space (WFPS) in the top layer and groundwater table level were also
measured.
Undrained soils presented much larger emissions and higher soil water content than
drained ones. WFPS ranged from 16 to 82.6% on drained plots and 14 to 100% on undrained
plots. On average, WFPS was 9% smaller on drained soils. The mean daily N2O flux on
drained soils (3.6 g N. N2O.ha-1.d-1) was significantly smaller (T test, p=0.003) than on
undrained ones (29.1 g N. N2O.ha-1.d-1). Significant emissions were measured in
nearly saturated conditions on undrained plots. The response of N2O emission
to soil WFPS was observed to be affected by the artificial drainage. This study
suggests that artificial drainage in the investigated site may have decreased N2O
emissions. In addition, different soil control functions have to be considered for
drained and undrained soils for model implementation related to soil N2O emission
processes.
Bibliography:
Bouwman, A.F., et al., N.H., 2002. Global Biogeochemical Cycles 16, 1058.
Colbourn, P., Harper, I.W., 198. Journal of Soil Science 38, 531–539.
Guimbaud, C., et al., 2011. Measurement Science and Technology 22, 075601.
Venterea, R.T et al., 2008. Proceedings of the Lamberton and Outreach Center Soil and
Water Management Field day
Acknowledgments : This work was supported by the Région CENTRE, the Fonds
Européen de Développement Régional (FEDER) and INRA through the SPATIOFLUX
Project, and by the Labex Voltaire (ANR-10-LABX-100-01). |
|
|
|
|
|
|