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| Titel |
Effects of nitrification inhibitors (DCD and DMPP) on nitrous oxide emission, crop yield and nitrogen uptake in a wheat–maize cropping system |
| VerfasserIn |
C. Liu, K. Wang, X. Zheng |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 4 ; Nr. 10, no. 4 (2013-04-11), S.2427-2437 |
| Datensatznummer |
250018194
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| Publikation (Nr.) |
 copernicus.org/bg-10-2427-2013.pdf |
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| Zusammenfassung |
| The application of nitrification inhibitors together with ammonium-based
fertilizers is proposed as a potent method to decrease nitrous oxide
(N2O) emission while promoting crop yield and nitrogen use efficiency in
fertilized agricultural fields. To evaluate the effects of nitrification
inhibitors, we conducted year-round measurements of N2O fluxes, yield,
aboveground biomass, plant carbon and nitrogen contents, soil inorganic
nitrogen and dissolved organic carbon contents and the main environmental
factors for urea (U), urea + dicyandiamide (DCD) and
urea + 3,4-dimethylpyrazol phosphate (DMPP) treatments in a wheat–maize
rotation field. The cumulative N2O emissions were calculated to be
4.49 ± 0.21, 2.93 ± 0.06 and
2.78 ± 0.16 kg N ha−1 yr−1 for the U, DCD and DMPP
treatments, respectively. Therefore, the DCD and DMPP treatments
significantly decreased the annual emissions by 35% and 38%,
respectively (p < 0.01). The variations of soil temperature, moisture and
inorganic nitrogen content regulated the seasonal fluctuation of N2O
emissions. When the emissions presented clearly temporal variations,
high-frequency measurements or optimized sampling schedule for intermittent
measurements would likely provide more accurate estimations of annual
cumulative emission and treatment effect. The application of nitrification
inhibitors significantly increased the soil inorganic nitrogen content (p
< 0.01); shifted the main soil inorganic nitrogen form from nitrate to
ammonium; and tended to increase the dissolved organic carbon content, crop
yield, aboveground biomass and nitrogen uptake by aboveground plant. The
results demonstrate the roles the nitrification inhibitors play in enhancing
yield and nitrogen use efficiency and reducing N2O emission from the
wheat–maize cropping system. |
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