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Effects of elevated carbon dioxide concentration on nitrous oxide emissions and nitrogen dynamics in a winter-wheat cropping system in northern China
Abstract A field experiment was conducted to explore the effects of elevated atmospheric carbon dioxide ($ CO_{2} $) (550 ± 17 μmol $ mol^{−1} $) on nitrous oxide ($ N_{2} $O) emissions and nitrogen (N) dynamics in a winter-wheat (Triticum aestivum L.) cropping system at the free-air $ CO_{2} $ enrichment (FACE) experimental facility in northern China. Compared to ambient $ CO_{2} $ (415 ± 16 μmol $ mol^{−1} $) condition, elevated $ CO_{2} $ increased $ N_{2} $O emissions by 21–36 % in the winter-wheat field. Under elevated $ CO_{2} $, soil total N at both 0–10 and 10–20 cm depths decreased at the ripening stage (RS) and the $ NH_{4} $+-N content also decreased at the RS and the grain filling stage (GFS), while soil $ NO_{3} $−-N content increased at the booting stage (BS) and RS. Elevated $ CO_{2} $ increased N concentrations in stem at the GFS, and leaf sheath and glumes at the RS, but decreased N concentration in spike at the GFS. Elevated $ CO_{2} $ increased N accumulations in leaf and stem at the GFS and in kernel, leaf sheath and glumes at the RS. The analysis shows that more $ N_{2} $O would be emitted from this system under the increasing atmospheric $ CO_{2} $ concentration with the same N fertilizer application rates. Since our results indicate that elevated $ CO_{2} $ could enhance plant N uptake and $ N_{2} $O emissions, more N is likely to be required by winter-wheat cropping systems to maintain current plant and soil N status.
Effects of elevated carbon dioxide concentration on nitrous oxide emissions and nitrogen dynamics in a winter-wheat cropping system in northern China
Abstract A field experiment was conducted to explore the effects of elevated atmospheric carbon dioxide ($ CO_{2} $) (550 ± 17 μmol $ mol^{−1} $) on nitrous oxide ($ N_{2} $O) emissions and nitrogen (N) dynamics in a winter-wheat (Triticum aestivum L.) cropping system at the free-air $ CO_{2} $ enrichment (FACE) experimental facility in northern China. Compared to ambient $ CO_{2} $ (415 ± 16 μmol $ mol^{−1} $) condition, elevated $ CO_{2} $ increased $ N_{2} $O emissions by 21–36 % in the winter-wheat field. Under elevated $ CO_{2} $, soil total N at both 0–10 and 10–20 cm depths decreased at the ripening stage (RS) and the $ NH_{4} $+-N content also decreased at the RS and the grain filling stage (GFS), while soil $ NO_{3} $−-N content increased at the booting stage (BS) and RS. Elevated $ CO_{2} $ increased N concentrations in stem at the GFS, and leaf sheath and glumes at the RS, but decreased N concentration in spike at the GFS. Elevated $ CO_{2} $ increased N accumulations in leaf and stem at the GFS and in kernel, leaf sheath and glumes at the RS. The analysis shows that more $ N_{2} $O would be emitted from this system under the increasing atmospheric $ CO_{2} $ concentration with the same N fertilizer application rates. Since our results indicate that elevated $ CO_{2} $ could enhance plant N uptake and $ N_{2} $O emissions, more N is likely to be required by winter-wheat cropping systems to maintain current plant and soil N status.
Effects of elevated carbon dioxide concentration on nitrous oxide emissions and nitrogen dynamics in a winter-wheat cropping system in northern China
Li, Yingchun (author) / Lin, Erda (author) / Han, Xue (author) / Peng, Zhengping (author) / Wang, Wen (author) / Hao, Xingyu (author) / Ju, Hui (author)
2013
Article (Journal)
Electronic Resource
English
BKL:
43.47
Globale Umweltprobleme
/
43.47$jGlobale Umweltprobleme
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