Effects of elevated carbon dioxide concentration on nitrous oxide emissions and nitrogen dynamics in a winter-wheat cropping system in northern China

Yingchun Li, Erda Lin (), Xue Han, Zhengping Peng, Wen Wang, Xingyu Hao and Hui Ju

Mitigation and Adaptation Strategies for Global Change, 2015, vol. 20, issue 7, 1027-1040

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. Copyright Springer Science+Business Media Dordrecht 2015

Keywords: FACE experiment; Nitrous oxide; N dynamics; Phenological stages; Wheat-soil system (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1007/s11027-013-9513-8

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