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Yield and nitrogen accumulation and partitioning in winter wheat under elevated CO2: A 3-year free-air CO2 enrichment experiment

Author:
Han, Xue, Hao, Xingyu, Lam, Shu Kee, Wang, Heran, Li, Yingchun, Wheeler, Tim, Ju, Hui, Lin, Erda
Source:
Agriculture, ecosystems & environment 2015 v.209 pp. 132-137
ISSN:
0167-8809
Subject:
carbon dioxide, climate, combustion, deforestation, fertilizer rates, field experimentation, flowering, fossil fuels, free air carbon dioxide enrichment, grain yield, growing season, nitrogen, ripening, winter wheat, China
Abstract:
Fossil fuel combustion and deforestation have resulted in a rapid increase in atmospheric [CO2] since the 1950’s, and it will reach about 550μmolmol−1 in 2050. Field experiments were conducted at the Free-air CO2 Enrichment facility in Beijing, China. Winter wheat was grown to maturity under elevated [CO2] (550±17μmolmol−1) and ambient [CO2] (415±16μmolmol−1), with high nitrogen (N) supply (HN, 170kg Nha−1) and low nitrogen supply (LN, 100kg Nha−1) for three growing seasons from 2007 to 2010. Elevated [CO2] increased wheat grain yield by 11.4% across the three years. [CO2]-induced yield enhancements were 10.8% and 11.9% under low N and high N supply, respectively. Nitrogen accumulation under elevated [CO2] was increased by 12.9% and 9.2% at the half-way anthesis and ripening stage across three years, respectively. Winter wheat had higher nitrogen demand under elevated [CO2] than ambient [CO2], and grain yield had a stronger correlation with plant N uptake after anthesis than before anthesis at high [CO2]. Our results suggest that regulating on the N application rate and time, is likely important for sustainable grain production under future CO2 climate.
Agid:
5324399