Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8487698 | Agriculture, Ecosystems & Environment | 2015 | 6 Pages |
Abstract
Fossil fuel combustion and deforestation have resulted in a rapid increase in atmospheric [CO2] since the 1950's, and it will reach about 550 μmol molâ1 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 ± 17 μmol molâ1) and ambient [CO2] (415 ± 16 μmol molâ1), with high nitrogen (N) supply (HN, 170 kg N haâ1) and low nitrogen supply (LN, 100 kg N haâ1) 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.
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Authors
Xue Han, Xingyu Hao, Shu Kee Lam, Heran Wang, Yingchun Li, Tim Wheeler, Hui Ju, Erda Lin,