Journal article
Effect of elevated carbon dioxide on growth and nitrogen fixation of two soybean cultivars in northern China
SK Lam, X Hao, E Lin, X Han, R Norton, AR Mosier, S Seneweera, D Chen
Biology and Fertility of Soils | Published : 2012
Abstract
The effect of elevated carbon dioxide (CO 2) concentration on symbiotic nitrogen fixation in soybean under open-air conditions has not been reported. Two soybean cultivars (Glycine max (L.) Merr. cv. Zhonghuang 13 and cv. Zhonghuang 35) were grown to maturity under ambient (415 ± 16 μmol mol -1) and elevated (550 ± 17 μmol mol -1) [CO 2] at the free-air carbon dioxide enrichment experimental facility in northern China. Elevated [CO 2] increased above- and below-ground biomass by 16-18% and 11-20%, respectively, but had no significant effect on the tissue C/N ratio at maturity. Elevated [CO 2] increased the percentage of N derived from the atmosphere (%Ndfa, estimated by natural abundance) fr..
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Funding Acknowledgements
This work was supported by the Australian Greenhouse Office, the Australian Centre for Agricultural Research, and a Riady Scholarship. The authors wish to thank Xiaogang Dong, Ji Gao, Zongpeng Yang, and Qiubing Ye for the field assistance, and Jianlei Sun for assistance with the chemical analyses.