Effect of elevated carbon dioxide on growth and nitrogen fixation of two soybean cultivars in northern China

文献类型： 外文期刊

第一作者： Lam, Shu Kee

作者： Lam, Shu Kee;Norton, Rob;Mosier, Arvin R.;Seneweera, Saman;Chen, Deli;Hao, Xingyu;Lin, Erda;Han, Xue;Hao, Xingyu;Lin, Erda;Han, Xue;Hao, Xingyu;Norton, Rob

作者机构：

关键词： Free-air carbon dioxide enrichment (FACE);Symbiotic nitrogen fixation;Natural abundance;Soybean cultivar

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN：

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收录情况： SCI

摘要： The effect of elevated carbon dioxide (CO2) 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 mu mol mol(-1)) and elevated (550 +/- 17 mu mol mol(-1)) [CO2] at the free-air carbon dioxide enrichment experimental facility in northern China. Elevated [CO2] 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 [CO2] increased the percentage of N derived from the atmosphere (%Ndfa, estimated by natural abundance) from 59% to 79% for Zhonghuang 13, and the amount of N fixed from 166 to 275 kg N ha(-1), but had no significant effect on either parameter for Zhonghuang 35. These results suggest that variation in N-2 fixation ability in response to elevated [CO2] should be used as key trait for selecting cultivars for future climate with respect to meeting the higher N demand driven by a carbon-rich atmosphere.

分类号： S15

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