Chinese Journal of Agrometeorology ›› 2012, Vol. 33 ›› Issue (02): 197-201.doi: 10.3969/j.issn.1000-6362.2012.02.007

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Effect of Free Air CO2 Enrichment on Nitrogen Absorption in Leaf and Head of Winter Wheat

 HAN  Xue, HAO  Xing-Yu, WANG  He-Ran, LI  Ying-Chun, LIN  Er-Da   

  1. 1Institute of Environment and Sustainable Development in Agriculture, CAAS/Key Laboratory of AgroEnvironment & ClimateChange, Ministry of Agriculture, Beijing100081, China; 2College of Agronomy, Shanxi Agricultural University, Taigu030801; 3College of Resource Environmental and Tourism, Capital Normal University, Beijing100048
  • Received:2011-12-22 Online:2012-05-20 Published:2012-08-30
  • About author: HAN Xue, HAO Xing-Yu, WANG He-Ran, LI Ying-Chun, LIN Er-Da

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Abstract: The effect of elevated CO2 and N supply on nitrogen content and uptake in flag leaf and head, the nitrate reductase activity (NRA) of flag leaf of winter wheat was studied at FACE (Free Air CO2 Enrichment) system. The results showed that elevated CO2 increased 7.59% nitrogen content and 16.3% nitrogen uptake in head at dough stage, respectively, and decreased 10.98% nitrogen content and 22.24% nitrate reductase activity in flag leaf. Nitrogen uptake and nitrate reductase activity did not change significantly under normal nitrogen input than low nitrogen input. The results indicated that elevated CO2 increased N demand in head, inhibited the assimilation of NO3ˉ. So, it was not the best option for meeting more nitrogen demand in head to increase nitrogen input under elevated CO2.

Key words: FACE (Free Air Carbon dioxide Enrichment), Winter wheat, Nitrogen content, Nitrogen uptake, Nitrate reductase activity

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