Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2594-2602.DOI: 10.3969/j.issn.1004-1524.2022.12.02

• Crop Science • Previous Articles     Next Articles

Effects of different CO2 concentration and nitrogen rates on photosynthesis and growth of winter wheat

WU Hao(), ZHANG Xuesong(), WANG Dan   

  1. School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210000, China
  • Received:2021-09-26 Online:2022-12-25 Published:2022-12-26
  • Contact: ZHANG Xuesong

Abstract:

In order to elucidate the interactive effects of different nitrogen rates on photosynthesis, biomass accumulation and yield of winter wheat under the elevated CO2 concentration, the winter wheat variety Ningmai 13 was selected as the test material, and an experiment with different CO2 concentrations (C, ambient CO2 concentration; T, higher CO2 concentration, ambient CO2 concentration+200 μmol·mol-1) and different N levels (LN, low nitrogen, 90 kg·hm-2; HN, high nitrogen, 240 kg·hm-2) was conducted, and the photosynthetic characteristics, carbon and nitrogen content in leaves, biomass and yield of winter wheat at different growth stages under different treatments were measured. It was shown that the higher CO2 concentration increased the net photosynthetic rate of winter wheat by 78.4% under the low nitrogen level and 77.2% under the high nitrogen level. At the flowering stage and the filling stage, high nitrogen level increased the above-ground biomass accumulation of winter wheat. Among all the treatments, the yield of C-LN was the smallest, yet the yield of T-HN was the highest, and the difference between them was significant (P<0.05). Therefore, it was inferred that under the elevated CO2 concentration in the future, the biomass accumulation and yield of winter wheat could be increased by increasing the application rate of nitrogen fertilizer.

Key words: winter wheat, high CO2 concentration, nitrogen application level, photosynthetic physiology, biomass, yield

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