Biomass Production and N Uptake of Chinese Cabbages as Affected by N Rates under Elevated Atmospheric CO2 and Temperature

다국어 초록 (Multilingual Abstract)

To investigate the effects of elevated CO2 and temperature on plant biomass production and N uptake, Chinese cabbages (Brassica campestris cv. Jangmi) were grown at two rates of N (350 and 700 mgkg-1) under contrasting atmospheric CO2 (360 and 650 mmolmol-1) in combination with current ambient or elevated (ambient +5C) temperature for 70 days. Temperature, CO2, and N rate significantly affected dry-mass of Chinese cabbage. Elevated CO2 suppressed dry-mass accumulation of the plants receiving N at 350 mgkg-1 irrespective of temperature, but the degree of suppression was significantly reduced for the plants receiving N at 700 mgkg-1 only when coupled with elevated temperature. Temperature and CO2 significantly affected N content of Chinese cabbages, while N rate did not. Irrespective of temperature and CO2 levels, N uptake efficiency was reduced with increasing N rates. However, N uptake efficiency of the plants receiving high N rates grown at elevated-temperature regimes increased at elevated CO2 levels whereas that of their counterparts grown at ambient-temperature regimes decreased, suggesting that the N rate of 700 mgkg-1 would be insufficient to ensure optimum growth of Chinese cabbages under elevated temperature and CO2. Our results suggested that an alternative N fertilization for Chinese cabbages should be tested if a doubling of atmospheric CO2 level leads to elevated temperatures.

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