Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Effects of Elevated CO2 Concentration and Temperature on Physiological Characters of Liriodendron tulipifera

CO2농도 및 온도 상승이 백합나무의 생리적 특성에 미치는 영향

  • Lee, Ha-Soo (School of Ecology and Environmental System, Kyungpook National University) ;
  • Lee, Solji (School of Ecology and Environmental System, Kyungpook National University) ;
  • Lee, Jae-Cheon (Korea Forest Research Institute) ;
  • Kim, Ki Woo (School of Ecology and Environmental System, Kyungpook National University) ;
  • Kim, Pan-Gi (School of Ecology and Environmental System, Kyungpook National University)
  • 이하수 (경북대학교 생태환경시스템학부) ;
  • 이솔지 (경북대학교 생태환경시스템학부) ;
  • 이재천 (국립산림과학원) ;
  • 김기우 (경북대학교 생태환경시스템학부) ;
  • 김판기 (경북대학교 생태환경시스템학부)
  • Received : 2013.09.02
  • Accepted : 2013.09.09
  • Published : 2013.09.30
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Abstract

This study aimed to investigate the growth and physiological characters of Liriodendron tulipifera seedlings in responses to two different levels of elevated air temperature and $CO_2$ concentration. The seedlings were grown in environment-controlled growth chambers with two combinations of air temperature and $CO_2$ conditions: (1) $22^{\circ}C$ + ambient $CO_2$ $380{\mu}mol\;mol^{-1}$ and (2) $27^{\circ}C$ + $770{\mu}mol\;mol^{-1}$. Physiological characters such as growth, photosynthesis, and water use efficiency, were monitored for 85 days. The seedlings under the elevated treatment showed a greater amount of growth in tree height, compared with those under the control. Regarding the characteristics of assimilatory organs, the elevated treatment resulted in a greater amount of total leaf area, leaf unfolding, and dry weight per leaf area. No significant differences were found in photosynthesis capacity between the two treatments. The increase in water use efficiency with increased intercellular $CO_2$ partial pressure appeared overall lower in the seedling under the elevated treatment, compared with those under the control. The total leaf area of the seedlings under the elevated treatment was larger than that under the control, indicating a higher amount of photosynthesis. In addition, an increase of root growth was noted under the elevated treatment. A resistance mechanism of water stress may be attributed to a higher amount of organ growth as well as the tree height under the elevated treatment than the control.

지구온난화와 같은 기후변화에 대한 백합나무의 생리적 적응반응을 구명하기 위해서, $CO_2$ 농도 및 기온 상승이 백합나무의 생리특성에 미치는 영향을 조사하였다. 그 결과 $CO_2$ 농도 및 기온 상승에 의하여 백합나무의 동화기관을 비롯한 모든 기관의 생장이 촉진되었다. 그러나 광합성능력과 관련된 광합성색소의 함량, 광화학계 및 탄소고정계의 활성 등은 일반 대기조건에서 생장한 개체와 유사한 값을 나타내, 광합성능력의 변화가 없었음이 시사되었다. $CO_2$ 농도 및 기온 상승에 의한 증산속도의 상승으로 광합성에 대한 수분이용효율이 저하하였다. 그러나 측근 생장이 촉진되어 뿌리에 대한 동화기관의 비율이 낮아지는 반응이 나타나 수분흡수능력이 높아졌음을 확인하였다. 또한 잎이 두꺼워지고 치밀해지는 형태적 변화가 나타나고, 수분 손실에 대한 잎의 저항능력이 증대되었음이 확인되었다. 이러한 결과로 $CO_2$ 농도 및 기온 상승에 의하여 백합나무의 수분 스트레스에 대한 저항능력이 증대됨을 알 수 있다.

Keywords

References

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