한국농림기상학회지, 제 15권 제3호(2013) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 15, No. 3, (2013), pp. 145~152
DOI: 10.5532/KJAFM.2013.15.3.145
ⓒ Author(s) 2014. CC Attribution 3.0 License.


CO2농도 및 온도 상승이 백합나무의 생리적 특성에 미치는 영향

이하수(1), 이솔지(1), 이재천(2), 김기우(1), 김판기(1)
(1)경북대학교 생태환경시스템학부, (2)국립산림과학원

(2013년 09월 02일 접수; 2013년 09월 05일 수정; 2013년 09월 09일 수락)

Effects of Elevated CO2 Concentration and Temperature on
Physiological Characters of Liriodendron tulipifera

Ha-Soo Lee(1), Solji Lee(1), Jae-Cheon Lee(2), Ki Woo Kim(1), Pan-Gi Kim(1)
(1)School of Ecology and Environmental System, Kyungpook National University, Sangju 742-711, Korea
(2)Korea Forest Research Institute, Suwon 441-350, Korea

(Received September 02, 2013; Revised September 05, 2013; Accepted September 09, 2013)

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 CO2 concentration. The seedlings were grown in environment-controlled growth chambers with two combinations of air temperature and CO2 conditions: (1) 22oC< + ambient CO2 380 μmol mol-1 and (2) 27oC + 770 μmol 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 CO2 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.

Keyword: Carbon dioxide enrichment, Photosynthesis, Water use efficiency, Global warming

MAIN

적요

지구온난화와 같은 기후변화에 대한 백합나무의 생리적 적응반응을 구명하기 위해서, CO2 농도 및 기온상승이 백합나무의 생리특성에 미치는 영향을 조사하였다. 그 결과 CO2 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. CO2 농도 및 기온상승에 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, 수분손실에 대한 잎의 저항능력이 증대되었음이 확인되었다. 이러한 결과로 CO2 농도 및 기온 상승에 의하여 백합나무의 수분 스트레스에 대한 저항능력이 증대됨을 알 수 있다.

감사의 글

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