이산화탄소 농도 및 기온 상승이 현사시나무 삽목묘의 수분생리 특성에 미치는 영향
Effects of Elevated CO2 Concentration and Air Temperature on the Water Physiological Characters of Populus alba × P. glandulosa cutting
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초록
지구온난화에 대한 현사시나무의 적응반응을 구명하기 위해서, CO2농도 및 기온 상승된 조건에서 80일간 생장한 현사시나무 삽목묘의 수분생리특성을 조사하였다. 대조구는 기온이 주간 22℃, 야간 17℃이고, CO2농도는 주간 380ppm, 야간 400ppm이다. CO2농도 및 기온을 상승시킨 처리구는 기온이 주간 27℃, 야간 22℃이고, CO2농도는 주간 770ppm, 야간 790ppm이다. 처리구는 잎이 전개된 개수, 개엽의 평균면적, 전체 엽면적이 대조구에 비해서 낮은 값을 나타냈다. 그리고 처리구는 대조구에 비하여지상부의 건중량이 적고, 지하부의 건중량이 많았으며, 지하부에 대한 바이오매스의 분배율이 높았다. 이러한 결과로 CO2농도 및 기온이 상승되면 수분을 필요로 하는 동화기관의 면적이 감소되고, 수분을흡수하는 지하부에 대한 바이오매스 분배율이 높아짐을 확인할 수 있었다. 또한 처리구는 광도 및 CO2농도의 변화에 상관없이 기공전도도와 증산속도가 대조구에 비하여 낮게 유지되고 광합성에 대한 수분이용효율이 대조구보다 높게 나타냈다. 이 결과를 통하여 동화기관의 수분손실 억제반응과 수분이용효율이 증대반응을 확인할 수 있었다. 그리고 처리구는 절단한 잎이 건조공기에 노출되어도 상대함수율이대조구에 비하여 천천히 감소하는 경향을 나타내 동화기관의 수분손실 억제반응이 재확인되었다.
Abstract
This study was conducted to investigate the adaptative characteristics to the water relations ofPopulus alba×P. glandulosa cuttings in response to elevated CO2 concentration and airtemperature. The P. albal×P. glandulosa cuttings were grown in environment controlled growthchambers with two combinations of CO2 concentration and air temperature conditions: (i) 22℃+ CO2 380ppm(control) and (ii) 27℃ + CO2 770ppm(elevated). The hybrid poplars under theelevated treatment showed increase in ratios of shoot to root, compared with those under thecontrol condition. The leaf characters of hybrid poplars under the elevated treatment showed adecrease in the leaf number and area, compared with those under the ambient condition. Also,the hybrid poplars under the elevated treatment maintained lower stomatal conductance andslower transpiration rate. These results indicated that increased stomatal resistance of poplars under the elevated treatment allowed higher water use efficiency. These results suggested thatthe hybrid poplars under the elevated treatment had adaptive characteristics in water useefficiency and in photosynthetic tissue structures.
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