Light Intensity and Temperature on Photosynthesis and Respiration of Sumbady Plants (Dystaenia takesimana Kitagawa)

섬바디의 광합성(光合成)과 호흡(呼吸)에 미치는 광도(光度) 및 온도(溫度)의 영향(影響)

Effects of light intensity and temperature on photosynthesis and respiration of autogenous wild SUMBODY plants, Dystaenia takesimana, known as a prospective source of forage in Ulleung island, Korea, were investigated. Results were as follows : 1. Light saturation point at $20^{\circ}C$ was 34 to 38 klux and light compensation point was 4 to 6 klux. Apparent photosynthetic rate at light saturation was 9 to 12 mg $CO_2/dm^2/hr$. 2. Optimum temperature for photosynthesis was $20^{\circ}C$ and $Q_{10}$ values of two temperature ranges, 20 to $30^{\circ}C$ and 30 to $40^{\circ}C$, were 0.8 and 0.9 for photosynthesis, while $Q_{10}$ for respiration were 1.6 and 1.7. 3. Native plants sampled in area of higher altitude had a higher apparent photosynthtic rate at lower temperature and the plants sampled in area of mixed with bushes had lower a light compensation point. These rusults suggest that the Inland weather condition of Korea during spring and fall seasons might be. suitable for the SUMBODY growth but inadequate during summer.

울릉도자생(鬱陵島自生) 섬바디의 광합성(光合成) 및 호흡(呼吸)에 대(對)한 광도(光度) 및 온도(溫度)의 영향(影響)을 조사(調査)하였다. 1. 광합성(光合成)의 광포화점(光飽和点) 및 광보상점(光補償点)은 $20^{\circ}C$에서 각각(各各) 34~38klux와 4~6klux이고 광포화점(光飽和点)에서의 광합성속도(光合成速度)(호흡량(呼吸量)을 제(除)한)는 9~12mg $CO_2/dm^2/hr.$이었다. 2. 광합성적온(光合成適溫)은 $20^{\circ}C$이고 2온도범위($20{\sim}30^{\circ}C$, $30^{\circ}C{\sim}400^{\circ}C$)에서 광합성(光合成)의 $Q_{10}$치(値)는 0.8 및 0.9이고 호흡(呼吸)의 $Q_{10}$치(値)는 1.6 및 1.7이었다. 3. 자생지(自生地)의 환경조건(環境條件)에 적응(適應)하여 해발고도(海拔高度)가 높은 장소(場所)에서 자생(自生)한 식물본의 광보상점(光補償点)이 낮았다. 이상(以上)의 결과는 우리나라의 본과 가을이 섬바디생육(生育)에 적합(適合)함을 알 수 있고 하절기(夏節期)의 생육(生育)이 저조할 것임으로 다른 목초(牧草)와의 혼식재배(混植栽培)가 이상적(理想的)이라고 생각된다.