초록
잣나무 구과(毬果)의 생장(生長)에 따른 광합성속도(光合成速度)($CO_2$ 재고정속도(再固定速度)), 암호흡속도(暗呼吸速度), $CO_2$, 수지(收支), 크로로필함량(含量) 등을 측정고찰(測定考察)하였으며, 그 결과(結果)를 요약(要約)하면 다음과 같다. 1. 구과(毬果)는 당년(當年)에 길이 3.6cm 직경(直徑) 2.4cm, 건중(乾重) 3.05g까지 자랐으며 2년(年)째에 길이 13.5cm, 직경(直徑) 9.3cm, 건중(乾重) 141.0g까지 자랐다. 2. 구과(毬果)의 암호흡(暗呼吸)에 대한 $CO_2$재고정율(再固定率)(광합성율(光合成率))은 전생장기간(全生長期間)동안 광포화(光飽和)에서 50%이하였다. 년간(年間)의 $CO_2$재고정율(再固定率)은 당년생구과(當年生毬果)가 7.3%, 2년(年)째 구과(毬果)가 8.7%였다. 3. 온도상승(溫度上昇)에 따른 구과(毬果)의 암호흡속도(暗呼吸速度)는 $25^{\circ}C$이하에서는 급격한 상승(上昇)을 보이나 $25^{\circ}C$이상에서는 느린 상승(上昇)을 나타냈다. 같은 온도(溫度)에서는 비생장기(非生長期)의 암호흡속도(暗呼吸速度)가 생장왕성기(生長旺盛期)보다 높았다. 4. 구과(毬果)의 암호흡속도(暗呼吸速度)와 $CO_2$재고정속도(再固定速度)는 당년생구과(當年生毬果)가 2년(年)째 구과(毬果)보다 현저히 높았다. 5. 수분후(受粉後) 완숙(完熟)될 때까지 구과(毬果)의 $CO_2$ 수지(收支)는 마이너스 값을 나타냈다. 년간(年間) 순호흡소비량(純呼吸消費量)은 당년생구과(當年生毬果)가 7.23 $CO_2g/cone$, 2년(年)째 구과(毬果)가 164.8 $CO_2g/cone$이었다. 6. 년간호흡소비효율(年間呼吸消費效率)(=순호흡소비량(純呼吸消費量)/건물중생산량(乾物重生産量))은 당년생구과(當年生毬果)가 1.61이고, 2년째 구과(毬果)가 0.81이었다. 7. 구과(毬果)의 크로로필 a, b의 총함량(總含量)은 전생장기간(全生長期間)을 통해 2mg/g dw 이하였고, Chl. a/b값은 2~3을 나타냈다.
The dark respiration, photosynthesis($CO_2$ refixation), $CO_2$ balance and chlorophyll content of 1st-year conelets and 2nd-year cones of Korean pine(Pinus koraiensis S.et.Z.) were investigated after pollination up to the end of maturation. The results obtained are as follows : 1. The growth of 1st-year conelet was 3.6cm in length. 2.4cm in diameter and 3.058 in dry weighs during the first year. The growth of 2nd-year mature cone was 13.5cm in length, 9.3cm in diameter and 141.0g in dry weight in the late of 2nd-year. 2. The refixation of carbon dioxide released from a cone by the dark respiration was less than 50 percent at light saturation through the growing period. The refixation of carbon dioxide released by dark respiration for one year was 7.3 percent in 1st-year conelets and 8.7 percent in 2nd-year cones. 3. The dark respiration rate of cones by increasing temperature was rapidly increased with increasing temperature up to $25^{\circ}C$. The dark respiration rate of cones was much higher in non-growing season than that in growing season at the same temperature. 4. The rates of dark respiration and $CO_2$ refixation, based on the dry weight, were much higher in 1st-year conelet than that in 2nd-year cone. 5. The $CO_2$ balance for a cone was negative from pollination to the end of maturation. The net dark respiration loss for a cone was 7.23g $CO_2$/year in 1st-year conelet and 164.8g $CO_2$/year in 2nd-year cone. 6. The respiratory loss efficiency for a cone(=$CH_2O$ weight calculated by net dark respiration/dry weight of cone) for one year was 1.61 in 1st-year conelet and 0.81 in 2nd-year cone for one year. 7. The total chlorophyll content of surface scale of the cone was lower than 2mg/g dw through the growing period, and chl. a/b ratio was 2 to 3.
(College of Forestry, Kwangweon University)
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