CAJ | 학술논문

用LI-6400型光合测定系统,测定了北五味子Schisandra chinensis Baill叶片光合作用的日变化,结果表明,北五味子叶片净光合速率(Pn)呈双峰型变化.清晨随着日出,Pn随光照强度和温度的增加而增加,在11:00达到高峰,随后下降,到15:00时出现第2个高峰,但峰值比第1个的低.5:00-11:00及15:00-19:00的光合变化与光照强度和温度的变化趋势基本一致,11:00-14:00光合作用随光照强度和温度的增加而下降,出现了明显的光合"午休"现象.相关性分析表明,光合午休与中午高光强、高温和低湿有关.气孔导度(Gs)和蒸腾速率(Tr)也为双峰型曲线,Pn与Gs、Tr呈显著正相关,通过对胞间二氧化碳浓度的分析表明,气孔限制在北五味子叶片的"光合午休"中起了一定作用.
용LI-6400형광합측정계통,측정료북오미자Schisandra chinensis Baill협편광합작용적일변화,결과표명,북오미자협편정광합속솔(Pn)정쌍봉형변화.청신수착일출,Pn수광조강도화온도적증가이증가,재11:00체도고봉,수후하강,도15:00시출현제2개고봉,단봉치비제1개적저.5:00-11:00급15:00-19:00적광합변화여광조강도화온도적변화추세기본일치,11:00-14:00광합작용수광조강도화온도적증가이하강,출현료명현적광합"오휴"현상.상관성분석표명,광합오휴여중오고광강、고온화저습유관.기공도도(Gs)화증등속솔(Tr)야위쌍봉형곡선,Pn여Gs、Tr정현저정상관,통과대포간이양화탄농도적분석표명,기공한제재북오미자협편적"광합오휴"중기료일정작용.
Diurnal changes of net photosynthetic rate and relative factors in leaves of Schisandra chinensis Baill were measured by using LI-6400 portable photosynthesis system.Diurnal changes of net photosynthetic rate showed double-peak styles.The first maximum peak was measured at 11:00,the second-peak was measured at 15:00.Diurnal changes of net photosynthetic rate were consistent to the variation of light intensity at 5:00-11:00 and 11:00-19:00,respectively,and the photosynthesis had a"midday rest"for the dropping at 11:00-14:00.Stomatal conductance and transpiration rate were showed double-peak styles and the net photosynthetic rate were significantly positively correlated with stomatal conductanceand transpiration rate.Based on the tendency of changes in net photosynthetic rate,stomatal conductance and intercellular CO_2 concentration,the midday deperession in the S.chinensis Baill was speculated to be controlled by stomatal factors.