CAJ | 학술논문

对深山含笑、阔瓣含笑、金叶含笑和峨眉含笑幼树叶绿素荧光参数 Fv/Fm 在不同季节的日变化及其与光照(PAR)、气温(Ta)和大气相对湿度(RH)的相关性进行了测定和分析.结果表明,4种含笑幼树叶绿素荧光参数Fv/Fm在春季日变化小,各个时刻的测定值均大于0.75,荧光参数Fv/Fm在春季与其PAR、Ta和RH均无显著相关性.4种含笑叶绿素荧光参数 Fv/Fm 在夏季的日变化均呈先降后升的趋势,最低值(<0.75)出现在12:00~14:00之间.深山含笑和阔瓣含笑叶绿素荧光参数Fv/Fm与夏季的Ta和RH均分别呈显著负相关和显著正相关,但金叶含笑夏季叶绿素荧光参数Fv/Fm与PAR和Ta呈显著负相关.从叶绿素荧光参数Fv/Fm的日变化趋势和测定值看,深山含笑、阔瓣含笑和金叶含笑的光合机构在夏季12:00~14:00均受到可逆性胁迫影响.峨眉含笑夏季叶绿素荧光参数Fv/Fm与Ta和RH分别呈极显著负相关和极显著正相关,且Fv/Fm的测定值在一天中各个时刻均低于0.75,表明其光合机构在夏季受到不可逆性胁迫影响.峨眉含笑叶片叶绿素荧光参数 Fv/Fm 在秋季日变化呈先降后升的趋势,最低值(0.72)出现在14:00,且与RH呈显著正相关,其它3种含笑的Fv/Fm在秋季的日变化小,各个时刻的测定值均在0.75以上,且与其PAR、Ta和RH无显著相关性.4种含笑叶绿素荧光参数Fv/Fm在冬季的日变化均呈先升后降的趋势,且均与Ta呈显著正相关.从叶绿素荧光参数Fv/Fm的日变化趋势和测定值看,4种含笑的光合机构在冬季只受到了可逆性胁迫影响.
대심산함소、활판함소、금협함소화아미함소유수협록소형광삼수 Fv/Fm 재불동계절적일변화급기여광조(PAR)、기온(Ta)화대기상대습도(RH)적상관성진행료측정화분석.결과표명,4충함소유수협록소형광삼수Fv/Fm재춘계일변화소,각개시각적측정치균대우0.75,형광삼수Fv/Fm재춘계여기PAR、Ta화RH균무현저상관성.4충함소협록소형광삼수 Fv/Fm 재하계적일변화균정선강후승적추세,최저치(<0.75)출현재12:00~14:00지간.심산함소화활판함소협록소형광삼수Fv/Fm여하계적Ta화RH균분별정현저부상관화현저정상관,단금협함소하계협록소형광삼수Fv/Fm여PAR화Ta정현저부상관.종협록소형광삼수Fv/Fm적일변화추세화측정치간,심산함소、활판함소화금협함소적광합궤구재하계12:00~14:00균수도가역성협박영향.아미함소하계협록소형광삼수Fv/Fm여Ta화RH분별정겁현저부상관화겁현저정상관,차Fv/Fm적측정치재일천중각개시각균저우0.75,표명기광합궤구재하계수도불가역성협박영향.아미함소협편협록소형광삼수 Fv/Fm 재추계일변화정선강후승적추세,최저치(0.72)출현재14:00,차여RH정현저정상관,기타3충함소적Fv/Fm재추계적일변화소,각개시각적측정치균재0.75이상,차여기PAR、Ta화RH무현저상관성.4충함소협록소형광삼수Fv/Fm재동계적일변화균정선승후강적추세,차균여Ta정현저정상관.종협록소형광삼수Fv/Fm적일변화추세화측정치간,4충함소적광합궤구재동계지수도료가역성협박영향.
The diurnal changes of chlorophyll fluorescence parameter Fv/Fm of seedlings of Michelia mau-diae, Michelia platypetala, Michelia foveolata and Michelia wilsonii in different seasons and correlations between Fv/Fm values and photosynthetically active radiation(PAR), air temperature(Ta)and air humidity(RH)were studied in this paper. The diurnal change range of Fv/Fm of four michelia trees in spring was small and the values in a whole day were higher than 0.75. There was no significant correlation between the chlorophyll fluorescence parameter Fv/Fm of four michelia trees and PAR, Ta and RH in spring. The values of Fv/Fm in a wole day in summer showed a trend of descending first and then ascending and the lowest values(﹤0.75)appeared between 12:00 and 14:00. A negative relation was founded between Fv/Fm value of Michelia maudiae and Ta and RH, while a positive correlation between Fv/Fm value of Michelia platypetala and Ta and RH in summer;there was a significant negative correlation between Fv/Fm value of Michelia foveolata and PAR and Ta in summer. Based on the diurnal changes trend and the Fv/Fm value in a whole day, the effects of reversible stress on the photosynthetic tissues of Michelia maudiae, Michelia platypetala and Michelia foveolata were founded in summer from 12:00 to 14:00. The significant negative correlation and positive correlation between the values of Fv/Fm of Michelia wil-sonii and Ta and RH were also founded in summer, respectively. The values of Fv/Fm of Michelia wilsonii in a whole day in summer were below 0.75, indicating that there was irreversible stress effect on the photosynthetic tissues of Michelia wilsonii in summer. The diurnal change of Fv/Fm of Michelia wilsonii in autumn presented a trend of descending first and then ascending, and the lowest value (0.72)was at 14:00, and there was a significant postive correlation between the value of Fv/Fm and RH. The diurnal changes of Fv/Fm of the other three michelia trees in autumn were small, and the values were higher than 0.75 in a whole day. Meanwhile, no significant corre-lation between the values of Fv/Fm of three michelia trees mentioned above, and PAR, Ta and RH were founded from experimental results in autumn. The diurnal changes of Fv/Fm of four michelia trees in winter were ascend-ing at first and then descending, and significant postive correlation between the Fv/Fm and Ta was showed from the experimental results. The diurnal changes trend and the values of Fv/Fm in a whole day in winter indicated that the effects of stress on the photosynthetic tissues of four michelia trees were only reversible.