五种木兰科树种在南京地区冬春季节的光合特征  

Photosynthesis of five magnolia species in Nanjing City in winter and spring

作　　者：姜卫兵[1] 李刚[1] 翁忙玲[1] 姜武[1] 曹晶[1] 汪良驹[1] 

机构地区：[1]南京农业大学园艺学院,南京210095

出　　处：《应用生态学报》2007年第4期749-755,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30471181);江苏省综合性农业科技示范园资助项目(苏农计2003-50)

摘　　要：研究了自然分布于亚热带不同区域的5种木兰科常绿园林树种在南京地区的冬春季节光合作用和荧光变量的变化特征,并对影响净光合速率(Pn)的环境因子进行了灰色关联分析.结果表明:冬季5个树种的Pn和水分利用效率(WUE)日变化曲线与春季差异较大,Pn日积累值、表观量子效率(AQY)、羧化效率(CE)均低于春季或与春季相近,初始荧光(Fo)都显著高于春季,而PSⅡ最大光化学效率(Fv/Fm)、PSⅡ潜在光化学效率(Fv/Fo)、实际光化学效率(ΦPSⅡ)、有效光化学效率(Fv′/Fm′)、表观电子传递速率(ETR)、光化学猝灭系数(qP)和非光化学猝灭系数(NPQ)的总体趋势都低于春季.但供试树种间差异较大,其中主要分布于中亚热带(湘、赣、浙等地)的乐东拟单性木兰和阔瓣含笑在冬春季节的Pn日积分值、AQY、CE和光饱和点(LSP)均较高,光补偿点(LCP)较低,Fv/Fm、Fv/Fo、ΦPSⅡ、Fv′/Fm′、ETR和qP也都较高,表明其光合效能优良、光强利用范围较广;而主要分布于南亚热带(滇、湘、桂等地)的红花木莲和峨眉含笑的冬季光合效能较差,上述荧光变量也较低.灰色关联分析表明,冬季影响树种净光合速率最大的因子是大气温度(Ta),其次为光合有效辐射(PAR).The photosynthesis and fluorescence characteristics of five magnolia ornamental species naturally distributed in various subtropical areas were studied in Nanjing City in winter and spring. The results showed that the diurnal changes of net photosynthetic rate （Pn） and water use efficiency （WUE） of test species in winter were different from those in spring. The diurnal integral values of Pn, apparent quantum yield （AQY） and carboxylation efficiency （CE） were lower in winter than in spring, and the Fo was higher, while the Fv/Fm, Fv/Fo, ΦPSⅡ , Fv＇/Fm＇, ETR, qe and NPQ were lower in winter than in spring. The differences among the five species were remarkable, among which, Parakmeria lotungensis and Michelia platypetala mainly distributed in middle-subtropical area had higher diurnal integral values of Pn, AQY, CE and LSP, but lower value of LCP than other species in winter and spring, Their Fv/Fm, Fv/Fo, ΦPSⅡ , Fv＇/Fm＇, ETR, qv and NPQ were also higher, indicating that they had higher photosynthetic capacity and wider ecological ranges of light adaptability. Manglietia insignis and Michelia wilsonii mainly distributed in southern subtropical area had lower photosynthetic capacity, and their fluorescence parameters Grey correlation analysis showed the were Ta and PAR. main factors affecting the Pn of test were also lower in winter. magnolia species in winter

关 键 词：低温 光合 荧光 木兰科园林树种 

分 类 号：S792[农业科学—林木遗传育种]