摘要
利用GFS-3000便携式光合-荧光测量系统测定鲁北冬枣叶片的光合作用日变化和光响应特征。结果表明:鲁北冬枣叶片的净光合速率日变化曲线为"双峰"型,具有明显的光合"午休"现象;净光合速率与气孔导度呈显著正相关,而气孔限制值与胞间CO2浓度呈显著负相关,午间光合速率降低主要是受气孔限制因素影响;鲁北冬枣的光补偿点为16.0μmol/(m2.s),光饱和点为1 500.0μmol/(m2.s),表观量子效率0.058,属喜阳植物;其CO2补偿点为29.54μmol/mol,饱和点为1 352.5μmol/mol时,羧化效率为0.054。
Diurnal variations and light response of photosynthesis in leaves of Zizyphus jujuba var. inermis ‘Lu- bei-Dongzao＇ were measured with GFS -3000 portable photosynthesis system. The results showed that the diurnal variation of net photosynthetic rate （Pn） exhibited dual-peak curves with midday depression, showing obvious ＇midday depression＇ phenomenon. The significant positive correlation was found between the net photosynthesis rate and stomatal conductance; but the stoma limit ratio was negatively correlated to intercellular CO2 concentra- tion. It was indicated that the photosynthesis decline during midday time was principally influenced by stomatal conductance limitation. The light compensation point （LCP） and light saturation point （LSP） of the target species were 16.0μmol/（m2 · s） and 1 500.0 μmol/（m2·s） individually, its apparent quantum yield （AQY） was 0. 058, indicating that Zizyphus jujuba var. inermis ＇ Lubei-Dongzao＇ was a heliophilous plant species, The results showed that its carbon dioxide compensation point （CCP） and saturation point （CSP） was 29.54 μmol/mol and 1 352.5 μmol/mol respectively, and its carboxylation efficiency （CE） was 0. 054.
出处
《西南林学院学报》
CAS
2010年第1期34-37,41,共5页
Journal of Southwest Forestry College
基金
国家科技成果转化重点项目(2006GB2C200113)资助
浙江省科学技术重大项目(021102537)资助
关键词
鲁北冬枣
光合作用
日变化
光响应
光合午休
Zizyphus jujuba vat. inermis ‘ Lubei-Dongzao＇
photosynthesis
diurnal variations
light re-sponse
midday depression of photosynthesis
