摘要
利用Li-6400便携式光合作用测定仪等仪器测试了壶瓶枣、赞皇枣和梨枣的光合速率与叶片构造特征。结果表明:赞皇枣光饱和点为1408.25μmol·m-2·s-1,光补偿点6.67μmol·m-2·s-1;梨枣光饱和点1387.66μmol·m-2·s-1,光补偿点10.4μmol·m-2·s-1;壶瓶枣光饱和点接近1500μmol·m-2·s-1。在较高光照强度时枣树蒸腾比率提高,叶片对水的利用率增高。三品种叶片下表皮平均气孔密度为70/mm2,且枣树单叶面积小,从光合特征及叶片结构方面解释了枣树喜光耐干旱的生理机制,为枣树优质丰产奠定了理论基础。
Photosynthetic rate and leaf structural features of Huping date, Zanhuang date and Li date Were tested using Li--6400 portable photosynthesis system. As the results showed： light saturation point（LSP） of Zanhuang date was 1 408.25 μmol·m^-2·s^-1 and light compensation point （LCP） was 6.67 μmol·m^-2·s^-1; LSP of Li date was 1 387.66μmol·m^-2·s^-1 and LCP was 10.4μmol·m^-2·s^-1,LSP of Huping date reached 1500μmol·m^-2·s^-1. Transpiration ratio and water utilization increased under higher light intensity. Average stomatal density of lower leaf epidermis was 70 /mm^2, which explained physiological mechanism from the aspects of photosynthetic characteristics and leaf structure why Chinese date was light-loving and drought-resistant, and provided theoretical basis for high quality and yield.
出处
《经济林研究》
2009年第2期10-15,共6页
Non-wood Forest Research
关键词
枣
光合作用
净光合速率
光饱和点
气孔
Chinese date
photosynthesis
net photosynthetic rate ,light saturation point ~stoma
