Abstract: The photosynthetic characteristics of Camellia fluviatilis were studied by LI -6400 (Li-Cor Inc, USA) portable photosynthesis system. The results showed that the curves of diurnal variation in Pn (net photosynthetic rate) had a peak at about 13:00 pm, and reached to 18.65 μmol·m^-2·s^-1; light compensation point of photosynthesis of C. fluviatilis in un-folding leaves was 12 µmol·m^-2·s^-1, light saturation point of photosynthesis was 500 µmol·m^-2·s^-1. The correlation analysis showed that: (1) The Pn of C. fluviatilis had extremely significant positive correlation (P≤0.01) with light intensity and air temperature, the correlation coefficients were 0.715 and 0.939 respectively; (2) There was significant negative correlation between Pn of C. fluviatilis and intercellular CO₂ concentration (P≤0.01), the correlation coefficient was -0.752; (3) The Pn of C. fluviatilis also had a negative correlation with the atmosphere CO₂ concentration (P≤0.05), correlation coefficient of which was -0.605.

Key words: Camellia fluviatilis, photosynthetic characteristics, diurnal variation, environmental factors

摘要： 用LI-6400型便携式光合作用测定系统对窄叶短柱茶Camellia fluviatilis的光合特性进行研究。结果表明：窄叶短柱茶净光合速率日变化呈单峰型曲线，峰值出现在13:00左右，为18.65 μmol·m^-2·s^-1；通过光响应曲线拟合得知，其光补偿点为12 μmol·m^-2·s^-1，光饱和点为500 μmol·m^-2·s^-1。相关性分析表明，窄叶短柱茶净光合速率与光强、大气温度具有极显著正相关性（P≤0.01），相关系数分别为0.715和0.939；与胞间CO₂浓度存在极显著负相关（P≤0.01）, 相关系数为-0.752；与大气CO₂浓度存在显著负相关性（P≤0.05)，相关系数为-0.605。

关键词: 窄叶短柱茶, 光合特性, 日变化, 环境因子