窄叶短柱茶光合特性研究

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18.65μmol·m-2·s-1；通过光响应曲线拟合得知，其光补偿点为12μmol·m-2·s-1，光饱和点为500μmol·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。%The photosynthetic characteristics ofCamellia 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 18.65μmol·m-2·s-1; light compensation point of photosynthesis ofC. fluviatilisin 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.