The Comparative Research On Photosynthetic Rate Of Three Kinds Of Camellia Plants

With the international advance Li-6400 portable photo synthesis, we studied photosynthetic characteristics, light response characteristics,CO2 response characteristics of Camellia oleifera Abel,C. polyodonta How ex Hu and C.compressa Chang et Wen ex Chang,and the Correlations in Photosynthetic rate between environment and physiolgical ecology parameters factors were also studied by SPSS.The Net photosynthetic rate of different positions, canopy layers and directions of leave were compared and the main results were obtained as follows:1. Diurnal change in net photosynthetic rate(Pn) in Camellia oleifera Abel, C. polyodonta How ex hu and C.compressa Change t Wen exchange was a "none-drop" bimodal curve.The first peak is more than the second,and there was obvious "midday rest" performance in the waving change.2. Diurnal change of stomatal conductivity (cond) are positively interrelated with net photosynthetic rate(Pn), while intercellular CO2 concentration(Ci) are negatively interrelated with net photosynthetic rate(Pn).Diurnal change of transpiration rate (tr)showed only one peak. The peak appeared at 13:00.3.Analytic results show that stomatal conductivity (cond)concentration(Ci) and photosynthetic active radiation(PAR) are main influencing factors of net photosynthetic rate in Camellia oleifera Abel;Transpiration rate (tr), stomatal conductivity (cond),intercellular CO2 concentration(Ci), photosynthetic active radiation(PAR) and Tleaf are main influencing factors of net photosynthetic rate in C. polyodonta How ex Hu;Stomatal conductivity (cond),intercellular CO2 concentration(Ci) and photosynthetic active radiation(PAR) are main influencing factors of net photosynthetic rate in C.compressa Chang et Wen ex Chang.4. Camellia oleifera Abel's light compensation points are at 48μmolm-2s-1,light saturation points at 1528μmolm-2s-1,CO2 compensation points are at 89μmolCO2mol-1, CO2 saturation points at 1255μmolCO2mol-1;C. polyodonta How ex Hu's light compensation points ark at 39μmolm-2s-1,light points at 1399μmolm-2s-1:CO2 compensation points are at 114μmolCO2mol-1, CO2 saturation points at 11μmolCO2mol-1;C.compressa Chang et Wen ex Chang's light compensation points are at 31μmolm-2s-1,light saturation points at 1286μmolm-2s-1;CO2 compensation points are at 102μmolCO2mol-1, CO2 saturation points at 1251μmolCO2mol-1:5.On the same branch,the net photosynthetic rate(Pn) of different leaf position had a waving change, The net photosynthetic rate(Pn) of middle leaves was more than the bottom and the top, the net photosynthetic rate(Pn) of the bottom sites' leaf was remarkable lower than the middle and top, from the different direction of the south,east,west and north,the net photosynthetic rate was from the maximize one to the minimize.6.The Camellia oleifera Abel's Pn under different inseminate density have remarkable difference, and the data of Camellia oleifera Abel in loose planting is better than compact planting's in important physiological and environment factors.