【作者】 何一明；

【导师】 吕芳德；

【作者基本信息】 中南林业科技大学 ， 森林培育， 2008， 硕士

【摘要】 利用Li-6400便携式光合作用测定仪,研究了普通油茶、多齿红山茶、扁果红山茶田间条件下的光合特性,光响应、CO2响应；并用spss软件对普通油茶、多齿红山茶、扁果红山茶光合速率与生理、环境因子进行相关性分析；同时对三种山茶属植物的的枝条不同叶位、不同冠层、不同方位、不同栽植密度的叶片光合速率进行了比较,结果表明：1.普通油茶、多齿红山茶、扁果红山茶光合速率日变化均为双峰曲线,首峰值大于次峰值,且有明显的“午休”现象。2.气孔导度的变化趋势基本与净光合速率的变化趋势成正相关,而胞间CO2浓度的日变化与净光合速率成负相关,蒸腾速率的日变化基本为单峰曲线,最高值多出现在13点前后。3.影响普通油茶日变化的主要因子是气孔导度、胞间CO2浓度以及光合有效辐射；影响多齿红山茶日变化的主要因子是蒸腾速率、气孔导度、胞间CO2浓度、光合有效辐射以及气温；影响扁果红山茶日变化的主要因子是气孔导度、胞间CO2浓度以及光合有效辐射。4.普通油茶的光补偿点48μmolm-2s-1,光饱和点1528μmolm-2s-1;CO2补偿点89μmolCO2mol-1,CO2饱和点1255μmolC02mol-1。多齿红山茶的光补偿点39μmolm-2s-1,光饱和点1399μmolm-2s-1,CO2补偿点114μmolCO2mol-1,CO2饱和点1240μmolCO2mol-1。扁果红山茶的光补偿点31μmolm-2s-1,光饱和点1286μmolm-2s-1;CO2补偿点102μmolC02mol-1,CO2饱和点1251μmolC02mol-1。5.三种山茶属植物枝条不同叶位的叶片其Pn变化有一定规律,中部成龄叶Pn最大,基部和梢部叶片Pn降低；树冠下层的叶片Pn值显著地低于中层和上层；树体不同方位(东、南、西、北四个方向的外围)的叶片Pn大小依次为南面>东面>西面>北面。6.不同栽植密度条件下的普通油茶的光合速率有着显著性的差异。在影响普通油茶净光合速率的关键因子中,疏植条件下的普通油茶的各项数据均要优于密植条件下的普通油茶。更多还原

【Abstract】 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.更多还原