油茶简化修剪光合特性研究

为了明确油茶简化修剪后树体光合特性，为油茶合理修剪和构建高光效树体结构提供依据，通过田间试验和光合因子观测，利用相关性分析、通径分析等统计学方法，对简化修剪后的油茶成年树光合日变化及相关影响因子进行了分析研究。结果表明：简化修剪后，油茶光合能力明显增强，净光合速率较对照明显提高；净光合速率与蒸腾速率、光照强度、空气温度、气孔导度、叶面水汽压亏失均呈极显著正相关，而与相对湿度、胞间CO2浓度呈显著负相关，各影响因子影响大小顺序是：蒸腾速率>胞间CO2浓度>光照强度>气孔导度>相对湿度；净光合速率与叶绿素含量的相关性因时间而异。研究证明，简化修剪能显著改善油茶树体光合性能，是油茶成年树树体调控的有效途径。

Photosynthetic Characteristics on Simplified Pruning in Camellia oleifera

In order to clarify photosynthetic characteristics on simplified pruning in Camellia oleifera and provide evidence for rational pruning and high photosynthetic efficiency tree body structure. The study used the field experiment and photosynthetic factors observation on the Camellia oleifera adult trees which analyzed them photosynthetic diurnal variation and its interrelated factors by statistical methods as correlation analysis and path analysis. The results displayed that the photosynthetic capacity could improved and the net photosynthetic rate were higher than control. Net photosynthetic rate was very significantly positive correlated with transpiration rate, light intensity, air temperature, stomatal conductance and vapor pressure deficit on leaf, and relative humidity was very significantly negative correlated with the intercellular CO2 concentration. The effect order was transpiration ratethe intercellular CO2 concentrationlight intensitystomatal conductance relative humidity. Correlation between diurnal variation and chlorophyll content was related to time. The study demonstrated that the Camellia oleifera tree body photosynthetic performance can markedly improve by simplified pruning, and simplified pruning was a effective way for regulation of adult Camellia oleifera tree.