沈阳城市森林主要绿化树种——丁香的光合特性研究

Photosynthetic characteristics of main urban forest species Syringa oblata in Shenyang.

应用LI 6 4 0 0红外气体分析仪对城市森林典型树种丁香不同季节光合作用的日变化规律进行研究 ,采用相关分析和多元逐步回归统计分析方法 ,得出净光合速率与光合有效辐射、气温、大气湿度、气孔导度等生理生态因子间的相关关系 .结果表明 ,丁香春季和夏季光合速率呈双峰曲线 ,秋季呈单峰曲线 .春季影响光合速率的主要因子为光合有效辐射和气孔导度 ;夏季影响光合速率的主要因子为气孔导度和光合有效辐射 ;秋季为气孔导度和胞间CO2 浓度 .

Using LI-6400 CO 2 gas analysis system and by the methods of correlation analysis and multinomial regression, this paper studied the diurnal changes of Syringa oblata photosynthesis during different seasons and assessed the correlation between net photosynthetic rate and environmental factors. The results indicated that the photosynthetic rate showed a double-peak curve in spring and summer and a single peak curve in autumn. The major factors affecting the photosynthetic rate were the solar radiation and stomatal conductance in spring and summer, and the stomatal conductance and intercellular CO 2 intensity in autumn. The related equation was also constructed in this paper.