沈阳城区五种乔木树种的光合特性

Photosynthetic characteristics of five arbor species in Shenyang urban area

采用LI-6400红外气体分析仪和多元逐步回归统计分析方法,研究了沈阳城市森林中主要乔木树种—银中杨、旱柳、白榆、刺槐和山桃不同季节光合速率的日变化与季节变化.结果表明:各树种的光合速率日变化曲线多为单峰型;季节变化趋势均为夏季>秋季>春季;影响光合速率的主要因子是光合有效辐射、气孔导度和胞间CO2浓度.并建立了净光合速率与环境因子关系模型.

By using LI-6400 infrared gas analyzer, this paper studied the diurnal and seasonal variations of the photosynthetic rate of main arbor species （Populus alba × P, berolinensis, Salix matsudana , Ulmus pumila , Robinia pseudoacacia and Prunus davidiana ） in Shenyang urban area. The correlations between net photosynthetic rate and environmental factors （photosynthetic active radiation, temperature, and stomatal conductance） were assessed by multivariate regression analysis, and related equations were constructed. The results showed that for test arbor species, the diurnal variation of photosynthetic rate mainly presented a single peak curve, and the seasonal variation was in the order of summer 〉 autumn 〉 spring. The major factors affecting the photosynthetic rate were photosynthetic active radiation, stomatal conductance, and intercellular CO2 concentration.