红桤木光合与蒸腾速率对气象因子的响应

用Li-6400光合测定系统，对2年生红桤木在自然条件下的光合特性进行测定，探讨气象因子对光合特性的影响．结果表明：净光合速率在不同季节表现出明显不同的日变化规律，其中4月24日、10月10日和11月20日呈单峰型，而6月11日和8月9日呈双峰型．蒸腾速率的日变化均为单峰型．采用相关分析和多元逐步回归分析方法，得出净光合速率和蒸腾速率与光量子密度、大气CO2浓度、空气温度、相对湿度等气象因子间的相关关系，并建立了相应的影响因子回归方程．

Response of the Net Photosynthetic Rate and Transpiration Rate of Alnus rubra to Meteorological Factors

The photosynthetic properties of two-year-old seedlings of Alnus rubra were observed under natural conditions by means of Li-6400 Photosynthesis Analyzer to explore the influence of meteorological factors upon the seedlings＇ photosynthesis. The results indicated that there was difference in diurnal variation of the net photosynthetic rate, i. e. , the curve of diurnal variation of the net photosynthetic rate determined on April 24th, October 10^th and November 20^th was characterized by single-peak, while the curve of diurnal variation of the net photosynthetic rate determined on Junuary 11^th and August 9^th was characterized by double-peak. The diurnal variation of transpiration course of all the dates determined was one-peak curve. By means of correlation analysis and stepwise multiregression analysis, the correlation between net photosynthetic rate and transpiration rate, the correlation between net photosynthetic rate and meteorological factors including quanta flux density, CO2 concentration, air temperature and the relative humidity of atmosphere was analyzed, and the regressive equations were formulated.