小麦旗叶光合生产力环境限制因子研究

Studies on the Limit Environment Factors of Flag Leaf Photosynthetic Productivity in Winter Wheat

对强光、高温环境条件下小麦旗叶光合生产力的限制因子及诊断方法进行了研究。通过连续测定小麦旗叶净光合速率及光合有效辐射、空气相对湿度、空气温度及CO2浓度变化,计算1日内旗叶Pn与这些主要环境因子变化的相关程度推断旗叶光合生产力的主要限制性因子。强光、高温天气条件下,制约旗叶光合生产力的主要限制性因子是PAR,其次是RH和空气CO2浓度。小麦旗叶光合日变化分为RH限制型、RH-CO2浓度限制型、PAR-RH限制型和PAR限制型。

In this article the limit Environment factors and diagnosis methods of flag leaf photosynthetic pro ductivity were studied in wheat ( Triticum aestivum L. ) in powerful radiation and high temperature conditions. Using continuous measuring the net photosynthetic rates and air relative humid (RH) and photosynthetic availability radiation (PAR) and air CO2 concentration and temperature (Tair) changing in the field, calculating the correlation coefficients between net photosynthetic rates and these environment factors changing in powerful radiation and high temperature conditions, the photosynthetic productivity limit factors of photosynthesis were determined. According to the correlation coefficients between net photosynthetic rates and air relative humid (RH) or photosynthetic availability radiation (PAR) or air CO2 concentration or temperature (Tair) changing in the field, the diurnal variation of photosynthesis can be divided RH restrict model,RH-CO2 restrict model, PAR-RH restrict model and PAR restrict model. It is important to study restrict photosynthesis factors and evaluate wheat varieties resistance to high temperature, powerful radiation conditions in the field.