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当光强达到1700μmolphotonm~-2s~-1，叶温超过35℃的晴天中午，水稻可产生明显的午休．通过光合午休过程中各因素与光合速率的相关性分析，采用R～2（决定系数）决定最佳回归分析所建立的复合回归模式，以此数学模型绘制响应曲面图．本文由数学分析，证实了午休过程中光合速率下降的主要限制因子是气孔导度；并分析了光合午休过程中，气孔导度与其它各因素的交互作用对光合速率的影响，揭示午休是在干热条件下，气孔导度减小，胞间CO_2浓度明显降低，光合原料短缺导致的光合速率下降．
When the light intensity reached 1700μmolphotonm ~ -2s ~ -1, leaf temperature over 35 ℃ sunny noon, rice can produce significant lunch break. Through the correlation analysis of photosynthesis rate and photosynthetic rate during midday depression, the regression model established by optimal regression analysis was determined by R ~ 2 (coefficient of determination), and the response surface map was drawn based on the mathematical model. In this paper, mathematical analysis shows that the main limiting factor of photosynthetic rate decline during lunch break is stomatal conductance. The effects of the interaction between stomatal conductance and other factors on photosynthetic rate during midday depression were analyzed. Under dry and hot conditions, the stomatal conductance decreased, the intercellular CO 2 concentration decreased significantly, and the photosynthetic rate caused by the shortage of photosynthetic materials decreased.