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利用德国WALZ公司生产的GFS-3000便携式光合作用测量系统,在川香9838和辐优838两个水稻品种乳熟期分别测定了功能叶片在不同CO2浓度下的光合作用速率对光强的响应,并通过直角双曲和修正的直角双曲方程进行模拟,得到各模式的相关参数.结果表明,(1)在各个CO2浓度条件下,各功能叶片的光合作用速率不同,倒一叶净光合速率大于倒二叶,倒三叶最小;(2)在CO2浓度相同的情况下,随着光强的增加,光合作用速率呈增加的趋势,但在光合速率(PAR)到达1 000μmol/(m2.s)以上时,增加值逐渐减小,甚至不变化;(3)通过模拟,得到的初始量子效率α的值在0.013～0.052 5之间,低于理论值,α的值也受到CO2浓度的影响,CO2浓度低,α的值一般也偏低.
Using the GFS-3000 portable photosynthesis measuring system produced by WALZ in Germany, the response of photosynthesis rate to light intensity of functional leaves at different CO2 concentrations was measured at the milky ripe stage of two rice varieties, Chuanxiang 9838 and Radix 838. The results showed that: (1) Under different CO2 concentrations, the photosynthetic rate of different functional leaves was different, and the net photosynthetic rate (2) Under the same CO2 concentration, photosynthesis rate increased with the increase of light intensity, but the photosynthetic rate (PAR) reached 1 000μmol / (m2. s), the added value decreases or does not even change. (3) The value of initial quantum efficiency α obtained by simulation is between 0.013 and 0.052 5, lower than the theoretical value, and the value of α is also affected by the concentration of CO2 Affect, CO2 concentration is low, the value of α is generally low.