关键词: 金霉素, 蚯蚓, 土壤污染, 抗氧化酶, 生态毒性效应

Abstract: Four typical models of photosynthesis light response curve (rectangular hyperbolic model, nonrectangular hyperbolic model, exponential function, and modified rectangular hyperbolic model) were adopted to fit the photosynthesis light response curves of four rice varieties (02428, Ganxin688, JR8892-1, and JR8892-2). All the four models could well fit the photosynthesis light response curves of the four rice varieties (R₂>0.99), but only the modified rectangular hyperbolic model could well fit the light response curves of photoinhibition part, and directly calculate their saturation irradiance (I_sat). The rectangular and nonrectangular hyperbolic models overestimated the P_{n max}, while the exponential function and the modified rectangular hyperbolic model presented more realistic values. The I_sat values estimated by rectangular hyperbolic model, non-rectangular hyperbolic model, and exponential function were significantly different from the measured data. The I_sat values of the rice varieties except JR8892-1 estimated by the rectangular hyperbolic model, nonrectangular hyperbolic model, and exponential function were lower than the measured data, and only the I_sat values estimated by the modified rectangular hyperbolic model were consistent with the measured data. The estimated values of the low irradiance part parameters such as light compensation point (I_c) and dark respiration (R_d) by the modified rectangular hyperbolic model were most close to the measured values. As for the photosynthesis characteristics, the I_sat and P_{n max} values of JR8892-1 were obviously higher than those of the variety 02428 with high photosynthetic efficiency. The JR8892-2 at tillering stage also presented higher I_sat and P_{n max}, while the super rice Ganxin688 presented a lower R_d, with a lower consumption of photosynthetic products than the other rice varieties.