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在大田自然条件下，研究了地膜覆盖栽培的甜菜光合、呼吸、蒸腾作用的基本特性和测试方法。结果表明：地膜覆盖栽培的甜菜不同叶位光合速率、呼吸速率、蒸腾强度明显不同，其中净光合强度、呼吸速率、蒸腾强度以倒8叶最大，变异系数最小，可以作为光合、呼吸、蒸腾作用测定的代表性部位。地膜覆盖栽培的甜菜光合、呼吸强度晴天日变化为双峰曲线，净光合强度（NPn）第一峰大于第二峰，上午大于下午，第一峰出现在13：00时左右，第二峰出现在17：00时左右。午休最严重时出现在14：00时。蒸腾强度（Tr）呈单峰曲线，峰值出现在15：00时左右。光合强度（Pn）、NPn值受光合有效辐射量（PAR）影响明显，呼吸强度（Rs）受PAR、温度（T）影响均很明显，Tr值与T、PAR间均达到极显著相关，但与T的相关系数更大。试验还对大田条件下地膜覆盖栽培甜菜的光合、蒸腾等作用的测试技术进行了探讨。
Under natural conditions in the field, the basic characteristics and testing methods of photosynthesis, respiration and transpiration of sugar beet mulched with plastic film mulching were studied. The results showed that photosynthetic rate, respiration rate and transpiration intensity of different leaf positions of mulch covered by mulching film were significantly different. The net photosynthetic rate, respiration rate and transpiration intensity were the largest with the inverted 8 leaves and the smallest coefficient of variation, which could be used as photosynthesis, respiration and transpiration Determination of the representative parts. The photosynthetic changes of photosynthetic sugarbeet mulched with plastic film mulching showed that the daily variation of respiration intensity was a bimodal curve, the first peak of net photosynthetic intensity (NPn) was larger than the second peak, the morning was greater than afternoon, the first peak appeared at about 13:00, and the second peak appeared Around 17:00. The most severe lunch break occurs at 14:00. Transpiration intensity (Tr) showed a single peak curve, the peak appeared around 15:00. The photosynthetic (Pn) and NPn values were significantly affected by PAR, and the respiration intensity (Rs) was significantly affected by PAR and temperature (T). The values of Tr and T and PAR all reached extremely significant correlation The correlation coefficient with T is greater. The test also discussed the testing technology of photosynthesis and transpiration of mulched beet covered with plastic film under field condition.