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二氧化碳是植物进行光合作用的原料,它的浓度影响着光合强度。二氧化碳补偿点是光合作用的一种特定的二氧化碳浓度指标,指的是在植物净光合强度等于零时的环境中二氧化碳的浓度。大气中二氧化碳浓度一般约330PPm(0.033％),在植物生长繁茂,阳光充足的季节,田间空气中的二氧化碳浓度白天可降至200ppm,株间个别叶子附近甚至可降到100ppm。水稻单叶的二氧化碳补偿点是60～150ppm,其变化范围随光照强度而异。光弱,光合
Carbon dioxide is a plant photosynthesis of raw materials, its concentration affects the photosynthetic intensity. The point of carbon dioxide compensation is a specific indicator of carbon dioxide concentration in photosynthesis, which refers to the concentration of carbon dioxide in the environment at which the net photosynthetic intensity of the plant equals zero. The concentration of carbon dioxide in the atmosphere is generally about 330 ppm (0.033%). During the lush and sunny season, the concentration of carbon dioxide in the field air can be reduced to 200 ppm in the daytime and even to 100 ppm in the vicinity of individual leaves. The compensation point of single leaf carbon dioxide is 60 ~ 150ppm, the range of variation with the light intensity varies. Light, photosynthetic