设施栽培的果树,由于室内气体交换受到了限制,白天日出后果树的光合作用逐渐加强,二氧化碳浓度降低,影响了果树正常的光合作用;同时,由于棚室内的光照强度大大低于外界,光合同化能力也有所下降。试验证明,在密闭条件下,通过提高二氧化碳的浓度,可以弥补因光照不足而导致的光合 The fruit trees cultivated in the facilities are limited in indoor gas exchange. During the daytime, the photosynthesis of trees is gradually strengthened after the sunrise and the concentration of carbon dioxide is reduced, which affects the normal photosynthesis of the fruit trees. At the same time, the light intensity in the greenhouse is much lower than the outside light The contracting power has also declined. Experiments show that in confined conditions, by increasing the concentration of carbon dioxide, you can make up for lack of light due to photosynthesis