Home Forums Fish The Relation Between Aquatic Plant and Carbon Dioxide


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    Carbon dioxide is an important carbon source for promoting the photosynthesis of aquatic plants. The aquatic plants absorb carbon dioxide from the water as raw materials, and then carry out photosynthesis to synthesize glucose with water. The solubility of carbon dioxide will change with the change of PH value and temperature. At high temperatures, more carbon sources need to be provided to help water plants to photosynthesize. Under low temperature conditions, the metabolism of water plants will slow down, and the solubility of carbon dioxide will also increase with temperature. Decreasing the solubility increases, which requires us to have a control over the amount of carbon dioxide in the feeding.

    1. Why do we need carbon dioxide for Aquatic Plants?

    We know that assimilation is greater than dissimilation in order to show growth. Plants perform formal assimilation of light and action. Carbon dioxide is one of the main chemical factors for plants to perform light and action (except for N, P, K and trace elements). The amount of carbon dioxide dissolved in water is very small. If we provide sufficient light in the aquarium but do not give enough carbon dioxide, it will not achieve good results, so we need to add carbon dioxide in the water properly, so that it can be Plants grow faster, colors are brighter, and leaves are thicker, which requires sufficient carbon dioxide.  

    The content of carbon dioxide in the water should not be too much or too small. When carbon dioxide is lacking in the water body, the growth of fish will also have a certain effect, because the grass can also absorb carbonate and carbonic acid in the water, resulting in calcium carbonate in the water Wait for the precipitation of calcification. Causes the water to soften. It also causes an increase in PH.

    2. The Effect of Carbon Dioxide Concentration on Photosynthesis

    The average carbon dioxide concentration in natural water is about 5mg/L. But in fact, in the original waters of water plants, sometimes the carbon dioxide value in the water is only half or several times of this. In waters with good photosynthesis, carbon dioxide is below average. In the aquatic aquarium, although a lot of carbon dioxide is used by the aquatic plants, the fish in the aquarium will exhale carbon dioxide. Especially in aquariums with high breeding densities, such effects cannot be ignored. In such an aquarium with high carbon dioxide concentration, aquatic plants will make full use of photosynthesis, especially those that grow slowly, such as Ficus.

    3. The utilization rate of carbon dioxide of aquatic plants by different light waves

    The prerequisite for photosynthesis of aquatic plants is to have light. In addition to light, water and carbon dioxide are needed to synthesize them into sugars. The ratio of carbon dioxide in water used by aquatic plants in different light bands is different. Among them, the ratio of using carbon dioxide in the red band is the highest, followed by the purple band, followed by orange, indigo, blue, yellow, green and other light waves. Under red light, the ratio of water plants to carbon dioxide can reach 95%, but under green light, the ratio of water plants to carbon dioxide is only about 60%. Therefore, we can understand that the red light band is not only one of the best light energy areas for aquatic plants to conduct photosynthesis, but also the most effective area for aquatic plants to use carbon dioxide.

    4. How to increase the content of carbon dioxide in water?

    The step-by-step increase method is an effective method to steadily increase the concentration of carbon dioxide. If there are too many fish and shrimp, it is recommended to keep less. In the first place, more carbon dioxide can be injected, and secondly, the pollution of the water quality of the fish and shrimp excreta can be reduced.

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