Forest carbon fixation is a kind of biological carbon fixation, which refers to the process that organisms absorb carbon dioxide into organisms through biochemical action (here refers to light and action), and synthesize organic matter to store it, so as to reduce the amount of carbon dioxide in the atmosphere. This is biological carbon fixation.

There are a lot of green plants in the forest, and the photosynthesis of these plants can absorb a lot of carbon dioxide every year and convert it into organic matter such as sugar. With the death and decay of plants, these organic substances can become carbon dioxide and re-enter the atmosphere. This is an important part of carbon cycle in biosphere and atmosphere.