If you maintain the forest, that is re-plant trees that die - which the forest will normally do itself once it is established, it is isn't temporarily.
It will be a buffer for CO2 that is bound in the forest as long as that forest stands, which could be for many, many millennia. Not everything will be released back to the atmosphere either, the forest will establish soil that will also bind a lot of carbon.
It will be a buffer for CO2 that is bound in the forest as long as that forest stands, which could be for many, many millennia. Not everything will be released back to the atmosphere either, the forest will establish soil that will also bind a lot of carbon.