It's worth noting here that the root system of the tree remains and also that different trees/plantation systems have different carbon uptake profiles. There are ways to tune a production forest to have a lot of carbon uptake while allowing you to remove trees for production continuously, even to the extend where managed land is takes up more carbon than unmanaged land. Deserts are technically unmanaged land but they don't store more carbon and similarly a forest will stop being a carbon sink when the trees start decaying or the big trees stop growing while still outcompeting all the smaller, still growing, trees