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But when the trees die, new trees will grow in the same area, sequestering more or less that CO2 that was emitted from the dying tree, no? Would this not turn t
by Ndymium 7y ago
But when the trees die, new trees will grow in the same area, sequestering more or less that CO2 that was emitted from the dying tree, no? Would this not turn the forests into a permanent CO2 sink, at least on a rough scale?
Or do they sequester less than they emit?
- praptak 7y agoOnce the forest grows to maximum height and density, it stops being a sink. It keeps being a storage though, which is still a benefit.
- ulrikrasmussen 7y agoI unfortunately can't find a reference, but I heard that it takes about 20 years for a newly planted tree to peak with regards to absorption of carbon, and after about 100 years it reaches equilibrium where the forest emits about the same amount of carbon to the atmosphere as it absorbs (through decaying matter, fallen trees, and whatnot). It of course depends on the type of tree.
- praptak 7y agoI think it's best to look at this as mass preservation problem. Trees absorb CO2 from air and store in their bodies. Once they die, the CO2 gets released. Since there's a limited tree mass per area unit that the ground can support, once you reach that mass the input and output need to zero out, since there's nowhere to store any additional CO2.
- llebttam 7y agoI'm not an expert in this area, but from what I can tell: Young rapidly growing forests sequester carbon more quickly than mature forests, but mature forests still sequester some carbon, possibly into the soil. (One source https://www.sciencedaily.com/releases/2008/09/080910133934.htm https://www.sciencedaily.com/releases/2008/09/080910133934.h... ) Separately, the regrown forest could be maintained in a state of peak carbon sequestration by doing selective logging from time to time, and as a bonus it would be profitable to do so.