My understanding is that when trees die, the CO2 they store is by default returned to the atmosphere. Does anyone know the mechanism, preferably with a credible source? (Trying to better understand trees as a negative emissions technology.)
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Depends a great deal on what ecosystem you're talking about. Review paper focusing on temperate forests here: https://www.fs.fed.us/nrs/pubs/jrnl/2015/nrs_2015_russell_001.pdf …
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Often overlooked aspect and important part is the volume of water the tree holds
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I'm reasonably confident the answer lies somewhere in Smil's excellent book "The Earth's Biosphere". Worth checking chapters 7 & 8 if you have a copy handy...
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You should've ankified that!
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Some decay bacteria produce methane (CH4), which is a much more potent greenhouse gas. Probably better to burn the dead trees than let them rot.
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It depends what you do with the tree: if you burn the wood, if it disappears in a swamp or if it is stored elsewhere. If you burn it, then obviously O2 is consumed and CO2 produced. You can even make charcoal from it.
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