@4:32 Aaand there it goes wrong... If you just calculate the mass above the ground you get this kind of view. But a clear cut affects on ground storage too. So clear cut CREATES emissions due to carbon release from the ground. It is extremely vital to add what happens in the ground to get real sinks and emissions. Roots, and fungus that works with trees, take lots of carbon in them. And if you have excess carbon in the air the ground behavior changes and it starts to release more carbon. At first you may see more nutrients taken to boost the growth and then carbon cycle is altered. And with clear cut and if done even worse the soil is turned, the carbon is released from ground sinks too. and even more carbon can be adde with fossil fuel made fertilizers that are often added to boost the growth... @5:50 Methane plays minor role, because the water table is not affected. If CO2 cycle goes under water it releases more methane (roughly 50% more due to chemistry change, C2+2O2 = 2 CO2, but C2+2H2O = CH4 + CO2, but this is over simplified version). @8:50 Weird dense regenerated forests. Why not use similar forests where just some trees are taken within 30 year period and every tree on rotation is taken in 120 years? 4 Harvests in a long period of the time. With this model you keep 90+ years old trees in the mix and only 120 years old ones are taken (except making space for trees to grow). And of course regeneration won't work if the forest is not forest but just too dense shrubs. Taken study model does not make sense. Seems like another study made by forest companies that does not want any changes on their clear cut methods.
@4:32 Aaand there it goes wrong... If you just calculate the mass above the ground you get this kind of view. But a clear cut affects on ground storage too.
So clear cut CREATES emissions due to carbon release from the ground.
It is extremely vital to add what happens in the ground to get real sinks and emissions. Roots, and fungus that works with trees, take lots of carbon in them. And if you have excess carbon in the air the ground behavior changes and it starts to release more carbon. At first you may see more nutrients taken to boost the growth and then carbon cycle is altered. And with clear cut and if done even worse the soil is turned, the carbon is released from ground sinks too. and even more carbon can be adde with fossil fuel made fertilizers that are often added to boost the growth...
@5:50 Methane plays minor role, because the water table is not affected. If CO2 cycle goes under water it releases more methane (roughly 50% more due to chemistry change, C2+2O2 = 2 CO2, but C2+2H2O = CH4 + CO2, but this is over simplified version).
@8:50 Weird dense regenerated forests. Why not use similar forests where just some trees are taken within 30 year period and every tree on rotation is taken in 120 years? 4 Harvests in a long period of the time. With this model you keep 90+ years old trees in the mix and only 120 years old ones are taken (except making space for trees to grow). And of course regeneration won't work if the forest is not forest but just too dense shrubs. Taken study model does not make sense. Seems like another study made by forest companies that does not want any changes on their clear cut methods.