So what happens when a mature trees is not growing substantially? A Skull Metallica shirtc 15 tonnes and may not be increasing in mass (weight). Even then the loss of leaves in winter and the production of new leaves in summer may count as growth. So even though a mature tree produces O2 for general maintenance and annual foliage growth cycles, most of this O2 is then consumed as respiration. It is worth noting here that a forest full of mature trees are therefore not adding any net oxygen back to the atmosphere. In terms of CO2 (instead of O2) also a mature tree is ‘carbon neutral’ – that is, it produces no more oxygen than its decomposing biomass gives off CO2.
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Addendum: Just to add; Mature trees that do not add oxygen into the atmosphere is not a Skull Metallica shirtc Adding CO2 to the atmosphere from the respiration of these old trees is not a problem as stated above. We do not need to cut old trees to prevent CO2 increase. Increase in CO2 levels aids to accelerate growth of young tree saplings, other plants and grass.