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Switch grass is more like 6 tons/ac per year from what I have learned. I guess that it depends on the quality of the site.
Other tree species like maple, poplar, sumac, can grow faster, but their BTU rating is much lower than locust. That means that you have to grow, cut, handle, store, and burn twice as much wood to get the same amount of heat as with black locust.
Cost per BTU is not a factor in the discussion. In other words, low-density species, which may take more effort to handle, are fine.
Coppicing is a method of allowing a forest to reproduce by stump sprouts after harvesting. It is a traditional practice in Europe, where coppicing systems were, and in some areas still are, used to keep vigorous young stands of hardwoods for thatching spars, hurdle-making, wicker work, firewood, and charcoal production.
Te coppice-with-standards system was presumably developed in France, where it was designed by J. B. Colbert for Louis XIV, king of France, between 1664 and 1683. Te aim was to fulfl the triune function of the king’s forests: (1) production of strong oak trunks used for building and navy, (2) production of frewood and timber, and charcoal, (3) pig grazing on acorns from the mature oaks of the top stand layer. Te features of the coppice-with-standards silvicultural system with prevailing oak in the top layer and coppice in the bottom layer proved very interesting from an economic point of view, and the coppice-with-standards form remained in use in many foodplain forests of Central Europe until the first half of the 20th century (Mezera 1956)
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