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what exactly is yield class?

Tony Holt TonyH at toneh.demon.co.uk
Thu Aug 20 18:26:50 EST 1998

I understand that (in the UK at least) yield class is the amount of
biomass created per annum - eg. YC12 means 12 cubic metres/year/hectare.
What exactly does this include - is it the total biomass including all
the foliage and/or branches or does it refer to the economically useful

Ps. How much of a tree is ecomically useable as say sawtimber? I realise
this is a broad question, but are there any rules of thumb?
For example, what percentage of an 18 inch white oak might be utilised
as plank/fencing material? 50 per cent or substantially less?
Tony Holt

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