Quality Classes - The Forestry Forum Woodopedia

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Quality Classes		Mortality of growing stock -Volume of sound wood in live sawtimber and poletimber trees dying annually from natural causes. Natural causes include fire, insect, disease, and animal damage; weather, and suppression. Mortality of sawtimber -Net board-foot volume of sawtimber trees dying annually from natural causes. Net annual growth of growing stock -Annual change in volume of sound wood in live sawtimber and poletimber trees, plus total volume of sound wood in live sawtimber and poletimber trees, plus total volume of trees entering these classes through growth, minus volume losses resulting from natural causes. Net annual growth of sawtimber -Annual change in volume of live sawtimber trees plus total volume of trees reaching sawtimber size, minus volume losses resulting from natural causes.
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